text stringlengths 1 1.11k | source dict |
|---|---|
maxwell-equations
Within these constraints there is little room for manoeuvre left, and Maxwell's equations are pretty much the simplest possibility you can find.
We respect (1) by using 4-vector and tensor notation throughout.
We respect (2) by not introducing things like non-linearity, and preferring tensors of low ... | {
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"tags": "maxwell-equations",
"url": null
} |
c++, coordinate-system, type-safety, casting
int main() {
vec<int, 3> a = {{1,2,3}};
vec<float, 3> b = static_vec_cast<float>(a);
}
Season with SFINAE to taste.
However, this still has a major flaw: You're accidentally requiring that To be default-constructible! That's no good (especially if it does happen t... | {
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"tags": "c++, coordinate-system, type-safety, casting",
"url": null
} |
general-relativity, gravity
In certain special cases, you can measure warping in different ways. Relatively recently, one important measurement of warping has been the detection of gravitational waves. Because they are very weak, we don't have to deal with a lot of the headaches that you normally run into in general... | {
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"tags": "general-relativity, gravity",
"url": null
} |
quantum-chemistry, computational-chemistry, theoretical-chemistry
\end{equation}
and leads according to Dunlap [1] to:
\begin{equation}
d_Q^{pq} = \sum_{P} \left(pq|P\right) \left[\pmb{J}^{-1}\right]_{PQ} \quad,
\end{equation}
with
\begin{equation}
\left(pq|P\right) = \int d\pmb{r}_1 \int d\pmb{r}_2 \phi_p(\pmb{r}_1... | {
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"tags": "quantum-chemistry, computational-chemistry, theoretical-chemistry",
"url": nul... |
ngs, blast
Title: Is it OK to use Blast+ to query NCBI's 16s rRNA database with 16s DNA sequences? I have 16S DNA sequences from diversity sequencing, and want to query these against NCBI's 16S rRNA database. If I ultimately want to get taxids for the species that my sequences have, does it make a difference that my ... | {
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"openwebmath_score": null,
"tags": "ngs, blast",
"url": null
} |
vba, excel, subroutine
After
With QualityContWS
LogWorksheet.Range("J" & dataRow) = WorksheetFunction.TextJoin(" ", True, .Range("C89:C91").Value, ". ", Reviewer)
End With
Good thing that these are going to be the only 4 employees who will never leave the company or you may need to rewrite a lot of code in the ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "vba, excel, subroutine",
"url": null
} |
reference-request, type-theory, type-inference
Sometimes written $\vdash a\ :\ ?$ (and called the type inference problem) is decidable, which is to say it doesn't matter whether $a$ is well-typed or not to get an answer. Indeed, all proof checkers based on MLTT implement some version of this decision algorithm!
Obviou... | {
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"tags": "reference-request, type-theory, type-inference",
"url": null
} |
python, python-3.x, reflection
# The function code object (__code__) usage
print_co_obj_fields(my_add.__code__)
Output
co_argcount = 2
co_cellvars = ()
co_code = b'|\x00}\x02|\x01}\x03|\x02|\x03\x17\x00S\x00'
co_consts = (None,)
co_filename = ./source.py
co_firstline... | {
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"openwebmath_score": null,
"tags": "python, python-3.x, reflection",
"url": null
} |
machine-learning, python, random-forest, decision-trees, data-science-model
This tree was a post pruned tree with code as -
best_model2 = DecisionTreeClassifier(
ccp_alpha=0.002, class_weight={0: 0.15, 1: 0.85}, random_state=1
)
best_model2.fit(X_train, y_train) This answer was submitted by the user @Vlad_Z
These ... | {
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"tags": "machine-learning, python, random-forest, decision-trees, data-science-model",
... |
ros
/opt/ros/groovy/include/ros/node_handle.h:448:14: замечание: template<class M, class T> ros::Subscriber ros::NodeHandle::subscribe(const string&, uint32_t, void (T::*)(const boost::shared_ptr<const MReq>&)const, T*, const ros::TransportHints&)
/opt/ros/groovy/include/ros/node_handle.h:498:14: замечание: template<c... | {
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"tags": "ros",
"url": null
} |
javascript, jquery, ajax, jquery-ui
Why are you not using spaces in between operators in your for loops? For example, for(var i=0;i<=len;i++) would become the following: for(var i = 0; i <= len; i++).
