array multiplication with a negative value

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Bathrinath
Bathrinath 2014-6-11
评论： Bathrinath 2014-6-11
A=[0,-2.2,-3.3,-25;1.2,0,-1.1,12;2,-8,8,0] my answer is to be A=[0,-2.2,-3.3,-25;-1.2,0,-1.1,-12;-2,-8,-8,0]. I need to convert the values in A which is greater than zero as -A. I have used if A(A > 0) A=-A; end This is not working. Suggest some points

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Andrei Bobrov
Andrei Bobrov 2014-6-11
编辑：Andrei Bobrov 2014-6-11
t = A > 0;
A(t) = -A(t);
or
A = -abs(A);

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