[Numpy-discussion] extremely slow array indexing?
robert.kern at gmail.com
Thu Nov 30 11:28:45 CST 2006
Fang Fang wrote:
> I am writing code to sort the columns according to the sum of each
> column. The dataset is huge (50k rows x 300k cols), so i have to read
> line by line and do the summation to avoid the out-of-memory problem.
> But I don't know why it runs very slow, and part of the code is as
> follows. Can anyone point out what needs to be modified to make it run
> fast? thanks in advance!
Nothing leaps out. Generally, it's difficult (or impossible) to answer such
questions without running code. Can you distill the time-consuming part into a
small, self-contained script with fake data that we can run?
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
More information about the Numpy-discussion