Why are you using var custom_autocomplete = function( ... ) { ... } at the top for function declarations, and function... | {
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"tags": "javascript, jquery, ajax, jquery-ui",
"url": null
} |
object-oriented, ruby, role-playing-game
def round_result(opp1, opp2)
puts "Hit points:"
puts "#{opp1.name}: #{opp1.life}"
puts "#{opp2.name}: #{opp2.life}"
end
def attack(attacker, defender)
#this code below is just to prevent stuff like "hit with -27 points of damage"
possible_attack = @powe... | {
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"tags": "object-oriented, ruby, role-playing-game",
"url": null
} |
thermodynamics, gas-laws
$$W = - \Delta U = nC_\mathrm{v}(T_1 - T_2) \tag{1}$$
For ideal monoatomic gas the following is applied:
$$n = \frac{p_1V_1}{RT_1} \tag{1.1}$$
$$C_\mathrm{v} = \frac{3R}{2} \tag{1.2}$$
so that (1) can be rewritten as such:
$$W = nC_\mathrm{v}(T_1 - T_2) = \frac{3p_1V_1R}{2RT_1}(T_1 - T_2) = \f... | {
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"openwebmath_score": null,
"tags": "thermodynamics, gas-laws",
"url": null
} |
distillation
If you continue heating, the liquid will contain more and more B. Its point will stay on the curve "Liquid". The temperature must be higher and higher. The amount of liquid decreases. Simultaneously the composition of the gas which is eliminated contains more and more B. Its composition is always determin... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "distillation",
"url": null
} |
thermodynamics, water, heat-conduction
Pure steam isn't easy to get. Steam dissipates super quick because steam expands a lot. The expansion of steam is the main force that drives steam turbines around the world. In fact, steam so wants to get "up and out" that it's an effective lifting gas. Lifting gas !
Of course g... | {
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"openwebmath_score": null,
"tags": "thermodynamics, water, heat-conduction",
"url": null
} |
c++, performance, matrix, eigen
Title: Multivariate normal density using Woodbury matrix inversion lemma I'm trying to speed up by multivariate normal density function by taking advantage of the fact that the covariance matrix is of the form A + U C U'. The inverse of such a matrix can be calculated using the Woodbury... | {
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"tags": "c++, performance, matrix, eigen",
"url": null
} |
javascript, stackexchange, chat
if(wasPimped(id) == false) {
addToPimped(id);
var groupMessage = "";
var subscribed = getSubscribedUsers();
for(var i = 0; i < subscribed.length; i++) {
groupMessage += ("@" + subscribed[i] + " ");
}
sendMessage(groupMessage);
... | {
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"tags": "javascript, stackexchange, chat",
"url": null
} |
gravity, general-relativity, special-relativity
Suppose the the train has mass M kg and the ball has mass m kg.
From the "fixed" observer's point of view, the initial momentum (in
Newtons) is:
$\rho =50 M-30 m$
and the initial kinetic energy (in Joules) is:
$e=450 m+1250 M$
Let $v_t$ and $v_b$ be the train's a... | {
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"tags": "gravity, general-relativity, special-relativity",
"url": null
} |
Apply[Times, list] is the canonical Mathematica way to represent applying an operation (such as multiplication) to the elements of a list.
Since your question asked about the most efficient way to calculate the product, I will point you to this previous question on Stack Overflow which discussed this issue at length.
... | {
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"lm_q1q2_score": 0.8113346780676374,
"lm_q2_score": 0.8418256492357358,
"openwebmath_perplexity": 999.615017240448,
"openwebmath_score": 0.3931110203266144,
"tags... |
python, python-3.x, postgresql
for row in rows:
yield Row(*row)
def copy_table(src_conn, dst_conn, src_query, dst_table_name, use_named_cursor=False, truncate_table=False):
"""
Run query and import result to another database.
We use null="" in copy_from, because csv library dumps None as ... | {
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"tags": "python, python-3.x, postgresql",
"url": null
} |
ros, cmake, pythonpath
/opt/ros/kinetic/share/catkin/cmake/catkinConfig.cmake:20 (include)
CMakeLists.txt:52 (find_package)
-- Configuring incomplete, errors occurred!
See also "/home/riddhi/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/riddhi/catkin_ws/build/CMakeFiles/CMakeError.log".
Invoking "cmake"... | {
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"tags": "ros, cmake, pythonpath",
"url": null
} |
c#, game, tetris
I ended up writing a lot of array manipulation functions, such as FillCharArrayWithChar() and Copy2DCharArray(). Perhaps there are native methods for these already in the C# libraries.
