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Count Number of Occurrences of Certain Character in String in R - GeeksforGeeks	16 May, 2021 In this article, we will discuss how to count the number of occurrences of a certain character in String in R Programming Language. The stringR package in R is used to perform string manipulations. It needs to be explicitly installed in the working space to access its methods and routines. install.packag...	[ { "code": null, "e": 24385, "s": 24354, "text": " \n16 May, 2021\n" }, { "code": null, "e": 24517, "s": 24385, "text": "In this article, we will discuss how to count the number of occurrences of a certain character in String in R Programming Language." }, { "code": null, ...
Enumerate through a Vector using Java Enumeration - GeeksforGeeks	07 Jan, 2021 In the Java Enumeration class, all the listed constants are public, static, and final by default. Now after creating a Vector if we want to enumerate through the Vector then at first, we must get an Enumeration of the Vector’s element, and to do, so we use the elements() method. This method is a member fun...	[ { "code": null, "e": 23948, "s": 23920, "text": "\n07 Jan, 2021" }, { "code": null, "e": 24517, "s": 23948, "text": "In the Java Enumeration class, all the listed constants are public, static, and final by default. Now after creating a Vector if we want to enumerate through the V...
Java - The HashMap Class	The HashMap class uses a hashtable to implement the Map interface. This allows the execution time of basic operations, such as get( ) and put( ), to remain constant even for large sets. Following is the list of constructors supported by the HashMap class. HashMap( ) This constructor constructs a default HashMap. HashMa...	[ { "code": null, "e": 2563, "s": 2377, "text": "The HashMap class uses a hashtable to implement the Map interface. This allows the execution time of basic operations, such as get( ) and put( ), to remain constant even for large sets." }, { "code": null, "e": 2633, "s": 2563, "text...
How to change display mode with Java Swings	To change display mode with Java Swings, use the setDisplayMode() method. Here, we have set the Display mode as: new DisplayMode(800, 600, 32, 60)); Now, when you will run the program, the frame would be visible in a different resolution than the actual set resolution of your system. The following is an example to chan...	[ { "code": null, "e": 1175, "s": 1062, "text": "To change display mode with Java Swings, use the setDisplayMode() method. Here, we have set the Display mode as:" }, { "code": null, "e": 1211, "s": 1175, "text": "new DisplayMode(800, 600, 32, 60));" }, { "code": null, "...
\vphantom - Tex Command	\vphantom - vertical phantom. { \vphantom #1 } The box created by \vphantom has the height and depth of its argument, but its width is zero (so it doesn't contribute to any horizontal spacing issues). In other words, \hphantom creates vertical space equal to that produced by its argument, but doesn't create any horizo...	[ { "code": null, "e": 8016, "s": 7986, "text": "\\vphantom - vertical phantom." }, { "code": null, "e": 8033, "s": 8016, "text": "{ \\vphantom #1 }" }, { "code": null, "e": 8318, "s": 8033, "text": "The box created by \\vphantom has the height and depth of its ...
iOS - Table View	It is used for displaying a vertically scrollable view which consists of a number of cells (generally reusable cells). It has special features like headers, footers, rows, and section. delegate dataSource rowHeight sectionFooterHeight sectionHeaderHeight separatorColor tableHeaderView tableFooterView - (UITableViewCell...	[ { "code": null, "e": 2276, "s": 2091, "text": "It is used for displaying a vertically scrollable view which consists of a number of cells (generally reusable cells). It has special features like headers, footers, rows, and section." }, { "code": null, "e": 2285, "s": 2276, "text"...
How to add command line arguments in Python?	Python has a very powerful argparse module which provides functions for parsing command line arguments. If we want to get the user input from the OS command line without a lot of interaction or code a program that accepts parameters from the command line e.g. Provide a URL to parse or accepts the file to upload to a S3...	[ { "code": null, "e": 1437, "s": 1062, "text": "Python has a very powerful argparse module which provides functions for parsing command line arguments. If we want to get the user input from the OS command line without a lot of interaction or code a program that accepts parameters from the command lin...
