[Numpy-discussion] Variable in an array name?
Paul Anton Letnes
paul.anton.letnes at gmail.com
Wed Jan 12 11:02:46 EST 2011
On 12. jan. 2011, at 16.40, dstaley wrote:
>
>
> Zachary Pincus-2 wrote:
>>
>>> Is it possible to use a variable in an array name? I am looping
>>> through a
>>> bunch of calculations, and need to have each array as a separate
>>> entity.
>>> I'm pretty new to python and numpy, so forgive my ignorance. I'm
>>> sure there
>>> is a simple answer, but I can't seem to find it.
>>>
>>> let's say i have a variable 'i':
>>>
>>> i = 5
>>>
>>> I would like my array to have the name array5
>>>
>>> I know how I could do this manually, but not in a loop where i is
>>> redefined
>>> several times.
>>
>> There are ways to do this, but what you likely actually want is just
>> to put several arrays in a python list and then index into the list,
>> instead of constructing numbered names.
>>
>> e.g.:
>>
>> array_list = []
>>
>> for whatever:
>> array_list.append(numpy.array(whatever))
>>
>> for array in array_list:
>> do_something(array)
>>
>> given_array = array_list[i]
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>>
>>
>
>
> Thank you very much for the prompt response. I have already done what you
> have suggested, but there are a few cases where I do need to have an array
> named with a variable (looping through large numbers of unrelated files and
> calculations that need to be dumped into different analyses). It would be
> extraordinarily helpful if someone could post a solution to this problem,
> regardless of inefficiency of the method. Thanks a ton for any additional
> help.
> --
This may be obvious, but I sometimes forget myself: have you tried python dicts?
>>> from numpy import *
>>> a = linspace(0,10)
>>> b = a.copy()
>>> d = {'array1':a, 'array2':b}
>>> for key in d:
... dosomething(d[key])
That way, you can assign a name / key for each array variable, and use this name for file names, or whatever you need names for.
Cheers
Paul.
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