array from list of lists

Erin Sheldon erin.sheldon at gmail.com
Sun Nov 12 19:10:17 CST 2006


On 11/12/06, Erin Sheldon <erin.sheldon at gmail.com> wrote:
> On 11/12/06, Pierre GM <pgmdevlist at gmail.com> wrote:
> >
> > You could try the fromarrays function of numpy.core.records
> >
> > >>> mydescriptor = {'names': (a','b','c','d'), 'formats':('f4', 'f4', 'f4',
> > 'f4')}
> > >>> a = N.core.records.fromarrays(N.transpose(yourlist), dtype=mydescriptor)
> >
> > The 'transpose' function ensures that 'fromarrays' sees 4 arrays (one for each
> > column).

Actually, there is a problem with that approach.  It first converts
the entire array to a single type, by default a floating type.  For
very large integers this precision is insufficient.  For example, I
have the following integer in my arrays:
 94137100072000193L
which ends up as
  94137100072000192
after going to a float and then back to an integer.

Erin

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