Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #79258 > unrolled thread

Re: Extract Indices of Numpy Array Based on Given Bit Information

Back to article view | Back to comp.lang.python

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: Extract Indices of Numpy Array Based on Given Bit Information Chris Angelico <rosuav@gmail.com> - 2014-10-18 17:50 +1100

#79258 — Re: Extract Indices of Numpy Array Based on Given Bit Information

On Sat, Oct 18, 2014 at 5:42 PM, Artur Bercik <vbubbly21@gmail.com> wrote:
> I got some sense, but could not imagine if required Bit No. 2–5, and  Bit
> Combination 0000.
>
> I hope example with the new case would make me more sense.
>

Just write the number in binary, with the bits you're interested in
set to 1, and everything else 0:

... 876543210
... 000111100

>>> 0b000111100
60
>>> 1073741877 & 0b000111100
52

So this number does _not_ have all zeroes there. If it did, the result
would be zero. To look for some other pattern, just do the same thing
- suppose we want to find numbers where it's 1001, we just look for
the result to be 0b000100100, or 36.

ChrisA

[toc] | [standalone]

Back to top | Article view | comp.lang.python

csiph-web