[SciPy-dev] numpyio.io problem

Travis Oliphant oliphant at ee.byu.edu
Wed Oct 19 22:24:44 CDT 2005

Stephen Walton wrote:

>My last Bug of the Day, which is also triggered by the first test in 
>test_array_import.py, shows that numpyio.fwrite will not convert a real 
>array to shorts before writing them out.  Note the last line succeeds in 
>writing ints.  Is this new/old/desired behavior?
>In [1]:import scipy
>Importing io to scipy
>Importing special to scipy
>Importing utils to scipy
>Importing interpolate to scipy
>Importing optimize to scipy
>Importing linalg to scipy
>In [2]:import scipy.io.numpyio as numpyio
>In [3]:a=255*scipy.rand(20)
>In [4]:fid=open('foo','wb+')
>In [5]:numpyio.fwrite(fid,20,a,'s')
>exceptions.ValueError                                Traceback (most 
>recent call last)
>ValueError: Invalid type for array
's' is no longer the typecode character for "short".  You are looking 
for 'h' here.  This is the character used by the struct module.  I guess 
it means 'half' or something.

numpyio needs to be updated to take actual type objects and not just 
character.  It is not a difficult fix, since PyArray_TypecodeConverter 
is available in the new C-API.


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