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ros, quadcopter, tf2, ros-electric, transform-listener Title: Reading the sequence number from a transform Hi folks! I'd like to be able to use the sequence number from a transform that I am getting from a motion capture vrpn. I use this piece of code to read the transform: tf_listener.lookupTransform("/optitrak", "/...
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interference, home-experiment The great thing about this arrangement is that the amplitudes of the two reflexions are almost identical, which means you get highly visible fringes (the nulls go almost completely dark). Here's an image from a 3cm x 1cm #1 coverslip taken with a 532nm semiconductor laser. My screen was ...
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java, performance, algorithm, programming-challenge {8,5,3} satisfy both conditions s[8] = 'a', s[5] = 'b' and s[3] = 'c' (5 + 1)² = (8 + 1)(3 + 1) We find 2 triples that match the 2 conditions so the answer is 2. The code gist link = https://gist.github.com/JulienRouse/cafbce417bbc2a4f6303df10df20d445 Code here: /...
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rust, numerical-methods for i in 1..NT { // RK4 scheme k1 = g[i-1]; l1 = -f[i-1]; k2 = k1 + l1*dt/2.0; l2 = l1 - k1*dt/2.0; k3 = k1 + l2*dt/2.0; l3 = l1 - k2*dt/2.0; k4 = k1 + l3*dt; l4 = l1 - k3*dt; // next values f[i] = -l1 + (k1...
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turing-machines, dc.distributed-comp Title: Distributed Turing Machine? I'm a master student focused on distributed systems but also interested on theoretical computer science. I was wondering if there is a formal representation of a distributed system on top of a turing machine? That is, is it possible to extend (mak...
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Ejm1197 in Mathematics. Use x as your variable. How to use The … Continue reading →. Double integrals in polar coordinates The area element is one piece of a double integral, the other piece is the limits of integration which describe the region being integrated over. Line integrals We have now met an entirely new kind...
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the time constants. The period T is the time for one cycle. The vibration (current) returns to equilibrium in the minimum time and there is just enough damping to prevent oscillation. 2% of the starting value. damped harmonic motion, where the damping force is proportional to the velocity, which is a realistic damping ...
{ "domain": "gremium-franconia.de", "id": null, "lm_label": "1. YES\n2. YES", "lm_name": "Qwen/Qwen-72B", "lm_q1_score": 0.9820137868795702, "lm_q1q2_score": 0.8140293382511515, "lm_q2_score": 0.8289388083214156, "openwebmath_perplexity": 760.3194788120288, "openwebmath_score": 0.795654296875, "tags...
algorithm, programming-challenge, rust Ok(()) } src/bin/day_1_2.rs use { anyhow::{anyhow, Result}, aoc_2020::day_1::{self as lib, Number}, std::{fs::File, io::BufReader}, }; const PATH: &str = "./data/day_1/input"; const SUM: Number = 2020; fn main() -> Result<()> { let file = BufReader::new(File::o...
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javascript, php, security, session $statement = mysqli_stmt_init($connection) or die($error_message); if (mysqli_stmt_prepare($statement, "SELECT id, account_name, password FROM user WHERE account_name=? OR email=?;")) { mysqli_stmt_bind_param($statement, "ss", $inserted_id, $inserted_id); ...
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ros, python, gui if __name__ == "__main__": main() Problem: Now I want to make this GUI function with ROS2. I understand that I will have to create a class for my ROS2 Node (I would like the Window class to be my ROS2 node). I would also like to set up a subscriber in the constructor of the ROS2 Node, let us say ...
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homework-and-exercises, newtonian-mechanics, forces, drag, rocket-science The follow steps will be as follows, such that we arrive at the equation $\Delta u=V_{eq}ln(\frac{M_0}{M})$, same as what you have gotten, only that $v_{eq}$ is different now.
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H0 that all tables are conserved in distributions. However, these tests answer distinct alternative hypotheses. ### 1. The comparative chi-squared test Alternative hypothesis H1: Patterns represented by the tables are differential. The statistical foundation of this test is first established in and the test is then ext...
