Tutorial by Examples: r

A common and task of someone using the Linux Command Line (shell) is to search for files/directories with a certain name or containing certain text. There are 2 commands you should familiarise yourself with in order to accomplish this: Find files by name find /var/www -name '*.css' This will...

To make long text at most N characters long but leave last word intact, use .{0,N}\b pattern: ^(.{0,N})\b.*

Before making a pull request, it is useful to make sure that compile is successful and tests are passing for each commit in the branch. We can do that automatically using -x parameter. For example: git rebase -i -x make will perform the interactive rebase and stop after each commit to execute mak...

import tensorflow as tf dims, layers = 32, 2 # Creating the forward and backwards cells lstm_fw_cell = tf.nn.rnn_cell.BasicLSTMCell(dims, forget_bias=1.0) lstm_bw_cell = tf.nn.rnn_cell.BasicLSTMCell(dims, forget_bias=1.0) # Pass lstm_fw_cell / lstm_bw_cell directly to tf.nn.bidrectional_rnn ...

go run will run a program without creating an executable file. Mostly useful for development. run will only execute packages whose package name is main. To demonstrate, we will use a simple Hello World example main.go: package main import fmt func main() { fmt.Println("Hello, World...

Recover as the name implies, can attempt to recover from a panic. The recover must be attempted in a deferred statement as normal execution flow has been halted. The recover statement must appear directly within the deferred function enclosure. Recover statements in functions called by deferred f...

Let's take a sample class: public class Transaction { public string Category { get; set; } public DateTime Date { get; set; } public decimal Amount { get; set; } } Now, let us consider a list of transactions: var transactions = new List<Transaction> { new Transaction...

Most analysis customization is in the createComponents class, where the Tokenizer and TokenFilters are defined. CharFilters can be added in the initReader method. Analyzer analyzer = new Analyzer() { @Override protected Reader initReader(String fieldName, Reader reader) { retu...

TokenStream stream = myAnalyzer.tokenStream("myField", textToAnalyze); stream.addAttribute(CharTermAttribute.class); stream.reset(); while(stream.incrementToken()) { CharTermAttribute token = stream.getAttribute(CharTermAttribute.class); System.out.println(token.toString()); ...

After you’ve downloaded, these are the files and folders you should see: The bin folder holds the Cake console executables. The config folder holds the Configuration files CakePHP uses. Database connection details, bootstrapping, core configuration files and more should be stored here. The plug...

int signed_integer = -1; // The right shift operation exhibits implementation-defined behavior: int result = signed_integer >> 1;

// Supposing SCHAR_MAX, the maximum value that can be represented by a signed char, is // 127, the behavior of this assignment is implementation-defined: signed char integer; integer = 128;

// The allocation functions have implementation-defined behavior when the requested size // of the allocation is zero. void *p = malloc(0);

UISplitViewController must be the rootViewController of your application. AppDelegate.m - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after application launch. self.window = [[UIWindow alloc] i...

It is illegal to access a reference to an object that has gone out of scope or been otherwise destroyed. Such a reference is said to be dangling since it no longer refers to a valid object. #include <iostream> int& getX() { int x = 42; return x; } int main() { int& r...

itertools.permutations returns a generator with successive r-length permutations of elements in the iterable. a = [1,2,3] list(itertools.permutations(a)) # [(1, 2, 3), (1, 3, 2), (2, 1, 3), (2, 3, 1), (3, 1, 2), (3, 2, 1)] list(itertools.permutations(a, 2)) [(1, 2), (1, 3), (2, 1), (2, 3), (3...

Let's test our basic knowledge of tkinter by creating the classic "Hello, World!" program. First, we must import tkinter, this will vary based on version (see remarks section about "Differences between Python 2 and 3") In Python 3 the module tkinter has a lowercase t: import t...

import tkinter as tk class HelloWorld(tk.Frame): def __init__(self, parent): super(HelloWorld, self).__init__(parent) self.label = tk.Label(self, text="Hello, World!") self.label.pack(padx=20, pady=20) if __name__ == "__main__": ...

Pair allows us to treat two objects as one object. Pairs can be easily constructed with the help of template function std::make_pair. Alternative way is to create pair and assign its elements (first and second) later. #include <iostream> #include <utility> int main() { std::p...

In pass by value of parameter passing to a method, actual parameter value is copied to formal parameter value. So actual parameter value will not change after returning from called function. @interface SwapClass : NSObject -(void) swap:(NSInteger)num1 andNum2:(NSInteger)num2; @end @impleme...