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sum of individual column values using logical operators

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Usman Mussadiq
Usman Mussadiq 2020-3-23
评论： Usman Mussadiq 2020-3-23
x=[2 1 ;-1 1 ;-1 2 ;1 -1 ;5 -1 ]
ind = x(:,2)<0
C = abs(sum(x(ind)))
ind = x(:,2)>0
D= abs(sum(x(ind)))
here, i need only sum of all rows and second column logical values, while it gives the whole if i remove (:,2) and answer will be not appropriate when i add this one. please guide me

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