# find all indices in a matrix

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Oday Shahadh on 10 Jan 2017
Commented: Oday Shahadh on 10 Jan 2017
How can I find all indices in a matrix to include the zero and non-zero elements? .Thanks

Walter Roberson on 10 Jan 2017
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(:)];
##### 2 CommentsShowHide 1 older comment
Oday Shahadh on 10 Jan 2017
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);

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