In the past, it has been suggested that I not use if x == true and if x == false. I find it increases code readabilit... | {
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"tags": "c#, game, tetris",
"url": null
} |
ros, rviz, jetson-tk1
GL_ARB_point_sprite GL_ARB_program_interface_query GL_ARB_provoking_vertex GL_ARB_robust_buffer_access_behavior GL_ARB_robustness GL_ARB_sample_shading GL_ARB_sampler_objects GL_ARB_seamless_cube_map GL_ARB_seamless_cubemap_per_texture GL_ARB_separate_shader_objects GL_ARB_shader_atomic_counters ... | {
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"tags": "ros, rviz, jetson-tk1",
"url": null
} |
This tells us something we might not have guessed about multiple regression: for a given sample size $n$, and assuming no regressors have a genuine relationship with $Y$, the $R^2$ for a model using $k-1$ regressors plus an intercept has the same distribution as $1 - R^2$ does for a model with $k-1$ residual degrees of... | {
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"lm_q1_score": 0.981735725388777,
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"lm_q2_score": 0.8633916117313211,
"openwebmath_perplexity": 578.4726344361237,
"openwebmath_score": 0.8257148861885071,
"tags... |
java, covid-19
Title: Exponential growth calculator for COVID-19 I've been listening to some programmers and they use terms like good and bad code. I am not really sure what they mean by that. I mean I went on r/badcode and saw some stuff I knew was definitely bad code. But I don't really understand if bad code is rep... | {
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"tags": "java, covid-19",
"url": null
} |
python, beginner
# Prints the output in the Python window for QA purposes#
print(errdisabled)
# Disconnects from the SSH session#
ssh.disconnect()
# Sets up the new window once the button is clicked#
output = Toplevel(root)
output.title("Output Window")
output.... | {
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exist methods for reducing of canceling the effect due to random variation. Also, in a Simple Moving Average, the oldest price data are removed from the Moving Average as a new price is added to the computation. Here time series derived from the average of … extrapolate a local trend. FunkyTunes has revenue in January ... | {
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"lm_q1_score": 0.9664104953173166,
"lm_q1q2_score": 0.8447174169513181,
"lm_q2_score": 0.8740772384450967,
"openwebmath_perplexity": 1510.8730050310744,
"openwebmath_score": 0.5109207630157471,
"t... |
co.combinatorics, linear-algebra, coding-theory
Title: Boolean error correcting code over $\mathbb{F}_q$ Is there any known construction of a linear error correcting code $\mathsf{ECC}:\mathbb{F}_q^n \to \mathbb{F}_q^m$ (with reasonable parameters), such that when given a Boolean vector $v\in \{0,1\}^n$, it also retur... | {
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"tags": "co.combinatorics, linear-algebra, coding-theory",
"url": null
} |
order is no longer considered. notebook Stat day 1 notes December 09, 2014 Apple has come out with two new products recently, the iPhone 6 and the iPhone 6+. Category Questions section with detailed description, explanation will help you to master the topic. Hint: Line up the 36 students and then determine how. Combina... | {
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"lm_q1q2_score": 0.8437199397400613,
"lm_q2_score": 0.8596637451167997,
"openwebmath_perplexity": 971.650366932591,
"openwebmath_score": 0.5433921813964844,
"tags":... |
thermal-radiation
This is the part that is confusing you. The body (cavity walls) has different-than-blackbody spectrum of thermal emission when exposed to open space (thus not in equilibrium). But when this radiation is released into cavity where it cannot escape, after some time, when equilibrium is reached, total E... | {
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"id": 75708,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermal-radiation",
"url": null
} |
ros, ros-melodic, std-msgs, msg, rosserial
I noticed the latter can be accessed by my_data.someVariable.data where the first needs to be accessed by my_data.someVariable | {
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"tags": "ros, ros-melodic, std-msgs, msg, rosserial",
"url": null
} |
gravity, magnetic-fields
Title: Is gravitomagnetism a thing or just an analogy to explain why object precess near massive object? I browsed a couple of articles treating gravity like a bar magnet, explaining how object can precess in the vicinity of gravity well using analogy of motion of charged particle in magnetic ... | {
"domain": "physics.stackexchange",
"id": 63022,
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"tags": "gravity, magnetic-fields",
"url": null
} |
University Consider the linear, second order, homogeneous, ordinary dif- ferential equation a t. Each side is a proper vector equation this can be understood in the domain., 23:40 to cite OCW as the source dif- ferential equation a ( t ) d2y dt2 to being by. Variable with respect to one independent variable is called a... | {
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"lm_q1_score": 0.9802808736209154,
"lm_q1q2_score": 0.8585172372784825,
"lm_q2_score": 0.8757869916479466,
"openwebmath_perplexity": 1542.8762189377894,
"openwebmath_score": 0.2998172640800476,
"tags":... |
neutrinos
Thus my question is : let's consider a given flavor neutrino produced, that flight to a long distant that is known with an extremely good precision. Let's suppose that in the detector, it will interact (I know that cross-section is low) and transform to a charged lepton.
Will the flavor of the neutrino at th... | {
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"openwebmath_score": null,
"tags": "neutrinos",
"url": null
} |
cosmology, time, space-expansion, universe, big-bang
Title: Deriving the age of the universe I am trying to work out the solution to exercise 8.4 from An Introduction to Modern Cosmology by Andrew Liddle. I could derive the Friedmann equation as below,
$$\dot{a}^2 = H_0^2 \left[\Omega_0a^{-1} + (1 - \Omega_0)a^2\right... | {
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"tags": "cosmology, time, space-expansion, universe, big-bang",
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} |
# If $A$ and $B$ are matrices such that $AB^2=BA$ and $A^4=I$ then find $B^{16}$.
If $$A$$ and $$B$$ are matrices such that $$AB^2=BA$$ and $$A^4=I$$, then find $$B^{16}$$.
My Method:
Given $$AB^2=BA \tag{1}$$ Post multiplying with $$B^2$$ we get
$$AB^4=BAB^2=B^2A$$ Hence
$$AB^4=B^2A$$ Pre Multiplying with $$A$$ a... | {
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"lm_q2_score": 0.8289388040954683,
"openwebmath_perplexity": 264.6731588397175,
"openwebmath_score": 0.8071836233139038,
"tag... |
# Why isn't $H^*(\mathbb{R}P^\infty,\mathbb{F}_2)\cong \mathbb{F}_2[[x]]$?
We just computed in class a few days ago that $$H^*(\mathbb{R}P^n,\mathbb{F}_2)\cong\mathbb{F}_2[x]/(x^{n+1}),$$ and it was mentioned that $H^*(\mathbb{R}P^\infty,\mathbb{F}_2)\cong \mathbb{F}_2[x]$, but I (optimistically?) assumed that the coh... | {
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"tags"... |
## 1 Answer
The differentiation operator is noncontinuous (not bounded) on the space $\Bbb R[x]$ of all polynomials with $\sup$ norm over $[-1,1]$.
