MATLAB Answers

find all indices in a matrix

24 views (last 30 days)
How can I find all indices in a matrix to include the zero and non-zero elements? .Thanks

Accepted Answer

Walter Roberson
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 Comments
Oday Shahadh
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);

Sign in to comment.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!