[Numpy-discussion] calculating matrix values at particular indices?
Brian Blais
bblais at bryant.edu
Thu Feb 16 18:41:01 CST 2006
Hello,
In my attempt to learn python, migrating from matlab, I have the following problem.
Here is what I want to do, (with the wrong syntax):
from numpy import *
t=arange(0,20,.1)
x=zeros(len(t),'f')
idx=where(t>5)
tau=5
x[idx]=exp(-t[idx]/tau) # <---this line is wrong (gives a TypeError)
#------------------
what is the best way to replace the wrong line with something that works: replace all
of the values of x at the indices idx with exp(-t/tau) for values of t at indices idx?
I do this all the time in matlab scripts, but I don't know that the pythonic
preferred method is.
thanks,
bb
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bblais at bryant.edu
http://web.bryant.edu/~bblais
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