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google-apps-script, google-sheets // Part 2 of the code. Read and split the data into formats ready for the 3 different sheets. for (i=1;i<values.length;i++){ // The if statement is a duplicate check. It checks if the "Done" column is empty. If it is, it then gets data. if(values[i][done-1] == ""){ // The var name ...
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analytical-chemistry Title: Why does insufficient data lead to random errors? I've read up on the causes of random error and noticed insufficient data to be one of the causes of random error. However, I'm confused as to why insufficient data could possibly lead to random errors. Could someone provide some context for...
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ros, slam, navigation, rgbd6dslam, rgbd-slam Title: Can I do RGBD-6D-SLAM on an empty room? As I know RGBD-6D-SLAM uses surf feature to do the job, what if the room I'm going to reconstruct is empty and thus featureless. Can RGBD-6D-SLAM still able to reconstruct it ? Thank! Originally posted by Benzwr on ROS Answer...
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newtonian-mechanics, forces, kinematics, free-body-diagram, centripetal-force Title: Centripetal force and change of the tangential velocity I'm studying physics in the fifths semester and I'm still confused by some aspects of circular motion. So, I understand that the centripetal force changes the direction of the ve...
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fft, autocorrelation, cross-correlation, c xcorr(in1, in2, out, N); Here are the outputs printed of the result of this cross-correlation. 1737.450000 -607.500000 3977.100000 -2257.200000 6641.700000 -4825.800000 9654.000000 -8190.000000 12936.750000 -12226.500000 16412.700000 -16812.000000 20004...
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classification $$ A=(PPV\cdot TPR)\enspace \enspace, \enspace \enspace B=(PPV+TPR) $$ $$ \frac{\delta_A}{|A|}=\frac{\delta_{PPV}}{|PPV|} + \frac{\delta_{TPR}}{|TPR|}\Rightarrow \delta_A=|A|\left(\frac{\delta_{PPV}}{|PPV|} + \frac{\delta_{TPR}}{|TPR|}\right) $$ $$ \delta_B = \delta_{PPV} + \delta_{TPR} $$ Then we also ...
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catkin-make from /home/claudia/catkin_ws/src/rbcar_sim/rbcar_robot_control/src/rbcar_robot_control.cpp:36: /opt/ros/indigo/include/ros/node_handle.h:581:14: note: template<class M, class T> ros::Subscriber ros::NodeHandle::subscribe(const string&, uint32_t, void (T::)(const boost::shared_ptr&), const boost::shared_ptr...
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objective-c, ios, networking -(void)result:(id)result WebServiceId:(int)webServiceId { if (![result isKindOfClass:[NSData class]]){ @throw [NSException exceptionWithName:NSInternalInconsistencyException reason:@"Result was not of type NSData!" userInfo:nil]; } } This is in My web service class and is d...
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seurat, single-cell Title: Seurat Integration I'm following the instructions for integration: https://satijalab.org/seurat/articles/integration_introduction.html And it's taking a while to run: immune.anchors <- FindIntegrationAnchors(object.list = ifnb.list, normalization.method = "SCT", anchor.features = feature...
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ros2, pointcloud That being said, it sounds like a great idea to offer point cloud compression! However, before a message is added to the core ROS message packages like sensor_msgs, there should be at least one (but better several) implementations that use the proposed message for a longer time. So the first step woul...
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radio Title: How far would a radio signal propagate in free space as compared to Earth's atmosphere? A curiosity question. Radio Propagation within Earth's atmosphere is via atmosphere. Broadly speaking a signal loses strength between bouncing off the ionized layer, and absorption by various earthy elements. If an ide...
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strings, swift, palindrome Title: Is Palindrom-function in Swift Task is simply to write the classic isPalindrom-function. Here's my implementation: func isStringPalindrom(str: String) -> Bool { let lcStr = str.lowercased() var i = 0 let aChars = Array(lcStr) while i < (lcStr.count / 2) { ...
