To access pixel values in an OpenCV cv::Mat object, you first have to know the type of your matrix.
The most common types are:
CV_8UC1 for 8-bit 1-channel grayscale images;
CV_32FC1 for 32-bit floating point 1-channel grayscale images;
CV_8UC3 for 8-bit 3-channel color images; and
CV_32FC3 ...
Model
using System.ComponentModel.DataAnnotations;
public class ViewModel
{
[Required(ErrorMessage="Name is required")]
public string Name { get; set; }
[StringLength(14, MinimumLength = 14, ErrorMessage = "Invalid Phone Number")]
[Required(ErrorMessag...
You must add php to your path environment variable. Follow theses steps :
Windows 7 :
Right-click on a My Computer icon
Click Properties
Click Advanced system settings from the left nav
Click Advanced tab
Click Environment Variables button
In the System Variables section, select Path (case-...
Let's say you have an object like this:
var myObject = {
name: 'Peter'
}
Later in your code, you try to access myObject.name and you get George instead of Peter. You start wondering who changed it and where exactly it was changed. There is a way to place a debugger (or something else) on e...
You can implement the swipe-to-dismiss and drag-and-drop features with the RecyclerView without using 3rd party libraries.
Just use the ItemTouchHelper class included in the RecyclerView support library.
Instantiate the ItemTouchHelper with the SimpleCallback callback and depending on which functi...
Two Random class created at the same time will have the same seed value.
Using System.Guid.NewGuid().GetHashCode() can get a different seed even in the same time.
Random rnd1 = new Random();
Random rnd2 = new Random();
Console.WriteLine("First 5 random number in rnd1");
for (int i = 0...
Average
The AVG() aggregate function will return the average of values selected.
SELECT AVG(Salary) FROM Employees
Aggregate functions can also be combined with the where clause.
SELECT AVG(Salary) FROM Employees where DepartmentId = 1
Aggregate functions can also be combined with group by ...
Uses a partition criteria to group the row numbering according to it.
SELECT
ROW_NUMBER() OVER(PARTITION BY DepartmentId ORDER BY DepartmentId ASC) AS RowNumber,
DepartmentId, Fname, LName
FROM Employees
We can use jasmine.createSpy() to create a standalone spy. This is often useful if we need to pass a function as a callback to another function and want to test how it is used.
// source code
function each(arr, fn) {
arr.forEach(fn);
}
// test code
describe('each', function() {
let m...
The procedure describes how to add an Object library reference, and afterwards how to declare new variables with reference to the new library class objects.
The example below shows how to add the PowerPoint library to the existing VB Project.
As can be seen, currently the PowerPoint Object library...
We have a sample Spring boot application which stores user data in MongoDB and we are using Rest services to retrieve data
First there is a domain class i.e. POJO
@Document
public class User{
@Id
private String id;
private String name;
}
A corresponding repository based on ...
A common pitfall of child classes is that, if your parent and child both contain a constructor(__construct()) method, only the child class constructor will run. There may be occasions where you need to run the parent __construct() method from it's child. If you need to do that, then you will need to...
In the Project.pro file we add : CONFIG += sql
in MainWindow.h we write :
#include <QMainWindow>
#include <QSql>
#include <QDebug>
namespace Ui
{
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget...
In the Project.pro file we add : CONFIG += sql
in MainWindow.h we write :
#include <QMainWindow>
#include <QSql>
#include <QDebug>
namespace Ui
{
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget...
