[Numpy-discussion] nonuniform scatter operations
Geoffrey Irving
irving at naml.us
Sun Sep 28 00:34:22 EDT 2008
Hello,
Is there an efficient way to implement a nonuniform gather operation
in numpy? Specifically, I want to do something like
n,m = 100,1000
X = random.uniform(size=n)
K = random.randint(n, size=m)
Y = random.uniform(size=m)
for k,y in zip(K,Y):
X[k] += y
but I want it to be fast. The naive attempt "X[K] += Y" does not
work, since the slice assumes the indices don't repeat.
Thanks,
Geoffrey
More information about the NumPy-Discussion
mailing list