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cell-biology, fluorescent-microscopy, cytoskeleton Other images for a more wholesome appreciation of the cytoskeleton. Here follow a few micrographs of HeLa cells. In green, actin. In red, intermediate filaments stained with vimentin: And now here you can see a microtubule stain in HeLa cells, in pink. Notice that so...
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spectroscopy, variable-star, radial-velocity Title: Does the expansion and contraction of a variable star affect the measured radial velocity? I've measured the heliocentric radial velocity of Beta Cephei using the doppler shift of the helium lines, I corrected for earth's motion using the doppler shift of the oxygen ...
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filter-design, finite-impulse-response, infinite-impulse-response, butterworth, chebyshev-filters %% Real time over all frames % we implement this as driect form I so the states are always guaranteed to % be continous signalState = zeros(2,4); % filter state, we need total of 8 freqState = frInput(1); % cutoff freque...
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php str_getcsv() may do what you want, but only because it is a hack. CSV stands for "Comma Separated Values" and is used to store and read data separated by commas. I think, though I can't find it documented anywhere, that I remember reading somewhere that it also uses angle brackets "<>" to separate groups and that ...
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python, reinventing-the-wheel Title: Generating all combinations and permutations of a set of symbols I am new to Python and want to have a "pythonic" coding style from the very beginning. Following is a piece of codes I wrote to generate all combinations and permutations of a set of symbols, e.g. abc or 123. I mainl...
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general-relativity, black-holes, spacetime, symmetry, quantum-gravity Suppose an inertial observer $\mathscr{A}$ has the usual spherical coordinates $(\theta, \phi)$, and has some clock for their proper time $\tau$. That observer shoots a light ray in the direction $(\theta, \phi)$ at time $\tau$, and the light ray e...
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simulation, nonclassicality, gottesman-knill quantum teleportation: this is a specific method that achieves a particular quantum task using, and providing, specific resources (bell pair+2 bits of classical communication=transmission of one unknown qubit state). You might be able to simulate it on a classical computer ...
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radio-astronomy, star-catalogues Title: Is there a complete edition of the Cambridge Catalogue of Radio Sources (esp. 3C) available digitally? In radio astronomy, many common objects are refered to by their designation from the 3rd Cambridge Catalogue of Radio Sources, e.g. 3C 353. For hobbyist purposes, I would like...
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beginner, c, event-handling, pthreads #endif event_test.c #include <stdio.h> #include <unistd.h> #include "EventListener.h" void *event_trigger_test(void *arg) { printf("%s\n", (char *) arg); } char *arg = "Event triggered!"; char *arg2 = "Event 2 triggered!"; void *event_trigger_loop_test(void *arg) { pr...
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complexity-theory, quantum-computing This statement is wrong. There are many NP problems which are easy to solve. "NP" simply means "easy to verify". It does not mean hard to solve. What you are probably thinking of is NP-complete problems which is a subset of the NP problems for which we have very, very good evidence...
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ocean, ocean-currents, tides Direct disruption of seabed habitats by physical interference, e.g. from moorings Disruption of ecological niches: Some organisms have evolved to survive in areas where others cannot - e.g. high current speed environments. Changes in seabed conditions, e.g. from greater or lesser current s...
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deep-learning, object-detection Title: How do I label images for deep learning classification? I have roughly 30,000 images of two categories, which are 'crops' and 'weeds.' An example of what I have can be found below: The goal will use my training images to detect weeds among crops, given an orthomosaic GIS image o...
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Statement $$(\star\star)$$ holds for $$n=0$$ from Lemma 5. For $$n \ge 1$$ and from Lemma 1, statement $$(\star\star)$$ is equivalent to $$x_{2m} < x_{2n -1} = x_{2(n-1)+1}$$, which is true by inductive hypothesis. As such, the statement holds for $$m+1$$. From Lemmas 3,4, and 6, our sequence $$(x_n)_{n \in \mathbb N}...
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control, ros-indigo Title: Ros Control: VelocityJointInterface and PositionJointInterface in one yaml Hello, i am currently trying to build a simple car model from scratch. So far my URDF comes along pretty good and my ROS Node also publishes data to the correct ros Node. Lately i have tried to swich from all EffortJ...