C++ List Library - sort() Function	The C++ function std::list::sort() sorts the elements of the list in ascending order. The order of equal elements is preserved. It uses operator< for comparison. Following is the declaration for std::list::sort() function form std::list header. void sort(); None None This member function never throws exception. Linear...	[ { "code": null, "e": 2765, "s": 2603, "text": "The C++ function std::list::sort() sorts the elements of the list in ascending order. The order of equal elements is preserved. It uses operator< for comparison." }, { "code": null, "e": 2848, "s": 2765, "text": "Following is the dec...
How to create file of particular size in Python?	To create a file of a particular size, just seek to the byte number(size) you want to create the file of and write a byte there. with open('my_file', 'wb') as f: f.seek(1024 * 1024 * 1024) # One GB f.write('0') This creates a sparse file by not actually taking up all that space. To create a full file, you shoul...	[ { "code": null, "e": 1191, "s": 1062, "text": "To create a file of a particular size, just seek to the byte number(size) you want to create the file of and write a byte there." }, { "code": null, "e": 1281, "s": 1191, "text": "with open('my_file', 'wb') as f:\n f.seek(1024 * 1...
Build a Machine Learning Model to a Practical Use-Case From Scratch \| by Yasas Sandeepa \| Towards Data Science	Machine Learning is an enormous area. It is empowering technology for allowing us to develop software solutions much faster than before and currently the state-of-the-art solution for a wide range of problems. We can apply it to almost every domain. In this article, we are going to study in-depth how the process for de...	[ { "code": null, "e": 551, "s": 172, "text": "Machine Learning is an enormous area. It is empowering technology for allowing us to develop software solutions much faster than before and currently the state-of-the-art solution for a wide range of problems. We can apply it to almost every domain. In th...
Use Pre-trained Word Embedding to detect real disaster tweets \| by Zeineb Ghrib \| Towards Data Science	In this post we will go through the overall text classification pipeline, and especially the data pre-processing steps, we will be using a Glove pre-trained word embedding. Textual features processing is a little bit more tricky than linear or categorical features. In fact, machine learning algorithms are more about sc...	[ { "code": null, "e": 750, "s": 172, "text": "In this post we will go through the overall text classification pipeline, and especially the data pre-processing steps, we will be using a Glove pre-trained word embedding. Textual features processing is a little bit more tricky than linear or categorical...
Python program to sort a list according to the second element in the sublist.	List is given, our task is to sort a list according to the second element in the sublist. Here we apply simple bubble sort. Input : [['CCC', 15], ['AAA', 10], ['RRRR', 2],['XXXX', 150]] Output : [['RRRR', 2], ['AAA', 10], ['CCC', 15], ['XXXX', 150]] Step 1: Given a list. Step 2: We have tried to access the second eleme...	[ { "code": null, "e": 1186, "s": 1062, "text": "List is given, our task is to sort a list according to the second element in the sublist. Here we apply simple bubble sort." }, { "code": null, "e": 1312, "s": 1186, "text": "Input : [['CCC', 15], ['AAA', 10], ['RRRR', 2],['XXXX', 15...
Sort and Reverse Vector \| Practice \| GeeksforGeeks	You are given a vector V of size n. You need to sort it and reverse it. Example 1: Input: n = 5 V = 1 2 3 4 5 Output: 1 2 3 4 5 5 4 3 2 1 Your Task: Since this is a function problem, you don't need to take any input. Just complete the provided functions sortVector() and reverseVector(). Return the vector after perfo...	[ { "code": null, "e": 298, "s": 226, "text": "You are given a vector V of size n. You need to sort it and reverse it." }, { "code": null, "e": 310, "s": 298, "text": "Example 1: " }, { "code": null, "e": 367, "s": 310, "text": "Input:\nn = 5\nV = 1 2 3 4 5\nOut...
