recommend change to start of diff() so it works generally

[uoa1184615]

Currently, diff(x) and diff(x,2) cause an error. This simple change to AutoDiff.m appears to at least allow diff() to do its job properly.

        function x = diff(x, n, dim)
            if nargin<3, dim=1; end %AJR, 28 May 2026
            if nargin<2, n=1;   end %AJR, 28 May 2026
            if n>1 %AJR, 28 May 2026, recursion probably inefficient
                x = diff(x,n-1,dim);
            end
            if issparse(x.values)

[uoa1184615]

Remembered that diff() operates on the first non-singleton dimension, so change my suggested start of AutoDiff:diff() to more like this:

        function x = diff(x, n, dim)
            if nargin<3, dim=min(find(size(x)>1)); end %AJR, 31 May 2026
            if nargin<2, n=1;   end %AJR, 28 May 2026
            if n>1 %AJR, 28 May 2026, recursion probably inefficient
                x = diff(x,n-1,dim);
            end
            if issparse(x.values)

[uoa1184615]

Also recommend the following tweaks to AutoDiff.m in order to avoid output of x info

        function x = real(x)
            x.derivatives = real(x.derivatives);%added ; AJR, 3 Jun 2026
            x.values = real(x.values);
        end

        function x = imag(x)
            x.derivatives = imag(x.derivatives);%added ; AJR, 3 Jun 2026
            x.values = imag(x.values);
        end

[uoa1184615]

Question: any chance of getting AutoDiff to encompass fft() and ifft()?