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machine-learning, dataset, training Title: Is it correct to join training and validation set before inferring on test-set? I would like to know if is a correct procedure to join training-set and validation-set together, in order to train the model on this new dataset, before making predictions on the test-set. Yes, on...
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to this function, we run into a problem, because for every given output of the quadratic function, there are two corresponding inputs (except when the input is 0). Does there exist a nonbijective function with both a left and right inverse? Making statements based on opinion; back them up with references or personal ex...
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newtonian-mechanics, lagrangian-formalism A PDF containing the statement of the problem and it's solution is available here. (Page 43) The notion of generalized momentum is not the same as the usual notion of momentum. In other words, $\frac{\partial L}{\partial \dot{x}}$ does not equal the mass of the big block times...
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$$\underline{\text{Case }\mathrm{u \le 0\le v\le 1-u-v}}.$$ $$f(u,v) = 1-2u,\quad u\le 0\le 2v\le 1-u,$$ $$\min f(u,v)= 1\quad\text{at}\quad u=0,\quad v\in\left[0,\frac12\right].$$ $$\underline{\text{Case }\mathrm{0\le u \le v\le 1-u-v}}.$$ $$\min f(u,v) = 1 \quad\text{at}\quad 0 \le u \le \dfrac13,\quad v \le \dfr...
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ros } int main(int argc, char** argv) { ros::init(argc, argv, "system_watchdog"); ros::NodeHandle nh; initFilename(); initNodeList(); initBonds(); ros::Rate rate(20.0); while (ros::ok()) { ros::spinOnce(); rate.sleep(); } return 0; } This code basically reads n...
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javascript, beginner, html, event-handling, firebase Code and Supplementary Info Since the code snippets here won't seem to let me connect to Firebase, I've hosted the site on its end destination at 000webhost, here. If you don't want to use your email and password, there's no verification so here's some fake login i...
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To cut the story short, these three nontrivial ("hard") cases can be found as following dissections: • $$c=13,k=6$$ has a dissection $$n=6^3-(9\cdot2^3+4\cdot3^3)+13=49$$. That is, $$(a_1,\dots,a_{13})=(2,2,2,2,2,2,2,2,2,3,3,3,3)$$ are composite cubes used. • $$c=10,k=6$$ has a dissection $$n=6^3-(5\cdot2^3+5\cdot3^3...
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c++, beginner, c++20, bigint using std::uint_least64_t; using std::uint32_t; using std::uintmax_t; using size_type = uint_least64_t; class bigint { static const uint_least64_t BASE=static_cast<uint_least64_t>(std::numeric_limits<uint32_t>::max())+1; static const uint_least64_t DIGITS10BASE=static_cast<ui...
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javascript, timer Now I notice your timer relies on setTimeout to count. There are 2 problems here. First, native JS timers aren't precise. That means putting 1000ms delay guarantees that it executes at least 1000ms, but not exactly at 1000. This means, every "tick" may drift off a few ms. The next problem is that you...
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# CARA Coefficient Calculation Consider the following scenario: A consumer with CARA (constant absolute risk aversion) claims that she is indifferent between "getting $2400 for sure" and "getting $5000 or $0, each with 50% possibility". I know that a consumer has CARA if and only if the vNM utility function is an af...
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quantum-mechanics, eigenvalue Title: $(E_n - E_m) \omega_{mn} = \sum_l (\omega_{ml}H_{ln}-H_{ml}\omega_{ln})$ It's an expression from Landau Lifshitz Statistical physics, where $\omega$ is density matrix. I have troubles with going from eigenvalues $E_n$ and $E_m$ to Hamiltonian matrix elements, besides putted in in d...
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swift, protocols // provided by UIViewController var view: UIView! { get } } extension SideH{ func layout(t title: String){ view.backgroundColor = UIColor.white headline = { () -> UILabel in let lbl = UILabel() lbl.font = UIFont.regular(ofSize: 18) lbl.tex...
