[Numpy-discussion] Matlab page on scipy wiki
Colin J. Williams
cjw at sympatico.ca
Fri Feb 10 07:14:07 EST 2006
Alan G Isaac wrote:
>On Fri, 10 Feb 2006, Stefan van der Walt apparently wrote:
>
>
>>In Octave that would be
>>[1, 0, 1:4, 0, 1]
>>Using numpy we currently do
>>concatenate([[1, 0], arange(1,5), [0, 1]]) or
>>vstack(...)
>>
>>
>
>numpy.r_[1,0,range(1,5),0,1]
>
>fwiw,
>Alan Isaac
>
>
This seems to be a neat idea but not in the usual Python style.
>>> help(numpy.r_)
Help on concatenator in module numpy.lib.index_tricks object:
class concatenator(__builtin__.object)
| Translates slice objects to concatenation along an axis.
|
| Methods defined here:
|
| __getitem__(self, key)
|
| __getslice__(self, i, j)
|
| __init__(self, axis=0, matrix=False)
|
| __len__(self)
|
| ----------------------------------------------------------------------
| Data and other attributes defined here:
|
| __dict__ = <dictproxy object>
| dictionary for instance variables (if defined)
|
| __weakref__ = <attribute '__weakref__' of 'concatenator' objects>
| list of weak references to the object (if defined)
The help refers to concatenator, presumably r_ is a synonym, but that
name is not
available to the user:
>>> numpy.concatenator
Traceback (most recent call last):
File "<interactive input>", line 1, in ?
AttributeError: 'module' object has no attribute 'concatenator'
>>>
If r_ is a class, couldn't it have have a more mnemonic name and, in the
usual
Python style, start with an upper case letter?
help(numpy.r_.__init__)
Help on method __init__ in module numpy.lib.index_tricks:
__init__(self, axis=0, matrix=False) unbound
numpy.lib.index_tricks.concatenator method
>>>
Colin W.
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