Re: [Numpy-discussion] Structured array sorting
On Mon, Jan 18, 2010 at 6:39 AM, Thomas Robitaille < [email protected]> wrote: > > > Warren Weckesser-3 wrote: > > > > Looks like 'sort' is not handling endianess of the column data > > correctly. If you change the type of the floating point data to ' > the sort works. > > > > Thanks for identifying the issue - should I submit a bug report? > > Yes. Chuck ___ NumPy-Discussion mailing list [email protected] http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Structured array sorting
Warren Weckesser-3 wrote: > > Looks like 'sort' is not handling endianess of the column data > correctly. If you change the type of the floating point data to ' the sort works. > Thanks for identifying the issue - should I submit a bug report? Thomas -- View this message in context: http://old.nabble.com/Structured-array-sorting-tp27200785p27210615.html Sent from the Numpy-discussion mailing list archive at Nabble.com. ___ NumPy-Discussion mailing list [email protected] http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Structured array sorting
Looks like 'sort' is not handling endianess of the column data
correctly. If you change the type of the floating point data to 'i2')])
In [141]: z.sort(order='num')
In [142]: z
Out[142]:
array([(255,), (0,), (256,), (1,), (258,)],
dtype=[('num', '>i2')])
In [143]: np.__version__
Out[143]: '1.3.0'
-
Sorting works as expected with a simple array of short ints:
-
In [152]: w = np.array([0,258, 3, 255], dtype=' I am having trouble sorting a structured array - in the example below,
> sorting by the first column (col1) seems to work, but not sorting by the
> second column (col2). Is this a bug?
>
> I am using numpy svn r8071 on MacOS 10.6.
>
> Thanks for any help,
>
> Thomas
>
> Python 2.6.1 (r261:67515, Jul 7 2009, 23:51:51)
> [GCC 4.2.1 (Apple Inc. build 5646)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>
import numpy as np
data = np.array([('a ', 2.), ('b', 4.), ('d', 3.), ('c', 1.)],
> ... dtype=[('col1', '|S5'), ('col2', '>f8')])
>
data
> array([('a ', 2.0), ('b', 4.0), ('d', 3.0), ('c', 1.0)],
> dtype=[('col1', '|S5'), ('col2', '>f8')])
>
data.sort(order=['col1'])
data
> array([('a ', 2.0), ('b', 4.0), ('c', 1.0), ('d', 3.0)],
> dtype=[('col1', '|S5'), ('col2', '>f8')])
>
data.sort(order=['col2'])
data
> array([('a ', 2.0), ('d', 3.0), ('b', 4.0), ('c', 1.0)],
> dtype=[('col1', '|S5'), ('col2', '>f8')])
>
>
> ___
> NumPy-Discussion mailing list
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>
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[Numpy-discussion] Structured array sorting
I am having trouble sorting a structured array - in the example below, sorting
by the first column (col1) seems to work, but not sorting by the second column
(col2). Is this a bug?
I am using numpy svn r8071 on MacOS 10.6.
Thanks for any help,
Thomas
Python 2.6.1 (r261:67515, Jul 7 2009, 23:51:51)
[GCC 4.2.1 (Apple Inc. build 5646)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy as np
>>> data = np.array([('a ', 2.), ('b', 4.), ('d', 3.), ('c', 1.)],
... dtype=[('col1', '|S5'), ('col2', '>f8')])
>>>
>>> data
array([('a ', 2.0), ('b', 4.0), ('d', 3.0), ('c', 1.0)],
dtype=[('col1', '|S5'), ('col2', '>f8')])
>>> data.sort(order=['col1'])
>>> data
array([('a ', 2.0), ('b', 4.0), ('c', 1.0), ('d', 3.0)],
dtype=[('col1', '|S5'), ('col2', '>f8')])
>>> data.sort(order=['col2'])
>>> data
array([('a ', 2.0), ('d', 3.0), ('b', 4.0), ('c', 1.0)],
dtype=[('col1', '|S5'), ('col2', '>f8')])
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