picking rows which has negative element.

2013 4 17
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hi, i have a matrix which can have negative elements. is ther eq quick and efficient way to pick the rows if any element in the row has negative values.
Thanks

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Iman Ansari
Iman Ansari 2013-4-17

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Hi
a=randn([5 5])+1
Nrows=sum(a<0,2);
a(Nrows>0,:)

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Kaushik
Kaushik 2013-4-17
this is not correct. because the sum of the elements along dimension 2 can be positive while there exists a negative element present. may be i should clarify my question. i want to pick a row if the row has a negative element (the row may have mixture of positive and negative elements)
Iman Ansari
Iman Ansari 2013-4-17
sum(a<0,2) is number of negative elements in each row. a<0 is one for negative values and 0 for others.

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