compare elements in rows of a matrix

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michelef 2011-11-28

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采纳的回答： Walter Roberson

Hi,

I have the following matrix:

a=[1 2 3 9; 2 2 3 1; 3 3 3 3]

is there a function that compares the elements of every row?

Something that tells me if they are all different or all the same.

I would like to get

out=[1 0 0]

or

out=[0 0 1]

thanks,

michele

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Walter Roberson 2011-11-28

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One way:

all(diff(a,1,2)==0,2)

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Andrei Bobrov 2011-11-29

Hi Walter! Small typo, should be:

all(diff(a,1,2)==0,2)

Walter Roberson 2011-11-29

Thanks for catching that -- I didn't know that. I have edited to fix.

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michelef 2011-11-29

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many thanks :) have a nice day :)

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MATLAB Language Fundamentals Matrices and Arrays Resizing and Reshaping Matrices

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