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computability, undecidability, computer-algebra Title: Decidability of a problem concerning polynomials I have come across the following interesting problem: let $p,q$ be polynomials over the field of real numbers, and let us suppose that their coefficients are all integer (that is, there is a finite exact representat...
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1: Four carts and ve springs Solving for the normal modes and normal frequencies of this system is best accomplished using matrix methods, which is shown in the following equations. Coupled spring systems are fun and ubiquitous: in playgrounds, cars, and experimental physics lectures at universities. The spring has a s...
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cc.complexity-theory, complexity-classes, np Title: Best known joint containments for/by NP and Parity-P? Parity-P is the set of languages recognized by a non-deterministic Turing machine which can only distinguish between an even number or odd number of "acceptance" paths (rather than a zero or non-zero number of acc...
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Hence the probability of the drawn ball from $U_2$ being white is: $$\frac{3}{10}+\frac{1}{2}\cdot \frac{2}{10}+\frac{3}{20}+\frac{2}{3}\cdot \frac{6}{20}+\frac{1}{3}\cdot \frac{1}{20}=\frac{23}{30}.$$ • I am not getting how you got $\frac{3}{5}$ and $\frac{2}{5}$ in case $1$ – laura May 21 '18 at 12:19 • @laura The p...
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In fact the black marbles bear no such labels. We’ve counted each set of $10$ positions for the black marbles once for every permutation of the black marbles in those positions, so we’ve overcounted by another factor of $10!$. Dividing by $10!$ to compensate finally gives us the correct answer for the unlabelled marble...
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java, comparative-review, optional public User(AuthUser authUser, Set<String> roles) { this.userId = authUser.getUserId() == null ? "" : authUser.getUserId(); this.fullName = authUser.getFullName() == null ? "" : authUser.getFullName(); this.email = authUser.getEmail() == null ? "" : authUser.g...
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gazebo Title: how to? move to a postion hello all I have successfully implement the move_base package onto the gazebo. My goal is to move the robot to a specify position in x,y,z coordinate without too much worrying about avoiding the ostacles. Any ideas in which package I could use? Originally posted by gazer on Ga...
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newtonian-mechanics, angular-momentum, conservation-laws, planets Title: Why are the planets rotating on their own axis? Earth is revolving around sun because of gravity but what causes the earth to rotate itself? This question has been already asked here, but the answers are like, earth had a collision and it formed...
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to visualize long term. Phase portrait generator. 5 0xy (7) which itself is a dynamical equation, the phase portrait is a trajectory along the switching line σ = 0. By plotting phase portrait on the computer, show that the system undergoes a Hopf bifurcation at 휇 = 0. shown to produce sharp phase portraits in long-term...
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beginner, c, compiler Token *token = new_token(STRING_CONST); token->stringValue = sb_get(tmpSb); add_token(tokenizer, token); free(tmpSb); break; } if (strchr("{}()[].,;+-*/&|<>=~", chr) != NULL) { Token *token = new_token(SYMBOL); token->symbol = chr; add_token(tok...
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kinematics, forward-kinematics, transformation $$ giving us the final transformation matrix as $$ T_6^3=A_4A_5A_6=\left(\begin{array}{cccc} c_{4}\,c_{5}\,c_{6}-s_{4}\,s_{6} & -c_{6}\,s_{4}-c_{4}\,c_{5}\,s_{6} & c_{4}\,s_{5} & c_{4}\,d_{6}\,s_{5}\\ c_{4}\,s_{6}+c_{5}\,c_{6}\,s_{4} & c_{4}\,c_{6}-c_{5}\,s_{4}\,s_{6} & s...
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navigation, mapping Title: map saved in orbslam2 hi: i want to save a map in the system of orbslam2. But after i run the launch and the map is build, then the window is closed. So i can't get the map saved. I want to know whether the system have the functions of save the map.Can you tell me how to get the map saved? ...
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• Hey Jack, since i can't read the source you mentioned, could you please check if their derivation fits my approach? i'm quiet unsure if i made no big mistake here (it seems to easy to be true). thanks! – tired Jan 13 '17 at 12:38 • For the pyhsical background you might be interested in this presentation: cedricthieul...
