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Topic: sum one column when a value in another column meets a criterion
Replies: 1   Last Post: Aug 2, 2012 5:27 AM

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Sargondjani

Posts: 176
Registered: 8/30/11
Re: sum one column when a value in another column meets a criterion
Posted: Aug 2, 2012 5:27 AM
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example matrix:
x=[rand(5,1),round(rand(5,1))]

x_sum=sum(x(x(:,2)==1),1)

so i sum entries in first column, if entry in second column==1 ( ie. x(:,2)==1 returns a logical column matrix)



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