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how can i determine whether a matrix of any size is sorted or not (by rows and by columns)?

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suppose i have A = [1 2 3 4; 5 6 7 8] is sorted
but A = [1 2 3 4; 5 6 8 7] is not
diff(A) returns "1"-s mtrix if columns are sorted

Answers (2)

Matt Fig
Matt Fig on 6 Dec 2012
Edited: Matt Fig on 6 Dec 2012
See the help for the ISSORTED function.
help issorted

Azzi Abdelmalek
Azzi Abdelmalek on 6 Dec 2012
Edited: Azzi Abdelmalek on 6 Dec 2012
out1=all(arrayfun(@(x) issorted(A(x,:)),1:size(A,1))) % by rows
out2=all(arrayfun(@(x) issorted(A(:,x)),1:size(A,2))) % by columns

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