Lagrange Interpolation	For constructing new data points within a range of a discrete set of given data point, the interpolation technique is used. Lagrange interpolation technique is one of them. When the given data points are not evenly distributed, we can use this interpolation method to find the solution. For the Lagrange interpolation, w...	[ { "code": null, "e": 1414, "s": 1062, "text": "For constructing new data points within a range of a discrete set of given data point, the interpolation technique is used. Lagrange interpolation technique is one of them. When the given data points are not evenly distributed, we can use this interpola...
Delete Tree Nodes in C++	Suppose we have a tree, this tree is rooted at node 0, this is given as follows − Number of nodes is nodesValue of ith node is value[i]Parent of ith node is parent[i] Number of nodes is nodes Value of ith node is value[i] Parent of ith node is parent[i] We have to remove every subtree whose sum of values of nodes is 0,...	[ { "code": null, "e": 1144, "s": 1062, "text": "Suppose we have a tree, this tree is rooted at node 0, this is given as follows −" }, { "code": null, "e": 1229, "s": 1144, "text": "Number of nodes is nodesValue of ith node is value[i]Parent of ith node is parent[i]" }, { "...
Bitwise Operators in C++	There are 3 bitwise operators available in c++. These are the bitwise AND(&), bitwise OR(\|) and the bitwise XOR(^). The bitwise AND operator (&) compares each bit of the first operand to the corresponding bit of the second operand. If both bits are 1, the corresponding result bit is set to 1. Otherwise, the correspondi...	[ { "code": null, "e": 1178, "s": 1062, "text": "There are 3 bitwise operators available in c++. These are the bitwise AND(&), bitwise OR(\|) and the bitwise XOR(^)." }, { "code": null, "e": 1501, "s": 1178, "text": "The bitwise AND operator (&) compares each bit of the first operan...
SVM (Support Vector Machine) for classification \| by Aditya Kumar \| Towards Data Science	SVM: Support Vector Machine is a supervised classification algorithm where we draw a line between two different categories to differentiate between them. SVM is also known as the support vector network. Consider an example where we have cats and dogs together. We want our model to differentiate between cats and dogs. T...	[ { "code": null, "e": 374, "s": 171, "text": "SVM: Support Vector Machine is a supervised classification algorithm where we draw a line between two different categories to differentiate between them. SVM is also known as the support vector network." }, { "code": null, "e": 432, "s": 3...
AWT TextListener Interface	The class which processes the TextEvent should implement this interface.The object of that class must be registered with a component. The object can be registered using the addTextListener() method. Following is the declaration for java.awt.event.TextListener interface: public interface TextListener extends EventLi...	[ { "code": null, "e": 1947, "s": 1747, "text": "The class which processes the TextEvent should implement this interface.The object of that class must be registered with a component. The object can be registered using the addTextListener() method. " }, { "code": null, "e": 2019, "s": 1...
C++ Program to Perform Postorder Non-Recursive Traversal of a Given Binary Tree	If a binary tree is traversed post-order, the left subtree is visited first, then the right sub-tree and later the root. This is a C++ Program for Post Order Tree traversal without recursion. We do the program here by using stack. For postorder traversal: Begin Declare postorder_traversal(struct nodet,struct tree*...	[ { "code": null, "e": 1293, "s": 1062, "text": "If a binary tree is traversed post-order, the left subtree is visited first, then the right sub-tree and later the root. This is a C++ Program for Post Order Tree traversal without recursion. We do the program here by using stack." }, { "code": ...
A comprehensive Machine Learning workflow with multiple modelling using caret and caretEnsemble in R \| by Gabriel Pierobon \| Towards Data Science	I’ll use a very interesting dataset presented in the book Machine Learning with R from Packt Publishing, written by Brett Lantz. My intention is to expand the analysis on this dataset by executing a full supervised machine learning workflow which I’ve been laying out for some time now in order to help me attack any sim...	[ { "code": null, "e": 545, "s": 172, "text": "I’ll use a very interesting dataset presented in the book Machine Learning with R from Packt Publishing, written by Brett Lantz. My intention is to expand the analysis on this dataset by executing a full supervised machine learning workflow which I’ve bee...
