[SciPy-user] Save a list of arrays

[Ryan May]

On Wed, Apr 22, 2009 at 9:19 AM, Mathieu Dubois <mathieu.dubois at limsi.fr>wrote:

> Pauli Virtanen wrote:
> > Wed, 22 Apr 2009 15:09:20 +0200, Mathieu Dubois kirjoitti:
> >
> >
> >> [I have posted this message this morning but apparently it is stuck
> >> somewhere - sorry for multi-posting]
> >>
> >> Hello,
> >>
> >> I would like to save a list of arrays (each one has a different shape)
> >> to a file.
> >> For instance:
> >>  >>> array1 = numpy.ones(2);
> >>  >>> array2 = numpy.ones(5);
> >>  >>> array3 = numpy.ones(1000);
> >>  >>> list = [array1, array2, array3]
> >>
> >> As my arrays are huge (each one contains several thousands values) I
> >> would like a compressed file.
> >> numpy.savez would be perfect (because it produces an archive of binary
> >> files) but unfortunately numpy.savez(list) doesn't work because savez
> >> needs each array individually.
> >>
> >> So what's the best way to do that?
> >>
> >
> >
> Hello Pauli,
> > savez(filename, *list)
> >
> > The star is Python syntax for unpacking a sequence to arguments
> Thank you for the tip this opens interesting possibilities.
>
> Do you know something that works with named arguments (keyword arguments)?
> This would allow to set the name of the array in the archive file (by
> default it's 'arr_0.npy').
>

A dictionary and two stars:

arrays = {'a':a, 'b':b, 'c':c}
savez(filename, **arrays)

Ryan

-- 
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
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