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performance, c, comparative-review, palindrome This is still close to your initial code, in practice, I'd use a larger buffer just to be sure and also define the buffer size as a macro, so I can change it without risking to introduce an overflow bug. Regarding your second version, using scanf("%s", ...) will also over...
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javascript, php, jquery, ajax, codeigniter var allVals = []; $(".checkbox:checked").each(function() { allVals.push($(this).attr('data-id')); }); if(allVals.length <=0) { alert("Please select row."); ...
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python def vlookup(key, table, column, approximate_match=True): compare = __ge__ if approximate_match else __eq__ try: return max(row for row in table if compare(key, row[0]))[column] except ValueError: return None This excerpt works the same in both Python 2 and Python 3
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# Proof about inner automorphism of a group #### ianchenmu ##### Member Let $G$ be a group. Let $a ∈ G$. An inner automorphism of $G$ is a function of the form $\gamma_a : G → G$ given by $\gamma_a(g) = aga^{-1}$. Let $Inn(G)$ be the set of all inner automorphisms of G. (a) Prove that $Inn(G)$ forms a group. (startin...
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entanglement, mathematics Second question: We can take a basis $\{ U_i \}$ of $\mathcal{M}_d(\mathbb{C})$ composed of $d^2$ unitary matrices orthogonal with respect to the Hilbert-Schmidt scalar product on matrices. Then the family $\left( U_i \otimes \mathbb{I} \right)| \Omega \rangle$ is composed of $d^2$ orthonorma...
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chaos-theory, complex-systems Now my questions is: for the red and blue curve, even though Lyapunov exponents are positive, the "attractor diameter" seems to be tiny, judging by the maximal separation of trajectories of around $e^{-10}$. So can these systems really be considered "chaotic"? Even though they separate ex...
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• We can use Euler's method to find an approximate solution to the initial value problem \begin{align*} y' & = f(t, y),\\ y(a) & = \alpha \end{align*} on an interval $[a, b]\text{.}$ If we wish to find approximations at $N$ equally spaced points $t_1, \ldots, t_N\text{,}$ where $h = (b-a)/N$ and $t_i = a + i h\text{,}$...
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## Chapter 6 Ex.6.ME Question 12 A point on the hypotenuse of a triangle is at distance $$a$$ and $$b$$ from the sides of the triangle. Show that the minimum length of the hypotenuse is \begin{align}{\left( {{a^{\frac{2}{3}}} + {b^{\frac{2}{3}}}} \right)^{\frac{3}{2}}} \end{align}. ### Solution Let $$\Delta ABC$$ b...
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dataset Title: Alternative Source for Downloading OTB Dataset for Visual Object Tracking I'm interested in downloading the OTB dataset for visual object tracking. The official site (http://cvlab.hanyang.ac.kr/tracker_benchmark/index.html) appears to be down. Does anyone know of alternative sources or mirrors where I c...
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$\forall \ i=1,\cdots,n, \ \overline{H(U,y_i)} \subset G(U,y_i)$ $\forall \ i=1,\cdots,n, \ \overline{H(U,y_i) \times W_{y_i}} \subset \overline{H(U,y_i)} \times \overline{W_{y_i}} \subset G(U,y_i) \times V_{y_i} \subset U$ Then it follows that $\displaystyle (x,t) \in \overline{\bigcup \limits_{j=1}^n H(U,y_j) \tim...
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cc.complexity-theory, graph-theory Title: Is induced subgraph isomorphism easy on an infinite subclass? Is there a sequence of undirected graphs $\{C_n\}_{n\in \mathbb N}$, where each $C_n$ has exactly $n$ vertices and the problem Given $n$ and a graph $G$, is $C_n$ an induced subgraph of $G$? is known to be in cla...
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planets Title: What is Venus's core made of? As we all know Venus's surface is so hot that it can probably melt lead. What would be in it's in core? Is it in the liquid or solid state? What would be it's temperature? How many cores does it have? Scientists think that Venus' internal structure is somewhat like Earth's,...