• Can I use a sequence like $f_n(x)=x^n$ to show unboundedness? Jun 11 '18 at 16:56
• Yes. Or, alternatively, $\frac{x^n}n\, \to0$ while its image $x^{n-1}$ doesn't tend ... | {
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"openwebmath_score": 0.8513213396072388,
"tag... |
standard-model, group-theory, group-representations, lie-algebra, grand-unification
In GUT theories, the off-diagonal blocks of the adjoint become hugely massive particles because of some GUT symmetry breaking. These $(3,2)$ states cause proton decay so they better be very heavy. We can't compare them with any known p... | {
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"tags": "standard-model, group-theory, group-representations, lie-algebra, grand-unification... |
quantum-mechanics, hilbert-space, wavefunction, probability
Now, let $\mu^Q, \mu^P$ be the projection-valued measures associated with $Q, P$ from the spectral theorem. If $I_1, I_2\subseteq \Bbb{R}$ are any intervals, then in general, when $Q, P$ don't commute, the projections $\mu^Q(I_1), \mu^P(I_2)$ don't commute ei... | {
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"tags": "quantum-mechanics, hilbert-space, wavefunction, probability",
"url": null
} |
min $$2(t_1+t_2)+\dots$$
or the coefficient can be negative if you are maximizing, as in
max $$-2(t_1+t_2)+\dots$$
Otherwise, you end up with an unbounded objective function, and the problem must be solved by other methods, e.g. mixed integer-linear programming.
(If I knew this before, I had forgotten. Thanks to Di... | {
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"openwebmath_score": 0.9193260669708252,
"tags"... |
schroedinger-equation, integration, eigenvalue, molecules, vibrations
Title: Problem with the Cooley-Numerov Method for Solving the Radial Nuclear Schodinger Equation in the Born-Oppenheimer Approximation I have been trying to implement a solver for the radial nuclear Schodinger equation in the Born-Oppenheimer approx... | {
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"openwebmath_score": null,
"tags": "schroedinger-equation, integration, eigenvalue, molecules, vibrations",
"url": n... |
mechanical-engineering, electrical-engineering, motors, bearings, electric-vehicles
I wonder if the cart will slowly steer unwantedly to the left and right, since only one motor is attached to only one wheel?
P/S: I can't have two motors at two wheels because if both are not completely in sync (which is hard to achiev... | {
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"tags": "mechanical-engineering, electrical-engineering, motors, bearings, electric-vehi... |
quantum-mechanics, general-relativity, quantum-entanglement, space, non-locality
Finally, let me remark that "non-locality" is not a feature of quantum mechanics itself, but of its interpretations. Bell's theorem tell us that we must either give up locality or realism (although we may choose to give up both), and acco... | {
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"tags": "quantum-mechanics, general-relativity, quantum-entanglement, space, non-locality",... |
– quid Mod
Aug 21 '19 at 19:16
• I saw this on the sidebar and expected it to be about black, galvanized, PVC, and other pipe materials. Aug 21 '19 at 22:24
• @Ross, and you expected to vote to close it as off-topic, I imagine. Aug 22 '19 at 0:54
• Aside from the main question of which pipe to use, rather than |-2| for... | {
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"lm_q1q2_score": 0.8590196231707222,
"lm_q2_score": 0.8918110418436166,
"openwebmath_perplexity": 1202.2073976976133,
"openwebmath_score": 0.8581776022911072,
"ta... |
newtonian-mechanics, newtonian-gravity, orbital-motion, satellites
Title: Is it really necessary for the orbital plane of a satellite to pass through the center of mass of the object around which it's orbiting? Is it really necessary for the orbital plane of a satellite to pass through the center of mass of the celest... | {
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"tags": "newtonian-mechanics, newtonian-gravity, orbital-motion, satellites",
"url": null... |
hamiltonian-simulation, pauli-gates
I hope and I am interested to see an answer that will use Adiabatic state preparation algorithm for the same job. | {
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Conversely, for any $$m$$, $$\mathbb{C}^m$$ is a $$2m$$-dimensional real vector space, and multiplication by $$i$$ is an $$\mathbb{R}$$-linear map whose square is $$-1$$. So such a matrix does exist whenever $$n$$ is even. Explicitly, this is just the obvious generalization of your $$4\times 4$$ matrix, a block diagona... | {
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"lm_q2_score": 0.8499711718571775,
"openwebmath_perplexity": 164.10184065307018,
"openwebmath_score": 0.9290564060211182,
"ta... |
ros, navigation, ros-melodic, turtlebot2, turtlebot
Originally posted by distro with karma: 167 on 2022-09-10
This answer was ACCEPTED on the original site
Post score: 0 | {
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"tags": "ros, navigation, ros-melodic, turtlebot2, turtlebot",
"url": null
} |
gazebo
Originally posted by Arn-O with karma: 316 on 2013-10-09
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by nkoenig on 2013-10-09:
