find all indices in a matrix

How can I find all indices in a matrix to include the zero and non-zero elements? .Thanks

Answer 1

[Walter Roberson]

find(ones(size(TheMatrix))

This is not typically useful. Instead you would normally use something like

[R, C] = ndgrid(1:size(TheMatrix,1), 1:size(TheMatrix,2));

and then R will contain row indices and C would contain column indices, so R(I,J) will always be I and C(I,J) will always be J. This is mostly used in a form such as

RC = [R(:), C(:)];

This can also be created as

[R, C] = ind2sub(size(TheMatrix), 1:numel(TheMatrix));
RC = [R(:), C(:)];

[Oday Shahadh]

it works, thanks Walter

[Oday Shahadh]

Dear Walter, how can I find the indices of the max. and min in the syntax

DDDD = accumarray(OrbNO,elev,[],@(x) max(x)-min(x), 0);