Selecting certain rows in an array
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Hi all, Matlab newbie here. I'm sure this is not a complicated question but I'm having no luck.
I have an array of 512 rows and 5 columns. Let's say column 1 is called A, 2 is called B, etc. I want to find row numbers where the value in A>0.10*max(A) and B<0.10*max(B), C<0.10*max(C), D<0.10*max(D). In other words, I want indexes where the value in only one column is greater than 10% of the max value in that column.
Any ideas? Thank you in advance, I learn a lot from these answers.
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Walter Roberson
2013-8-29
Supposing the array is R, then
cutoff = 0.10 * max(R); %max goes column by colum
find( R(:,1) > cutoff(1) & R(:,2) < cutoff(2) & R(:,3) < cutoff(3) & R(:,4) < cutoff(4) )
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