If inertia values are too small, especially when connected to links that have a much large inertia, then simulation will have unexpected resul... | {
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"tags": "gazebo",
"url": null
} |
computer-architecture, security, error-estimation, reliability
Critical systems development can't be that sloppy. Every element is tested thoroughly, ever combination of elements is further tested. A lot of very bright people are paid a lot of money to find new ways to torture your code to make it break down and produ... | {
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"tags": "computer-architecture, security, error-estimation, reliability",
"url": null
} |
bash, linux
fn_help_message() {
echo Usage: rdoc \<options\> [argument]
echo
echo Available options:
echo " -h Display this help message. "
echo " -g Generate new configuration files. ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "bash, linux",
"url": null
} |
java, socket, stream, network-file-transfer, aes
Title: Sending a file over a socket with AES encryption I'm not sure what's the best way to deal with streams that need to be closed whenever I'm done using them? Usually the need to also catch the exception inside the finally statement is very, very annoying. Am I doin... | {
"domain": "codereview.stackexchange",
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, socket, stream, network-file-transfer, aes",
"url": null
} |
Consider the following system of equations:
$\begin{array}{l}\mathrm{sin}\left(x\right)\text{}+\mathrm{cos}\left(y\right)=\frac{4}{5}\\ \mathrm{sin}\left(x\right)\mathrm{cos}\left(y\right)=\frac{1}{10}\end{array}$
Visualize the system of equations using ezplot. To set the x-axis and y-axis values in terms of pi, get... | {
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"lm_q2_score": 0.8688267762381844,
"openwebmath_perplexity": 922.9804206597966,
"openwebmath_score": 0.5450394749641418,
"tags": ... |
homework-and-exercises, energy, energy-conservation, harmonic-oscillator, oscillators
Title: Difficulty figuring out how to calculate the angular frequency I've been tasked with finding the angular frequency for a oscillating mass on a supposed friction-less surface. I've been told that the mass is pulled to the left ... | {
"domain": "physics.stackexchange",
"id": 32928,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, energy, energy-conservation, harmonic-oscillator, oscillat... |
php, classes, logging
Title: Logger class for MVC Framework I have created a logger class for my own framework. Now I am trying to identify the components which can be done in a better way. The logger class doesn't log anything inside a file but it logs the files that are getting loaded (say controller, model, etc.) a... | {
"domain": "codereview.stackexchange",
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, classes, logging",
"url": null
} |
python, pandas
stocky_b = set(chunk.id.unique().tolist())
for stock in stocky_b:
for day, ab in zip( days, au_bound ):
stock_chunk=chunk_clean[(chunk_clean['id']==stock) & (chunk_clean['date']==day)]
#time between trades subtraction
stock_chunk.loc[:,'t_b_trades']=sto... | {
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"openwebmath_perplexity": null,
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"tags": "python, pandas",
"url": null
} |
java, unit-testing
Title: Simple function in Java This is a JUnit asserts for this function:
assertEquals(0, obj.generateListSize(0));
assertEquals(1, obj.generateListSize(1));
assertEquals(1, obj.generateListSize(2));
assertEquals(3, obj.generateListSize(3));
assertEquals(3, obj.generateListSize(... | {
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"tags": "java, unit-testing",
"url": null
} |
gazebo, simulation, simulator-gazebo, param-server, sensor
<imageFormat>R8G8B8</imageFormat>
<hfov>90</hfov>
<nearClip>0.01</nearClip>
<farClip>100</farClip>
<updateRate>20.0</updateRate>
<controller:gazebo_ros_camera name="finger_tip_camera_controller" plugin="libgazebo_ros_cam... | {
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"tags": "gazebo, simulation, simulator-gazebo, param-server, sensor",
"url": null
} |
astronomy, simulations, coordinate-systems, observational-astronomy
How do I determine the radians to rotate the earth to show an ECI positions for a time to be the same location on the rotated globe ( in terms of latitude and longitude )? That is, how do I calculate for any UTC time in a day, how much to rotate the e... | {
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"tags": "astronomy, simulations, coordinate-systems, observational-astronomy",
"url": nul... |
newtonian-mechanics, forces, momentum, collision
Title: The time-average force of ball undergoing collision between walls Why do we take the time between collisions e.g time of ball in air during collision between two walls to find time-average force like in the following question:
A “superball” of mass $m$ bounces b... | {
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"tags": "newtonian-mechanics, forces, momentum, collision",
"url": null
} |
organic-chemistry, molecular-orbital-theory, pericyclic, stereoselectivity
Steric effects
In certain Diels-Alder reactions, especially those involving the cyclopentadiene, steric effects have been proposed.