C - typedef	The C programming language provides a keyword called typedef, which you can use to give a type a new name. Following is an example to define a term BYTE for one-byte numbers − typedef unsigned char BYTE; After this type definition, the identifier BYTE can be used as an abbreviation for the type unsigned char, for exam...	[ { "code": null, "e": 2260, "s": 2084, "text": "The C programming language provides a keyword called typedef, which you can use to give a type a new name. Following is an example to define a term BYTE for one-byte numbers −" }, { "code": null, "e": 2289, "s": 2260, "text": "typede...
ES6 - Arrays	The use of variables to store values poses the following limitations − Variables are scalar in nature. In other words, a variable declaration can only contain a single at a time. This means that to store n values in a program, n variable declarations will be needed. Hence, the use of variables is not feasible when one ...	[ { "code": null, "e": 2348, "s": 2277, "text": "The use of variables to store values poses the following limitations −" }, { "code": null, "e": 2643, "s": 2348, "text": "Variables are scalar in nature. In other words, a variable declaration can only contain a single at a time. Thi...
Changing the color a Tkinter rectangle on clicking	The Canvas widget in Tkinter is one of the versatile widgets in Tkinter which is used for developing dynamic GUI interface of the application such as shapes, logo, arcs, animating objects, and many more. With the help of the create_rectangle(top, left, bottom, right, **options) constructor, we can create a rectangular ...	[ { "code": null, "e": 1509, "s": 1062, "text": "The Canvas widget in Tkinter is one of the versatile widgets in Tkinter which is used for developing dynamic GUI interface of the application such as shapes, logo, arcs, animating objects, and many more. With the help of the create_rectangle(top, left, ...
Dijkstra’s Shortest Path Algorithm	The main problem is the same as the previous one, from the starting node to any other node, find the smallest distances. In this problem, the main difference is that the graph is represented using the adjacency matrix. (Cost matrix and adjacency matrix is similar for this purpose). For the adjacency list representation...	[ { "code": null, "e": 1345, "s": 1062, "text": "The main problem is the same as the previous one, from the starting node to any other node, find the smallest distances. In this problem, the main difference is that the graph is represented using the adjacency matrix. (Cost matrix and adjacency matrix ...
How can we implement Flow API using Publisher-Subscriber in Java 9?	Flow API (java.util.concurrent.Flow) has introduced in Java 9. It helps to understand different ways in which the Publisher and Subscriber interfaces interact to perform desired operations. Flow API consists of Publisher, Subscriber, Subscription, and Processor interfaces, which can be based on reactive stream specific...	[ { "code": null, "e": 1252, "s": 1062, "text": "Flow API (java.util.concurrent.Flow) has introduced in Java 9. It helps to understand different ways in which the Publisher and Subscriber interfaces interact to perform desired operations." }, { "code": null, "e": 1389, "s": 1252, "...
Predicting destination countries for new users of Airbnb \| by Tanmayee W \| Towards Data Science	I found this interesting challenge posted by Airbnb on Kaggle 3 years ago. But it is never too late to get you hands dirty with a stimulating data challenge! :) This Kaggle challenge presents a problem to predict which country will be a new user’s booking destination. For the purpose of this challenge, we will make use...	[ { "code": null, "e": 207, "s": 46, "text": "I found this interesting challenge posted by Airbnb on Kaggle 3 years ago. But it is never too late to get you hands dirty with a stimulating data challenge! :)" }, { "code": null, "e": 405, "s": 207, "text": "This Kaggle challenge pres...
spaCy - Command Line Helpers	This chapter gives information about the command line helpers used in spaCy. spaCy v1.7.0 and above comes with new command line helpers. It is used to download as well as link the models. You can also use it to show the useful debugging information. In short, command line helpers are used to download, train, package mo...	[ { "code": null, "e": 2149, "s": 2072, "text": "This chapter gives information about the command line helpers used in spaCy." }, { "code": null, "e": 2423, "s": 2149, "text": "spaCy v1.7.0 and above comes with new command line helpers. It is used to download as well as link the mo...
