Tutorial by Examples: v

import numpy as np import cv2 #access a video from your disk #to use the GIF in this example, convert to avi! cap = cv2.VideoCapture('eg_videoRead.avi') #we are going to read 10 frames #we store the frames in a numpy structure #then we'll generate a minimum projection of those frame...

Below is an example for implementing a Search input box that helps users to search the occurances of a particular value across the datatable. In the below example, #report is the div id of the div that contains the search input box. This function is called as soon as the user enters a value in this...

Creating summation is quite easy in 3 steps On front panel, Add 2 numeric controls (number 1 and Number 2) and 1 numeric indicator (sum). Switch to block diagram(using CTRL+E) and connect Add block from numeric palette. Wire it to both numeric controls and sum indicator created in step 1. ...

From java tutorial The dictionary definition of polymorphism refers to a principle in biology in which an organism or species can have many different forms or stages. This principle can also be applied to object-oriented programming and languages like the Java language. Subclasses of a class can ...

You can add different dependencies for a specific product flavor. Just use the <flavorName>Compile 'group:name:x.y.z' syntax: android { ... productFlavors { flavor1 { //..... } flavor2 { //..... } } } ... d...

When Java annotations were first introduced there was no provision for annotating the target of an instance method or the hidden constructor parameter for an inner classes constructor. This was remedied in Java 8 with addition of receiver parameter declarations; see JLS 8.4.1. The receiver param...

A value_ptr is a smart pointer that behaves like a value. When copied, it copies its contents. When created, it creates its contents. // Like std::default_delete: template<class T> struct default_copier { // a copier must handle a null T const* in and return null: T* operator()(T co...

To create the serialVersionUID for a class in Kotlin you have a few options all involving adding a member to the companion object of the class. The most concise bytecode comes from a private const val which will become a private static variable on the containing class, in this case MySpecialCase: ...

// this function add custom interval (5 minutes) to the $schedules function five_minutes_interval( $schedules ) { $schedules['five_minutes'] = array( 'interval' => 60 * 5, 'display' => '5 minutes'; ); return $schedules; } // add a custom in...

The java command supports a wide range of options: All options start with a single hyphen or minus-sign (-): the GNU/Linux convention of using -- for "long" options is not supported. Options must appear before the <classname> or the -jar <jarfile> argument to be recog...

A question that occasionally on StackOverflow is whether it is appropriate to use assert to validate arguments supplied to a method, or even inputs provided by the user. The simple answer is that it is not appropriate. Better alternatives include: Throwing an IllegalArgumentException using cust...

The WMI type provider allows you to query WMI services with strong typing. To output the results of a WMI query as JSON, open FSharp.Management open Newtonsoft.Json // `Local` is based off of the WMI available at localhost. type Local = WmiProvider<"localhost"> let data = ...

A Receiver Operating Characteristic (ROC) curve plots the TP-rate vs. the FP-rate as a threshold on the confidence of an instance being positive is varied Algorithm for creating an ROC curve sort test-set predictions according to confidence that each instance is positive step through ...

Since Qt 5.5 we have a new wonderful TreeView, a control we've all been waiting for. A TreeView implements a tree representation of items from a model. In general it looks like other QML views - ListView or TableView. But data structure of TreeView is more complex. A data in ListView or TableView...

import sympy as sy x1, x2 = sy.symbols("x1 x2") equations = [ sy.Eq( 2*x1 + 1*x2 , 10 ), sy.Eq( 1*x1 - 2*x2 , 11 ) ] print sy.solve(equations) # Result: {x1: 31/5, x2: -12/5}

import sympy as sy x, y = sy.symbols("x y") # nsolve needs the (in this case: two) equations, the names of the variables # (x,y) we try to evaluate solutions for, and an initial guess (1,1) for the # solution print sy.nsolve((x**3+sy.exp(y)-4,x+3*y),(x,y),(1,1)) The result s...

Django Admin comes with some Models registerd by default. There a some occasions where you might want to remove a Model from the admin pages. This is done in the admin submodule. If your app wass created using manage.py startapp, the admin.py file should already lay in your app module. Otherwise cr...

Add this dependency to your project POM: <dependency> <groupId>com.typesafe.akka</groupId> <artifactId>akka-actor_2.11</artifactId> <version>2.4.4</version> </dependency> Create an Actor public class HelloWorldActor ext...

We need only one thing in order to delete an item from the Keychain: a CFDictionary with attributes describing the items to be deleted. Any items that match the query dictionary will be deleted permanently, so if you are only intending to delete a single item be sure to be specific with your query. ...

from __future__ import print_function import os, sys from PIL import Image for infile in sys.argv[1:]: f, e = os.path.splitext(infile) outfile = f + ".jpg" if infile != outfile: try: Image.open(infile).save(outfile) except IOError: ...