determination between Inf and -Inf

2016 7 22
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Hello,
I have a matrix that contains both inf and -inf points. I'm currently using isinf() to find the locations of these points however I have no way of knowing whether it's -inf or +inf.
The reason for this is because I later replace each inf with a predetermine value (5000) and I would like to be able to replace -inf with -5000 (but so far I haven't been able to detect them. Sample code below:
data(isinf(data)) = max(model.ub); %the max here will return 5000;
Thanks Al

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Azzi Abdelmalek
Azzi Abdelmalek 2016-7-22
编辑：Azzi Abdelmalek 2016-7-22

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a=[1 2 inf 3 -inf -4]
idx=isinf(a)
sign(a(idx))

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