MySQL query to increment one of the column values	Let us first create a table − mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(100), -> Score int -> ); Query OK, 0 rows affected (0.78 sec) Insert some records in the table using insert command − mysql> insert into DemoTable(Name,Score) values('John',68); Query OK, 1 ro...	[ { "code": null, "e": 1092, "s": 1062, "text": "Let us first create a table −" }, { "code": null, "e": 1252, "s": 1092, "text": "mysql> create table DemoTable\n-> (\n-> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,\n-> Name varchar(100),\n-> Score int\n-> );\nQuery OK, 0 rows affect...
Building Machine Learning Pipelines using Snowflake and Dask \| by Daniel Foley \| Towards Data Science	Recently I have been trying to find better ways to improve my workflow as a data scientist. I tend to spend a decent chunk of my time modelling and building ETLs in my job. This has meant that more and more I need to rely on tools to reliably and efficiently handle large datasets. I quickly realised that using pandas f...	[ { "code": null, "e": 607, "s": 172, "text": "Recently I have been trying to find better ways to improve my workflow as a data scientist. I tend to spend a decent chunk of my time modelling and building ETLs in my job. This has meant that more and more I need to rely on tools to reliably and efficien...
Supply Chain Optimization with Python \| by Samir Saci \| Towards Data Science	Supply chain optimization makes the best use of data analytics to find an optimal combination of factories and distribution centres to match supply and demand. Because of the current surge in shipping costs, companies start to challenge their current footprint to adapt to the post-covid “New Normal”. In this article, w...	[ { "code": null, "e": 332, "s": 172, "text": "Supply chain optimization makes the best use of data analytics to find an optimal combination of factories and distribution centres to match supply and demand." }, { "code": null, "e": 474, "s": 332, "text": "Because of the current sur...
Close Bootstrap class	Use the generic close icon for dismissing content like models and alerts. Use the class close to getting the close icon. You can try to run the following code to implement a close Bootstrap class Live Demo <!DOCTYPE html> <html> <head> <title>Bootstrap Example</title> <link href = "/bootstrap/css/bootstr...	[ { "code": null, "e": 1183, "s": 1062, "text": "Use the generic close icon for dismissing content like models and alerts. Use the class close to getting the close icon." }, { "code": null, "e": 1258, "s": 1183, "text": "You can try to run the following code to implement a close Bo...
Find all triplets with zero sum - GeeksforGeeks	20 Apr, 2022 Given an array of distinct elements. The task is to find triplets in the array whose sum is zero. Examples : Input : arr[] = {0, -1, 2, -3, 1} Output : (0 -1 1), (2 -3 1) Explanation : The triplets with zero sum are 0 + -1 + 1 = 0 and 2 + -3 + 1 = 0 Input : arr[] = {1, -2, 1, 0, 5} Output : 1 -2 1 Ex...	[ { "code": null, "e": 40885, "s": 40857, "text": "\n20 Apr, 2022" }, { "code": null, "e": 40983, "s": 40885, "text": "Given an array of distinct elements. The task is to find triplets in the array whose sum is zero." }, { "code": null, "e": 40995, "s": 40983, "...
DSA using Java - Arrays	Array is a container which can hold fix number of items and these items should be of same type. Most of the datastructure make use of array to implement their algorithms. Following are important terms to understand the concepts of Array Element − Each item stored in an array is called an element. Element − Each item st...	[ { "code": null, "e": 2405, "s": 2168, "text": "Array is a container which can hold fix number of items and these items should be of same type. Most of the datastructure make use of array to implement their algorithms. Following are important terms to understand the concepts of Array" }, { "c...
