[Numpy-discussion] Problem using polyutils.mapdomain with fromfunction

[David Goldsmith]

On Sun, Jul 25, 2010 at 7:08 AM, Charles R Harris <charlesr.harris at gmail.com
> wrote:

>
> On Sun, Jul 25, 2010 at 2:32 AM, David Goldsmith <d.l.goldsmith at gmail.com>wrote:
>
>> Why am I being told my coefficient array is not 1-d when both coefficient
>> arrays--old and new--are reported to have shape (2L,):
>>
>> C:\Users\Fermat>python
>> Python 2.6.5 (r265:79096, Mar 19 2010, 18:02:59) [MSC v.1500 64 bit
>> (AMD64)] on
>> win32
>> Type "help", "copyright", "credits" or "license" for more information.
>> >>> import numpy as np
>> >>> np.version.version
>> '1.4.1'
>> >>> from numpy.polynomial import polyutils as pu
>> >>> nx = 1
>> >>> ny = 1
>> >>> def whydoesntthiswork(x, y):
>> ...     old = np.array((0,2)); print old.shape
>> ...     new = np.array((-1,1)); print new.shape
>> ...     X = pu.mapdomain(x, old, new)
>> ...     return X
>> ...
>> >>> result = np.fromfunction(whydoesntthiswork, (nx, ny))
>> (2L,)
>> (2L,)
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>>   File "C:\Python26\lib\site-packages\numpy\core\numeric.py", line 1539,
>> in from
>> function
>>     return function(*args,**kwargs)
>>   File "<stdin>", line 4, in whydoesntthiswork
>>   File "C:\Python26\lib\site-packages\numpy\polynomial\polyutils.py", line
>> 280,
>> in mapdomain
>>     [x] = as_series([x], trim=False)
>>   File "C:\Python26\lib\site-packages\numpy\polynomial\polyutils.py", line
>> 139,
>> in as_series
>>     raise ValueError("Coefficient array is not 1-d")
>> ValueError: Coefficient array is not 1-d
>>
>> Thanks in advance,
>>
>>
> Because fromfunction passes 2d arrays to  whydoesntthiswork and mapdomain
> doesn't accept 2d arrays as the first argument. That looks like an
> unnecessary restriction, open a ticket and I'll fix it up.
>

Thanks, Chuck.

DG


> Chuck
>
>
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