array multiplication with a negative value

2014 6 11
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更新时间：2014 6 11
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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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