determination between Inf and -Inf

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

Answer 1

[Azzi Abdelmalek]

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

[Azzi Abdelmalek]

Al-Hussein Abutaleb commented

Brilliant!

Thank you! A