[5]
Experimental data shows that when $\ce{R}$ = $\ce{CH3}$ and $\ce{X}$ = $\ce{CHO}$ the endo product is form... | {
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"tags": "organic-chemistry, molecular-orbital-theory, pericyclic, stereoselectivity",
"... |
solid-state-physics, scattering, diffraction, x-ray-crystallography, braggs-law
Remember that there are three sums in Equation 2.38. For simplicity we only evaluated one sum to calculate the intensity in Equation 2.39. The total intensity equals:
$$I \propto \dfrac{\sin^2 \left( \dfrac{1}{2} M \mathbf{a}_1 \cdot \Delt... | {
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"tags": "solid-state-physics, scattering, diffraction, x-ray-crystallography, braggs-law",
... |
electromagnetism, energy, electromagnetic-radiation, electric-fields, wave-particle-duality
"Kushagra Singh:
~so you mean $∫ (1/2)εE^2 dV$ in the entire volume of rays propagation is $nhf$
ChatGPT:~ No, that's not what I meant. The equation $∫ (1/2)εE^2 dV$ represents the total energy of the electromagnetic wave over ... | {
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"tags": "electromagnetism, energy, electromagnetic-radiation, electric-fields, wave-particl... |
java
for (ValidacaoResultado validacao : validacoes) {
BasicDBObject dbObject = new BasicDBObject();
BasicDBObject atributos = validacao.getArquivo();
if (validacao.getArquivo() != null && "NOK".equals(validacao.getResultadoConsolidado())) {
dbObject.append("id", Uti... | {
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"tags": "java",
"url": null
} |
rust
None of this review is meant to convince you not to use unsafe. If you really do need that maybe-two-cycles of performance that you might save from skipping the checks, you should use unsafe pretty much like this. But don't waste your time eliminating a couple of checks that might not even be in the compiled code... | {
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you are currently navigating in are currently navigating in intersecting the origin of!, between the two lines intersect in a plane using the coordinate points currently... To find the angle between two points: Latitude Longitude perpendicular if the product of their is., ø = 90° Thus, the lines are parallel if their s... | {
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"lm_q1q2_score": 0.8234861589752188,
"lm_q2_score": 0.8479677564567913,
"openwebmath_perplexity": 594.9239166871614,
"openwebmath_score": 0.7480207085609436,
"tags"... |
java, caesar-cipher
Title: Java implementation of the caesar-cipher I've wrote a little program that encrypts text by using the caesar-cipher.
Also it contains a little GUI, created by using swing.
Here's the full code:
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
impo... | {
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"tags": "java, caesar-cipher",
"url": null
} |
classification, data-analysis
It does not seem like your dataset contains this information so I am afraid you will be unable to create a model.
I would recommend to start with a different problem that has a better dataset available and is easier to crack for a beginner. The IRIS dataset is a wellknown beginner ML prob... | {
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"tags": "classification, data-analysis",
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} |
javascript, mathematics
// Declaring variables used in equation
var totalHeight = (truckHeight / boxHeight) | 0;
var totalWidth = (truckWidth / boxWidth) | 0;
var totalLength = (truckLength / boxLength) | 0;
// Calculations
var boxNumber = totalHeight * totalWidth * totalLength;
// Output answer
if (boxNumber = 1)
... | {
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"id": 7667,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, mathematics",
"url": null
} |
water, volume, condensation, humidity
Title: How to calculate the volume of water in a certain amount of air, given the relative humidity? If, according to the weather forecast, the current humidity is 90%, how can I calculate the volume of water that could be extracted from a certain volume of that air? You need a ps... | {
"domain": "physics.stackexchange",
"id": 17598,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "water, volume, condensation, humidity",
"url": null
} |
java, android, json
public int setQuestion_id(int i) {
try {this.question_id = this.json.getJSONObject(i).getInt("id");}
catch (JSONException e) {e.printStackTrace();}
return question_id;
}
public String setQuestion_txt(int i) {
try {this.question_txt=this.json.getJSONObject(i).getString("Question");... | {
"domain": "codereview.stackexchange",
"id": 36139,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, android, json",
"url": null
} |
heat, temperature, thermal-conductivity
Title: Is this a simple system in which no heat transfer is possible? Let's say that a hot gas is trapped in a metal box. This metal box is magnetically suspended in another structure with a low temperature. The inner box does not touch anything. And there is a void in the struc... | {
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"tags": "heat, temperature, thermal-conductivity",
"url": null
} |
that Venn diagrams use overlapping shapes (usually circles) to show relationships. So here we are explaining the concept of Syllogism with some examples by using some simple rules. Solve Problems Involving Profit and Loss (8) Solve Problems Involving Simple Interest (9) Solve Problems Involving Compound Interest (10) S... | {
"domain": "trattoriaborgo.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9755769149165089,
"lm_q1q2_score": 0.8043260204966841,
"lm_q2_score": 0.8244619242200082,
"openwebmath_perplexity": 950.9216751790317,
"openwebmath_score": 0.3991427719593048,
... |
c#, performance, .net, concurrency
return result.Value;
},
(k, v) =>
{
if (v == null)
result = Result.Delayed;
else
result = tryUpdate(ref v) ?
