I have this patch below, which allows to interpolate a little matrix to a bigger one.

It uses [jit.pwindow] as GUI to "setcell" for the little matrix.

If I change the dimensions of this matrix, then the mouse pointer in the pwindow doesn't "accord" anymore with coords cells in [jit.pwindow].

I know it's a maths mapping problem, and it comes quite often,

Does anyone get an example patch somewhere which could help me?

I have this patch below, which allows to interpolate a little matrix to a bigger one.
It uses [jit.pwindow] as GUI to "setcell" for the little matrix.

I know it's a maths mapping problem, and it comes quite often,
but I don't know how to approach it.

setcell and jit.pwindow as GUI - simple mapping problem