With this example, we will see how to load a color image from disk and display it using OpenCV's built-in functions. We can use the C/C++, Python or Java bindings to accomplish this.
In C++:
#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <iostream>
usi...
Assumptions:
An Oracle JDK has been installed.
The JDK was installed to the default directory.
Setup steps
Open Windows Explorer.
In the navigation pane on the left right click on This PC (or Computer for older Windows versions).
There is a shorter way without using the explorer in...
The recommended way (Since ES5) is to use Array.prototype.find:
let people = [
{ name: "bob" },
{ name: "john" }
];
let bob = people.find(person => person.name === "bob");
// Or, more verbose
let bob = people.find(function(person) {
return person.na...
Ruby extends the standard group syntax (...) with a named group, (?<name>...). This allows for extraction by name instead of having to count how many groups you have.
name_reg = /h(i|ello), my name is (?<name>.*)/i #i means case insensitive
name_input = "Hi, my name is Zaphod Be...
After receiving the arguments, you can print them as follows:
int main(int argc, char **argv)
{
for (int i = 1; i < argc; i++)
{
printf("Argument %d: [%s]\n", i, argv[i]);
}
}
Notes
The argv parameter can be also defined as char *argv[].
argv[0] may co...
Create a receiver. This class will receive the intent and handle it how you wish.
public class AlarmReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
// Handle intent
int reqCode = intent.getExtras().getInt(&...
Background threads cannot modify the UI; almost all UIKit methods must be called on the main thread.
From a subclass of NSObject (including any UIViewController or UIView):
InvokeOnMainThread(() =>
{
// Call UI methods here
});
From a standard C# class:
UIApplication.SharedApplicat...
Assuming that bar is an alias for someCommand -flag1.
Type bar on the command line and then press Ctrl+alt+e
you'll get someCommand -flag1 where bar was standing.
To split one component off of the path:
>>> p = os.path.join(os.getcwd(), 'foo.txt')
>>> p
'/Users/csaftoiu/tmp/foo.txt'
>>> os.path.dirname(p)
'/Users/csaftoiu/tmp'
>>> os.path.basename(p)
'foo.txt'
>>> os.path.split(os.getcwd())
('/Users/csafto...
To find every vector of the form (x, y) where x is drawn from vector X and y from Y, we use expand.grid:
X = c(1, 1, 2)
Y = c(4, 5)
expand.grid(X, Y)
# Var1 Var2
# 1 1 4
# 2 1 4
# 3 2 4
# 4 1 5
# 5 1 5
# 6 2 5
The result is a data.frame with one...
Imagine you have the following HTML:
<div>
<label>Name:</label>
John Smith
</div>
And you need to locate the text "John Smith" after the label element.
In this case, you can locate the label element by text and then use .next_sibling property:
from ...
Have a table
NameAgeCityBob10ParisMat20BerlinMary24Prague
select Name from table where Age>10 AND City='Prague'
Gives
NameMary
select Name from table where Age=10 OR City='Prague'
Gives
NameBobMary
For if you have to fine-tune what is published.
import { Mongo } from 'meteor/mongo';
import { Meteor } from 'meteor/meteor';
import { Random } from 'meteor/random';
if (Meteor.isClient) {
// established this collection on the client only.
// a name is required (first parameter) and this...
On the server, you can create a publication like this. this.userId is the id of the user who is currently logged in. If no user is logged in, you might want to throw an error and respond to it.
import Secrets from '/imports/collections/Secrets';
Meteor.publish('protected_data', function () {
...
You can commit changes made to specific files and skip staging them using git add:
git commit file1.c file2.h
Or you can first stage the files:
git add file1.c file2.h
and commit them later:
git commit
The simplest use case is using the subprocess.call function. It accepts a list as the first argument. The first item in the list should be the external application you want to call. The other items in the list are arguments that will be passed to that application.
subprocess.call([r'C:\path\to\a...
In Angular $scope is the glue between the Controller and the View that helps with all of our data binding needs. Controller As is another way of binding controller and view and is mostly recommended to use. Basically these are the two controller constructs in Angular (i.e $scope and Controller As).
...
Although it is possible to create a fragment constructor with parameters, Android internally calls the zero-argument constructor when recreating fragments (for example, if they are being restored after being killed for Android's own reasons). For this reason, it is not advisable to rely on a constru...
Each enum class contains an implicit static method named values(). This method returns an array containing all values of that enum. You can use this method to iterate over the values. It is important to note however that this method returns a new array every time it is called.
public enum Day {
...
Lambda expressions can be used to handle events, which is useful when:
The handler is short.
The handler never needs to be unsubscribed.
A good situation in which a lambda event handler might be used is given below:
smtpClient.SendCompleted += (sender, args) => Console.WriteLine("Ema...