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ros-melodic Title: Where are gazebo .world files? I installed ros melodic desktop full version. Os used Ubuntu Bionic. Gazebo that got installed along with ros is 9.13.0. Now I am trying to follow http://wiki.ros.org/simulator_gazebo/Tutorials/StartingGazebo . When I execute roslaunch gazebo_ros empty_world.launch , ...
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• Yes, for some applications it may be interesting to evaluate $F(n,s,t)$ for $s,t$ rational numbers. Alternatively we can scale the numbers up to integers. We need to add just one more parameter: each number $a_i$ is in $[0,q]$, for some integer $q\geq 1$. I think that in this case your technique leads to a lower boun...
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$$\left( \begin{array}{rrrr} t & \frac{1}{2t} & \frac{-1}{8 t^3} & \frac{1}{16 t^5} \\ 0 & t & \frac{1}{2t} & \frac{-1}{8 t^3}\\ 0 & 0 & t & \frac{1}{2t}\\ 0 & 0 & 0 & t \end{array} \right)^2 = \left( \begin{array}{rrrr} t^2 & 1 & 0 & 0\\ 0 & t^2 & 1 & 0 \\ 0 & 0 & t^2 & 1 \\ 0 & 0 & 0 & t^2 \end{array} \right)$$ $$\l...
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bruce the jet will fly 9.68 hours to cover either distance bruce Riley is planning to plant a lawn in his yard. He will need 9 pounds of grass seed. He wants to mix Bermuda seed that costs $4.80 per pound with Fescue seed that costs$3.50 per pound. How much of each seed should he buy so that the overall cost will be $4...
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ros, roslaunch, remote-launch printenv in the env.sh file on the tegra_b: MAIL=/var/mail/nvidia SSH_CLIENT=10.42.0.28 53326 22 USER=nvidia ROS_PACKAGE_PATH=/opt/ros/kinetic/share:/home/nvidia/catkin_ws/src SHLVL=1 LD_LIBRARY_PATH=/opt/ros/kinetic/lib:/opt/ros/kinetic/lib ROS_ETC_DIR=/opt/r...
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algorithms I think it has something to do with the number of bits for the binary representation of the exponent. What is also an intuitive numerical example? The main idea is that $a^x \cdot a^x = a^{2x}$. Now, in order to get, say, $a^{10}$ you can do $res = res * a$ for 10 times. On the other hand you can do compute...
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php, object-oriented, html, css, ip-address $mobile_ua = strtolower(substr(self::get_user_agent(), 0, 4)); $mobile_agents = array( 'w3c ','acs-','alav','alca','amoi','audi','avan','benq','bird','blac', 'blaz','brew','cell','cldc','cmd-','dang','doco','eric','hipt','inno', 'i...
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gazebo Title: how to draw lines from a plugin or via messages Hello, can anyone tell me how to draw lines via messages or from a plugin? I already tried DynamicLines and Scene->DrawLine from inside a world plugin but without results. It either crashed the server or nothing happened at all. Thanks for the help and bes...
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java, linked-list, enum, set Code Simplication indexOf(CharSequence) >= 0 can be replaced by contains(CharSequence). You can probably simplify your constructor as such, assuming the paths and naming conventions don't change: private Datacenter() { this.value = "/datacenter/" + name().toLowerCase(); } The Strings...
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A) f-140 B) 5f C) 7f D) f/5 E) f/7 The OE starts with "In this solution it is assumed that 1 billion = 109. However, only minor modifications in the first three steps are needed (replace each appearance of 10^9 with 10^12)". What do they mean by that and why is that important for the question at all. It confused me. ...
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proof-techniques, arrays, lower-bounds, comparison, decision-tree The exercise was probably aiming at the following simpler argument: if less than $\lceil n/2 \rceil$ comparisons are made, then there is at least one element which is not compared at all. Hence for all we know, it could be the maximum, or the minimum (i...