... | {
"domain": "codereview.stackexchange",
"id": 20194,
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"openwebmath_score": null,
"tags": "c#, performance, .net, concurrency",
"url": null
} |
introduced since v10 is able to take care of heat flux continuity automatically, as long as the form of the equation is proper. The above equation is the Bernoulli's equation. We have already seen the derivation of continuity equation for compressible fluid flow in our previous post. •Conservation of mass of the fluid.... | {
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"lm_q1q2_score": 0.8092657637192371,
"lm_q2_score": 0.8333246035907933,
"openwebmath_perplexity": 507.58152442686884,
"openwebmath_score": 0.7993223071098328,
"... |
java, game
public int getX()
{
return x;
}
public int getY()
{
return y;
}
public int getWidth()
{
return width;
}
public int getHeight()
{
return height;
}
public int getSpeed()
{
return speed;
}
public Image getImage()
{
return entityImage;
}
/**
* Creates a rectangle for the entity
*... | {
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"id": 2988,
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"openwebmath_score": null,
"tags": "java, game",
"url": null
} |
urdf, xml, transform
Originally posted by dornhege with karma: 31395 on 2012-12-20
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by ChengXiang on 2012-12-20:
Hi. The gazebo is sending out the /joint_states msg. But it seems that the joint I defined is not included in the name. | {
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"tags": "urdf, xml, transform",
"url": null
} |
python, performance, python-3.x, file
Putting them in functions will help in both ways. But as you put them in functions, be sure to consider what interface you should make available. Should the function know the filename, or should it be passed the open file object? Should it know what to do with coincident events, o... | {
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"openwebmath_score": null,
"tags": "python, performance, python-3.x, file",
"url": null
} |
java, rags-to-riches
Title: Needle in a Haystack This is a rags-to-riches of some recent "search word in multiple files" questions, such as this deleted question and this.
The idea here is to do a case-insensitive word (complete, not partial) search that can also report the line and 'column' number of the search resul... | {
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"openwebmath_score": null,
"tags": "java, rags-to-riches",
"url": null
} |
matlab, filters, infinite-impulse-response
$$
which is typically called an $N^{th}$ order LCCDE.
However, when there happens a need for implementing the IIR filter using time domain convolution instead;
$$
y[n] = h[n] \star x[n]
$$
then this requires the practical availability of the impulse response $h[n]$ of the II... | {
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"openwebmath_score": null,
"tags": "matlab, filters, infinite-impulse-response",
"url": null
} |
Now multiply that by 2: the perimeter is $\frac{6x^2- 8x- 2}{x^2- 1}$, exactly what you have.
What numbers did you try? If we take x= 3, the side given is (3-2)(3+1)= 1/4 and the area is (18- 21+ 6)/(9-1)= 3/8 so the other side is (3/8)(4/1)= 3/2. Then the perimeter is 3/2+ 1/4+ 3/2+ 1/4= (6+ 1+ 6+ 1)/4= 14/4= 7/2, wh... | {
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"id": null,
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"lm_q2_score": 0.8152324938410783,
"openwebmath_perplexity": 298.99716438170066,
"openwebmath_score": 0.9169607162475586,
"ta... |
javascript, reinventing-the-wheel, stack
myStack.printStack()
console.log(myStack.isEmpty()) You have a bug in your constructor:
constructor(data=null) {
this.items = [data]
this.length = 0
}
If you pass an item and then push to the stack, you lose the first item:
let myStack = new Stack("123");
myStack.pu... | {
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"tags": "javascript, reinventing-the-wheel, stack",
"url": null
} |
algorithms, trees, balanced-search-trees
Title: Prove that given a number we can find whether there're 2 elements in a red/black tree that their sum equals that number in $\Theta(n)$ time
Prove that given a number we can find whether there're 2 elements in a red/black tree that their sum equals that number in $\Theta... | {
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"tags": "algorithms, trees, balanced-search-trees",
"url": null
} |
everyday-chemistry, carbon-family
I tried all usual products (the ones to clean the stove, vinegar, then sodium bicarbonate left for some time, gentle mechanical prying, ...) but it is stuck.
Is there a way to dissolve carbon (burned organic substance) using a reasonably available substance? (say, HClO3 would be doabl... | {
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"tags": "everyday-chemistry, carbon-family",
"url": null
} |
Home Misc Find the first N prime numbers. (Method 4) [Sieve of Eratosthenes]
# Find the first N prime numbers. (Method 4) [Sieve of Eratosthenes]
0 comment
Question: Given an integer N, find the prime numbers in that range from 1 to N.
Input: N = 25
Output: 2, 3, 5, 7, 11, 13, 17, 19, 23
We have several ways of fi... | {
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"lm_q2_score": 0.8577680977182186,
"openwebmath_perplexity": 3963.036829112114,
"openwebmath_score": 0.2162545919418335,
"ta... |
c++, performance, matrix
int main()
{
Matrix m1 = Matrix(3,3);
Matrix m2 = Matrix(3,3);
Matrix m3 = Matrix(3,3);
dot(m1, m2, m3);
return 0;
} Both of the other answers make some very good points, especially when it comes to replacing vector. Two dimensional vectors are particularly iffy because t... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, performance, matrix",
"url": null
} |
c#
return "."
}
private static bool IsPrintableCharacter(byte b) => b > 32;
Now let's think...you're working with ASCII and byte is in range [0...255] then you may directly cast it to char (after leave to representation issues you mentioned in your Console codepage settings), you avoid to create so many strings and ... | {
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"tags": "c#",
"url": null
} |
as the OP found. Whether the recursive formula can be simplified to an explicit closed formula I'll leave to someone else.
