[Numpy-discussion] when did column_stack become C-contiguous?

[josef.pktd at gmail.com]

On Mon, Oct 19, 2015 at 1:10 AM, Stephan Hoyer <shoyer at gmail.com> wrote:

> Looking at the git logs, column_stack appears to have been that way
> (creating a new array with concatenate) since at least NumPy 0.9.2, way
> back in January 2006:
> https://github.com/numpy/numpy/blob/v0.9.2/numpy/lib/shape_base.py#L271
>

Then it must have been changed somewhere else between 1.6.1 amd 1.9.2rc1

I have my notebook and my desktop with different numpy and python versions
next to each other and I don't see a typo in my command.

I assume python 2.7 versus python 3.4 doesn't make a difference.

------------------

>>> np.column_stack((np.ones(10), np.ones(10))).flags
  C_CONTIGUOUS : False
  F_CONTIGUOUS : True
  OWNDATA : False
  WRITEABLE : True
  ALIGNED : True
  UPDATEIFCOPY : False

>>> np.__version__
'1.6.1'
>>> import sys
>>> sys.version
'2.7.1 (r271:86832, Nov 27 2010, 18:30:46) [MSC v.1500 32 bit (Intel)]'

----------------

>>> np.column_stack((np.ones(10), np.ones(10))).flags
  C_CONTIGUOUS : True
  F_CONTIGUOUS : False
  OWNDATA : True
  WRITEABLE : True
  ALIGNED : True
  UPDATEIFCOPY : False

>>> np.__version__
'1.9.2rc1'
>>> import sys
>>> sys.version
'3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:44:40) [MSC v.1600 64 bit
(AMD64)]'

---------------------------

comparing all flags, owndata also has changed, but I don't think that has
any effect

Josef


>
>
> Stephan
>
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