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c++, c++17, cache, polymorphism Heavy coupling between the mesh generation code and the mesh identification (keying) code Relying on a polymorphic structure to do the job of a map key (which usually should behave like a POD) requires prototype pattern (clone function) and heap allocation (dynamically sized key) While ...
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python, pandas Once you have that, it's relatively simple to adapt your previous code: df3 = df1[df1['is_buy'] == 1 && last7(df1['date'])].groupby(['id', 'month']).agg({'is_buy': np.sum}) Now we just join together df2 and df3 and we're done.
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python, python-3.x, programming-challenge, memory-optimization def remove_duplicates(nums): for i, value in enumerate(unique_justseen(nums)): nums[i] = value return i + 1 For nums = list(np.random.randint(100, size=10000)) they take almost the same time: removeDuplicates took 0.0023s remove_duplicate...
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ros, pi-tracker process[skeleton_tracker-7]: started with pid [13557] process[base_world_broadcaster-8]: started with pid [13573] [skeleton_tracker-7] process has died [pid 13557, exit code -11]. log files: /home/nutan/.ros/log/09472306-4474-11e0-b8f6-00e081b5d370/skeleton_tracker-7*.log
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navigation, rrt, base-global-planner, ros-hydro, move-base <run_depend>angles</run_depend> <run_depend>boost</run_depend> <run_depend>costmap_2d</run_depend> <run_depend>eigen_conversions</run_depend> <run_depend>geometry_msgs</run_depend> <run_depend>nav_msgs</run_depend> <run_depend>nav_core</run_depend> <run_depend...
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policy. Also can you explain how the sum of the solid angles is equal to the total solid angle ? The solid angle of a cone with its apex at the apex of the solid angle, and with apex angle 2θ, is the area of a spherical cap on a unit sphere The sum of the solid angles is equal to the total solid angle. Ω = 4 arctan ⁡ α...
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trapezoid median theorem using vectors. This amounts to be a triangle proof to use CPCTC. Each lower base angle is supplementary to the upper base angle on the same side. A simple equation, Pythagorean Theorem states that the square of the hypotenuse (the side opposite to the right angle triangle) is equal to the sum o...
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reference-frames, renormalization, stress-energy-momentum-tensor, qft-in-curved-spacetime Title: Expectation value of $T_{\mu\nu}$ for uniform accelerating motion Birrell and Davies in their book state that if $\langle \psi|T_{\mu\nu}|\psi\rangle = 0$ in one reference frame then it must be zero for all others whereas ...
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# In this case, does $\{x_n\}$ converge given that $\{x_{2m}\}$ and $\{x_{2m+1}\}$ converge? I'm playing around with a sequence $\{x_n\}$ defined by $$x_{n+1}=\frac{\alpha+x_n}{1+x_n}=x_n+\frac{\alpha-x_n^2}{1+x_n}.$$ Here $\alpha\gt 1$, and $x_1\gt\sqrt{\alpha}$. I'm trying to compute $\lim\ x_n$. If it converges, i...
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java, hangman move++; wrLetter[x] = 2; checked[x] = 1; rong = x; } } } if (wrong == true) wrLetter[rong] = 2; wrong = true; if (move == 7) { ...
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molecular-structure, molecular-orbital-theory, theoretical-chemistry, transition-metals, magnetism Title: Contribution, and the way thereof, of the core 6p orbitals of compounds of plutonium(VIII) According to the NIST database, the ground-state configuration of plutonium(VIII) is [Hg]5f³6p³, when intuitively it shoul...
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c#, console, io Title: Calculate average from .txt file I have made an exercise where I need to calculate the average per row of a .txt file. (see below) Toa Narumi gradeA 10 8 7 4 6,5 Jean-François Le Clerk gradeB 5 4 7 Joe GradeC 10 10 I only want the numbers behind the name and grade. This is my code: using System...
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neptune Center geodetic : 0.00000000,0.00000000,0.0000000 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.00000000,0.00000000,0.0000000 {E-lon(deg),Dxy(km),Dz(km)} Center radii : (undefined) Output units : KM-D Output type : GEOMETRIC cartesian states Output format : 6 (LT, range, and range-rate) Referen...
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