Matlab type arrays in C++

Question

How to define arrays in C++/ Open CV as I do in matlab ?

for example:

x=a:b:c;

or

y=linspace(a,b,n);

Answer 1

Refer the previous answers for general answers to your question.

Specifically, to address the two examples that you mention, here is some equivalent c++ code using vectors for dynamically generating the arrays you mentioned (haven't tested):

#include <vector>
using std::vector;

vector<double> generateRange(double a, double b, double c) {
    vector<double> array;
    while(a <= c) {
        array.push_back(a);
        a += b;         // could recode to better handle rounding errors
    }
    return array;
}

vector<double> linspace(double a, double b, int n) {
    vector<double> array;
    double step = (b-a) / (n-1);

    while(a <= b) {
        array.push_back(a);
        a += step;           // could recode to better handle rounding errors
    }
    return array;
}

Answer 2

OpenCV offers some functions that are similar to Matlab, but their number is very limited.

You can

cv::Mat a = cv::Mat::eye(5);
cv::Mat b = cv::Mat::zeros(5);
cv::Mat img = cv::imread("myGorgeousPic.jpg");
cv::imwrite(img, "aCopyOfMyGorgeousPic.jpg");

It also supports diag()

But for most of that tricky Matlab functionality like linspace or magic or whatever, there is no correspondent in OpenCV, mostly because OpenCV is not a mathematics package, but a computer vision one. If you need some specific function, you can clone it in your project (aka write it by yourself)