[Numpy-discussion] conditional array indexing
Michaell Taylor
michaell.taylor at reis.com
Mon Jan 28 12:58:04 CST 2002
Very new user to Numpy, so excuse the question. It relates to a fundamental
issue which I have having trouble getting a grip on.
Specifically, say I have the following:
a = ([1,2,1,2,4,3,1,2,3,2,3,2])
b = ([4,3,5,2,4,5,3,6,3,2,5,6])
c = random variable of length=len(b)
I would like to get the value of C associated with the lowest value of b
within groupings of a. That is, there are three incidents of "1" in the a
array. The lowest value of b associated with the value 1 in the a index is
"3". This occurs in index value 6 on the a and b arrays. Now, I would like
to then know the value of c[6].
Obviously the real problem is far more complex with len(a)==5000.
Any ideas?
Thanks in advance.
Michaell
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