How to write a loop to count the number of instances of a certain number occurring in each row?

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Joelle Martin
Joelle Martin on 2 Oct 2015
Commented: Joelle Martin on 5 Oct 2015
I have a matrix (m) that is 159 rows and 6 columns. There are 1s, 2s, and NaNs. I need to count the number of times a '2' happens in each row. Please help! I wrote sum(m(26,:) == 2) but it is too tedious to do 159 times!

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Accepted Answer

dpb
dpb on 2 Oct 2015
Use the second, optional argument to sum--
s=sum(m==2,2); % doc sum for details...

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