Indexing negative and positive elements of a vector

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Marcin 2013-6-24

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Hello, I want to find a more elegant way of indexing positive and negative elements of a vector. Here is what I have so far. I have a vector of numbers (Vec1) and I would like to find a coresponding vector where the logical indexing assigns 1 to positive numbers and -1 to negative numbers.

e.g.

Vec1 = [-0.2 0.3 0.5 0.7 -0.4 0.5 -0.5]
PosInd = Vec1 > 0;
NegInd = (Vec1 < 0)*(-1);
IndVec = PosInd + NegInd;

IndVec is = [-1 1 1 1 -1 1 -1]

Is there a nicer (and more direct) way to do that?

Thanks in advance,

Martin

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Jonathan Sullivan 2013-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/80060-indexing-negative-and-positive-elements-of-a-vector#answer_89758

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Marcin 2013-6-24

Ouah! Great!!! Thanks so much!

Marcin

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