Matlab Polyfit in opencv

C++
1

a = [1 2 3 4]
b = [50 42 56 84]
c= polyfit( a, b,1 ) %matlab

result c = [ 11.6 29.0 ]

Is there any opencv code on this ?

Thanks in advancestrong text

2

Hi,
I don’t know such function in opencv.
You can use this code :

void polyfit(Mat x, Mat y, OutputArray z)
{
    Mat xx = Mat::ones(x.rows, 2, CV_64F);
    x.copyTo(xx(Range(0,x.rows),Range(0,1)));
    SVD s(xx);

    cout << xx << endl;
    s.backSubst(y, z);
}

 void main(void)
 {
        Mat x = (Mat_<double>(4, 1) << 1, 2, 3, 4);
        Mat y = (Mat_<double>(4, 1) << 50, 42, 56, 84);
        Mat z;
        polyfit(x, y, z);
        cout << z;
 }
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