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

Groups > comp.lang.python > #78847 > unrolled thread

Re: strange numpy behaviour

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: strange numpy behaviour Ian Kelly <ian.g.kelly@gmail.com> - 2014-10-08 13:19 -0600

#78847 — Re: strange numpy behaviour

On Wed, Oct 8, 2014 at 10:29 AM, George Trojan <george.trojan@noaa.gov> wrote:
> This does not look right:
>
> dilbert@gtrojan> python3.4
> Python 3.4.1 (default, Jul  7 2014, 15:47:25)
> [GCC 4.8.3 20140624 (Red Hat 4.8.3-1)] on linux
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import numpy as np
>>>> a=np.ma.array([0, 1], dtype=np.int8, mask=[1, 0])
>>>> a
> masked_array(data = [-- 1],
>              mask = [ True False],
>        fill_value = 999999)
>
>>>> a.data
> array([0, 1], dtype=int8)
>>>> a.filled()
> array([63,  1], dtype=int8)         <------- Why 63?
>>>>
>
> What do you think?

The datatype is int8, the fill value is the default of 999999, and
999999 & 0xff == 63.

[toc] | [standalone]

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

csiph-web