Hello all

Do you know if it exists a function to replace values inside a Matrix?.

For example a naive implementation for a MatrixXi would be:

Code: Select all

void Replace(MatrixXi &mat, int find, int replace)
{
   for (int r = 0; r < mat.rows(); ++r)
      for (int c = 0; c < mat.cols(); ++c)
         if (mat(r, c) == find)
            mat(r, c) = replace;
}

Best regards
Koldo

you can use std::replace:

MatrixXi A;
std::replace(A.data(), A.data()+A.size(), key, newval);


or (more general but perhaps less efficient in this case):

A = (A.array()==key).select(newval, A);

Thank you Gael!