Hello everyone,

i have a 10×2 matrix. i want to sum all the elements in the first column while the second column has the negative values. for the example matrix below,

i want a b matrix that gives me 2+4+4 result. (2,4 and 4 are the first column numbers which has negative numbers in the second column)

`A=[2 -3;4 -4;5 3;4 -2;5 4;1 3];`

I hope you can help me, thank you all!!!

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