Re: [Numpy-discussion] numpy.array(arr.flat) mutates arr if arr.flags.fortran: bug?
You should open a ticket for this.
http://projects.scipy.org/numpy/ticket/1439
On Mar 26, 2010, at 11:26 AM, Charles R Harris wrote:
On Wed, Mar 24, 2010 at 1:13 PM, Zachary Pincus zachary.pin...@yale.edu
wrote:
Hello,
I assume it is a bug that calling numpy.array() on a flatiter of a
fortran-strided array that owns its own data causes that array to be
rearranged somehow?
Not sure what happens with a fancier-strided array that also owns its
own data (because I'm not sure how to create one of those in python).
This is from the latest svn version (2.0.0.dev8302) but was also
present in a previous version too.
Zach
In [9]: a = numpy.array([[1,2],[3,4]]).copy('F')
In [10]: a
Out[10]:
array([[1, 2],
[3, 4]])
In [11]: list(a.flat)
Out[11]: [1, 2, 3, 4]
In [12]: a # no problem
Out[12]:
array([[1, 2],
[3, 4]])
In [13]: numpy.array(a.flat)
Out[13]: array([1, 2, 3, 4])
In [14]: a # this ain't right!
Out[14]:
array([[1, 3],
[2, 4]])
In [15]: a = numpy.array([[1,2],[3,4]]).copy('C')
In [16]: numpy.array(a.flat)
Out[16]: array([1, 2, 3, 4])
In [17]: a
Out[17]:
array([[1, 2],
[3, 4]])
You should open a ticket for this.
Chuck
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Re: [Numpy-discussion] numpy.array(arr.flat) mutates arr if arr.flags.fortran: bug?
On Wed, Mar 24, 2010 at 1:13 PM, Zachary Pincus zachary.pin...@yale.eduwrote:
Hello,
I assume it is a bug that calling numpy.array() on a flatiter of a
fortran-strided array that owns its own data causes that array to be
rearranged somehow?
Not sure what happens with a fancier-strided array that also owns its
own data (because I'm not sure how to create one of those in python).
This is from the latest svn version (2.0.0.dev8302) but was also
present in a previous version too.
Zach
In [9]: a = numpy.array([[1,2],[3,4]]).copy('F')
In [10]: a
Out[10]:
array([[1, 2],
[3, 4]])
In [11]: list(a.flat)
Out[11]: [1, 2, 3, 4]
In [12]: a # no problem
Out[12]:
array([[1, 2],
[3, 4]])
In [13]: numpy.array(a.flat)
Out[13]: array([1, 2, 3, 4])
In [14]: a # this ain't right!
Out[14]:
array([[1, 3],
[2, 4]])
In [15]: a = numpy.array([[1,2],[3,4]]).copy('C')
In [16]: numpy.array(a.flat)
Out[16]: array([1, 2, 3, 4])
In [17]: a
Out[17]:
array([[1, 2],
[3, 4]])
You should open a ticket for this.
Chuck
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Re: [Numpy-discussion] numpy.array(arr.flat) mutates arr if arr.flags.fortran: bug?
On Mar 24, 2010, at 2:13 PM, Zachary Pincus wrote: Hello, I assume it is a bug that calling numpy.array() on a flatiter of a fortran-strided array that owns its own data causes that array to be rearranged somehow? Not sure what happens with a fancier-strided array that also owns its own data (because I'm not sure how to create one of those in python). This is from the latest svn version (2.0.0.dev8302) but was also present in a previous version too. Hmm.. Yeah, this doesn't seem right. I'm not really sure what array(a.flat) should return since a.flat is an iterator... but what it's doing is not right. -Travis ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
[Numpy-discussion] numpy.array(arr.flat) mutates arr if arr.flags.fortran: bug?
Hello,
I assume it is a bug that calling numpy.array() on a flatiter of a
fortran-strided array that owns its own data causes that array to be
rearranged somehow?
Not sure what happens with a fancier-strided array that also owns its
own data (because I'm not sure how to create one of those in python).
This is from the latest svn version (2.0.0.dev8302) but was also
present in a previous version too.
Zach
In [9]: a = numpy.array([[1,2],[3,4]]).copy('F')
In [10]: a
Out[10]:
array([[1, 2],
[3, 4]])
In [11]: list(a.flat)
Out[11]: [1, 2, 3, 4]
In [12]: a # no problem
Out[12]:
array([[1, 2],
[3, 4]])
In [13]: numpy.array(a.flat)
Out[13]: array([1, 2, 3, 4])
In [14]: a # this ain't right!
Out[14]:
array([[1, 3],
[2, 4]])
In [15]: a = numpy.array([[1,2],[3,4]]).copy('C')
In [16]: numpy.array(a.flat)
Out[16]: array([1, 2, 3, 4])
In [17]: a
Out[17]:
array([[1, 2],
[3, 4]])
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