asmatrix and asarray exception

Travis Oliphant oliphant at ee.byu.edu
Wed Oct 11 12:04:17 CDT 2006


Charles R Harris wrote:

>
>
> On 10/11/06, *Keith Goodman* <kwgoodman at gmail.com 
> <mailto:kwgoodman at gmail.com>> wrote:
>
>     On 10/11/06, Keith Goodman <kwgoodman at gmail.com
>     <mailto:kwgoodman at gmail.com>> wrote:
>     > This works:
>     >
>     > >> M.asmatrix(['a', 'b', None])
>     > matrix([[a, b, None]], dtype=object)
>     >
>     > But this doesn't:
>     >
>     > >> M.asmatrix(['a', 'b', None, 'c'])
>     > TypeError: expected a readable buffer object
>     >
>
>
> As a side observation, I note that the 'None' is also non-printing:
>
> >>> a = asarray(['a', 'b', None, 'c'], dtype=object)
> >>> a[2]
> >>> str(a[2])
> 'None'
>
> I wonder if this should be changed?

That's Python's decision.  You are getting back the None object when you 
access element a[2].  Thus, there is no way to change it.

-Travis


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