ComputeModel function implementation in Line

[jiayily]

Hi, the line parameters solving in your code involves eigenvalues. Can you show me a formula derivation about this implementation. I tried to do it by myself but failed. Thank you so much.

[DavidHernandezLopez]

I think there is a bug.
virtual Line ComputeModel(const std::vector& data, const std::set& samples)
when not if (fabs(b) > DBL_EPSILON)
a and b coefficients for lines in x and y axis solved by:

        double maxDiffX=0.;
        double maxDiffY=0.;
        for(int np=0;np<(data.size()-1);np++)
        {
            double diffX=fabs(data[np+1].x-data[np].x);
            if(diffX>maxDiffX) maxDiffX=diffX;
            double diffY=fabs(data[np+1].y-data[np].y);
            if(diffY>maxDiffY) maxDiffY=diffY;
        }
        if(maxDiffX<maxDiffY)
        {
            line.a = 1;
            line.b = 0;
        }
        else
        {
            line.a = 0;
            line.b = 1;
        }