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Old 05-12-2005, 03:00 PM   #1
Registered: Nov 2003
Location: Ohio
Distribution: Debian Unstable
Posts: 460

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Question array logical operations in python?

Hi all,

Are there any python libraries that implement functionality similar to logical array operations in MATLAB? For example in matlab

x = 1:10
x(x>5) = 0
will output

x =

  1  2  3  4  5  0  0  0  0  0
where x>5 gives the logical array where x is greater than 5

x>5 =
  0 0 0 0 0 1 1 1 1 1
I know I can accomplish the same goal with for/if/else, but array operations should be significantly faster. Thanks for any thoughts.

Last edited by zero79; 05-12-2005 at 03:02 PM.
Old 05-12-2005, 03:14 PM   #2
Registered: Nov 2003
Location: Ohio
Distribution: Debian Unstable
Posts: 460

Original Poster
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Ok, I think I found what I am looking for


from Numeric import *
x = array((1,2,3,4,5,6,7,8,9,10))
print where(greater(x,5),x,0)
Old 05-13-2005, 03:56 AM   #3
Registered: Oct 2004
Location: Yogyakarta, Indonesia
Distribution: Mandrake 9.0, 9.1, 9.2, 10.0
Posts: 84

Rep: Reputation: 16
It could be like this....

x = range(1,10)
x = [j for j in (x[:5]+[0 for k in range(4)])]

Agus Dwi Basuki


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