How to set the layout weight of a TextView programmatically in Android using Kotlin?	This example demonstrates how to set the layout weight of a TextView programmatically in Android. Step 1 − Create a new project in Android Studio, go to File? New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main.xml. <?xml version="1.0" encoding=...	[ { "code": null, "e": 1160, "s": 1062, "text": "This example demonstrates how to set the layout weight of a TextView programmatically in Android." }, { "code": null, "e": 1288, "s": 1160, "text": "Step 1 − Create a new project in Android Studio, go to File? New Project and fill al...
What is the meaning of ‘empty set’ in MySQL result set?	If there is ‘empty set’ in the result set of MySQL query then it means that MySQL is returning no rows and no error also in the query. It can be understood with the help of the following example − mysql> Select * from Student_info WHERE Name = 'ABCD'; Empty set (0.00 sec) We can see the empty set and execution time as ...	[ { "code": null, "e": 1259, "s": 1062, "text": "If there is ‘empty set’ in the result set of MySQL query then it means that MySQL is returning no rows and no error also in the query. It can be understood with the help of the following example −" }, { "code": null, "e": 1335, "s": 1259...
PyQt5 - QDockWidget - GeeksforGeeks	11 Aug, 2021 QDockWidget provides the concept of dock widgets, also know as tool palettes or utility windows. Dock windows are secondary windows placed in the dock widget area around the central widget in a QMainWindow(original window). Dock windows can be moved inside their current area, moved into new areas and float...	[ { "code": null, "e": 24792, "s": 24764, "text": "\n11 Aug, 2021" }, { "code": null, "e": 25332, "s": 24792, "text": "QDockWidget provides the concept of dock widgets, also know as tool palettes or utility windows. Dock windows are secondary windows placed in the dock widget area ...
This will make you understand how hard Data Science really is \| by Thijs Essens \| Towards Data Science	tl;dr: it’s very hard Every day, people try to live up to computer science savants and try to break into the field of Data Science. How hard is it? What does it take? Where do I start? In this blog I’ll summarize the 3 hardest challenges I faced doing my first Data Science project in this Kaggle Notebook: You know noth...	[ { "code": null, "e": 194, "s": 172, "text": "tl;dr: it’s very hard" }, { "code": null, "e": 304, "s": 194, "text": "Every day, people try to live up to computer science savants and try to break into the field of Data Science." }, { "code": null, "e": 357, "s": 304...
Creating a Multilevel Inheritance Hierarchy in Java	Inheritance involves an object acquiring the properties and behaviour of another object. So basically, using inheritance can extend the functionality of the class by creating a new class that builds on the previous class by inheriting it. Multilevel inheritance is when a class inherits a class which inherits another cl...	[ { "code": null, "e": 1301, "s": 1062, "text": "Inheritance involves an object acquiring the properties and behaviour of another object. So basically, using inheritance can extend the functionality of the class by creating a new class that builds on the previous class by inheriting it." }, { ...
BPEL - Quick Guide	SOA or the Service Oriented Architecture is an architectural approach, which makes use of technology to present business processes as reusable services. It is focused on the business and enables process transformation to new levels of integration, visualization, monitoring, and optimization. It is focused on the busine...	[ { "code": null, "e": 2614, "s": 2461, "text": "SOA or the Service Oriented Architecture is an architectural approach, which makes use of technology to present business processes as reusable services." }, { "code": null, "e": 2754, "s": 2614, "text": "It is focused on the business...
Numbers less than N that are perfect cubes and the sum of their digits reduced to a single digit is 1 - GeeksforGeeks	11 May, 2021 Given a number n, the task is to print all the numbers less than or equal to n which are perfect cubes as well as the eventual sum of their digits is 1.Examples: Input: n = 100 Output: 1 64 64 = 6 + 4 = 10 = 1 + 0 = 1 Input: n = 1000 Output: 1 64 343 1000 Approach: For every perfect cube less than or...	[ { "code": null, "e": 24327, "s": 24299, "text": "\n11 May, 2021" }, { "code": null, "e": 24491, "s": 24327, "text": "Given a number n, the task is to print all the numbers less than or equal to n which are perfect cubes as well as the eventual sum of their digits is 1.Examples: ...