[Numpy-discussion] Numpy question

[Bruce Southey]

On 05/26/2011 10:13 AM, Derek Homeier wrote:
> On 26 May 2011, at 11:17, Talla wrote:
>
>> Below is the output of the coammands you mentioned.
>>
>> C:\>python
>> Python 2.6.2 (r262:71600, Jul  7 2009, 20:21:09) [MSC v.1500 32 bit
>> (Intel)] on win3
>> Type "help", "copyright", "credits" or "license" for more information.
>>>>> import numpy
>>>>> print(numpy.arange(3))
>> [0 1 2]
>> Which looks to me it is working just fine.
>>
>> so what is the problem though?
> Numpy is working with your Python2.6 and 2.7 installations, but as
> Pauli pointed out,
> the script you want to run instead is using instead a different and
> very ancient Python library,
> Numeric (which in its days occasionally was referred to as "NumPy",
> too, just to add
> confusion ;-).
> This means you could either try to
>
> - get Python2.4 to work on your machine and hope the Numeric binary
> works with it
>
> - compile Numeric from source for your Python2.6 or Python2.7
> installation (it actually
>     still builds with Python2.7), but this might be challenging for a
> beginner
>
> - try to modify your script to work with numpy instead. Numpy provides
> all the functionality
>     Numeric has ever offered afaik; its syntax is merely slightly
> different in a few cases.
>     You should find some helpful information here:
>
>       http://www.scipy.org/Converting_from_Numeric
>
>     (please note the caveats about the automatic converter!)
>     It might even be enough to replace the line in the script
>     File "AbinitBandStructureMaker.py", line 16, in<module>
>       from Numeric import *
>     with
>       from numpy.oldnumeric import *
>
>     ymmv - if you can contact the maintainer/original author of the
> script, you might ask
>     them for assistance - it does not make much sense to rely on a
> software package that
>     has not been maintained for half a decade, after all.
>
> HTH,
> 							Derek
>
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The source code does not appears to use many Numeric/numpy functions so 
it should be easy to convert to numpy. You can probably get away with by 
just importing what it needs:
from numpy import array

The 'AbinitStructureViewer.py' is a little more complex because it uses 
the old dtype with zeros(). So you will also have to import zeros as 
well ('from numpy import array, zeros') *and* change those calls such as:
'zeros(3,Int)' to 'zeros(3,int)'

For more details about converting see:
http://www.scipy.org/Converting_from_Numeric

Bruce