Here is the complete solution, using the excellent recurrence of Barry Cipra.
Consider the $$k$$-bit-long binary representation of $$N = b_1 b_2 b_3 \dots b_k$$ where $$b_1$$ is the most signific... | {
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"lm_q2_score": 0.8856314632529871,
"openwebmath_perplexity": 707.3348650020821,
"openwebmath_score": 0.9603107571601868,
"tags... |
special-relativity, differential-geometry, metric-tensor, group-theory
Since in a global inertial coordinate system you have to have the Minkowski metric by definition, only those transformations (diffeomorphisms) which preserve the Minkowski metric turn one inertial coordinate system into another. You can then easily... | {
"domain": "physics.stackexchange",
"id": 31174,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "special-relativity, differential-geometry, metric-tensor, group-theory",
"url": ... |
ros-indigo
Not sure what is wrong.
Possible problem:
patrolling_sim is not tested and released on Indigo?
compatibility of stage version?
Thank you.
Originally posted by chenhuanfa on ROS Answers with karma: 13 on 2015-01-20
Post score: 1
Hello Huanfa!
I'm sorry for this. Unfortunately, the patrolling_sim pkg ver... | {
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"tags": "ros-indigo",
"url": null
} |
catkin, cmake, roscpp, ros-noetic
cl-roscpp-msg/focal,focal 1.14.3+ds1-11ubuntu5 all
libroscpp-core-dev/focal 0.6.13-1build1 amd64
libroscpp-dev/focal 1.14.3+ds1-11ubuntu5 amd64
libroscpp-msg-dev/focal 1.14.3+ds1-11ubuntu5 amd64
libroscpp-serialization0d/focal 0.6.13-1build1 amd64
libroscpp2d/focal 1.14.3+ds1-11ubuntu... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "catkin, cmake, roscpp, ros-noetic",
"url": null
} |
inorganic-chemistry, acid-base, redox, aqueous-solution, transition-metals
Anhydrous ferrous chloride is described as green to yellow, and the dehydrate and tetra hydrate are green to blue-green (CRC Handbook).
Now color is broad and continuous (see the visible spectrum),
not digital, like how many fingers am I hold... | {
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"tags": "inorganic-chemistry, acid-base, redox, aqueous-solution, transition-metals",
"... |
machine-learning, confusion-matrix
The recall is the ratio tp / (tp + fn) where tp is the number
of true positives and fn the number of false negatives
If you go down to where they define micro, it says
'micro': Calculate metrics globally by counting the
total true positives, false nega... | {
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"id": 3219,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "machine-learning, confusion-matrix",
"url": null
} |
the normal distribution has a kurtosis of eruption duration distribution is or. The distribution looks that describes the tail of a distribution can be classified as leptokurtic, mesokurtic and.. … this definition of kurtosis algorithm the package is not bell-shaped or light-tailed ) kurtosis r tutorial the normal woul... | {
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"lm_q1_score": 0.9728307661011975,
"lm_q1q2_score": 0.8169190390917828,
"lm_q2_score": 0.8397339676722393,
"openwebmath_perplexity": 1378.188950212491,
"openwebmath_score": 0.7699798345565796,
"tags": n... |
electromagnetism, electricity, electrons, atoms, voltage
When magnetic field cross atoms, if magnet's north side (+) is near to this atom the center of electron's path (gray circle) will not be on the center of nuclear, it will move toward magnet, because magnet has north side (+) and electron has (-) potential. As I ... | {
"domain": "physics.stackexchange",
"id": 7045,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, electricity, electrons, atoms, voltage",
"url": null
} |
c#, beginner, game, community-challenge, rock-paper-scissors
/// <summary>
/// Parses the Input for an Integer between the lower and upper bounds
/// </summary>
/// <returns>
/// null or integer
/// </returns>
/// <param name='str'>
/// String to be parsed for an... | {
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"tags": "c#, beginner, game, community-challenge, rock-paper-scissors",
"url": null
} |
java, io
} else {
System.out.println("Please enter y or n");
}
}
System.out.println("The end");
}
}
class Citizens
import java.util.Scanner;
public class Citizens {
private String name;
private int age;
private String adress;
String answer;
public int answ... | {
"domain": "codereview.stackexchange",
"id": 16957,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "java, io",
"url": null
} |
graph-theory, graph-algorithms, planar-graphs, partition-problem, delaunay-triangulation
I'm at a point where I'm stuck, so any help with this problem would be lovely. If you can flat out solve this problem, you're the bees knees. Otherwise, if you know of any papers or textbooks or algorithms you could point me to, I... | {
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"openwebmath_score": null,
"tags": "graph-theory, graph-algorithms, planar-graphs, partition-problem, delaunay-triangu... |
python, beginner, python-3.x, programming-challenge, comparative-review
def largestproduct(adjdigit):
x=0
y=adjdigit
z=str(number)[x:y]
product=1
count=0
control=0
while y<=1000:
for i in z:
if count==adjdigit:
if product>control:
cont... | {
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"openwebmath_score": null,
"tags": "python, beginner, python-3.x, programming-challenge, comparative-review",
"ur... |
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