On Mon, 17 Jan 2022 at 17:59, Patrick Dupre <pdupre@gmx.com> wrote:

Hello,

I get the following error:

error: feval: function 'fftconv2' not found

octave-image provide fftconv2.m

can I use it? If yes, How?

Are you trying to use octave's fftconv2 function? In Fedora35 with octave and octave-image installed using dnf:

octave:8> pkg load image

pkg load image

octave:9> help fftconv2

help fftconv2

'fftconv2' is a function from the file /usr/share/octave/packages/image-2.12.0/fftconv2.m

-- Function File: fftconv2 (A, B)

-- Function File: fftconv2 (V1, V2, A)

-- Function File: fftconv2 (..., SHAPE)

Convolve 2 dimensional signals using the FFT.

This method is faster but less accurate than CONV2 for large A and

B. It also uses more memory. A small complex component will be

introduced even if both A and B are real.