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detecting a sign change in a vector


From: dirac
Subject: detecting a sign change in a vector
Date: Thu, 31 Jan 2013 09:52:29 -0800 (PST)

Hi there people,

This might be trivial but I am stuck on this.
I have a vector, V, which basically contains the values of a cos/sin
function. The signs of the elements in the vector change from + to -
occasionally. I would like to find these points without using a loop as I
have done in the past. Is there a way to do this?

Thanks
MA



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