[Numpy-discussion] String manipulation

David Goldsmith d_l_goldsmith@yahoo....
Wed Jul 22 13:38:45 CDT 2009


By the way, Chris, what's it gonna take to get you contributing to the doc? ;-)

DG

--- On Wed, 7/22/09, Christopher Barker <Chris.Barker@noaa.gov> wrote:

> From: Christopher Barker <Chris.Barker@noaa.gov>
> Subject: Re: [Numpy-discussion] String manipulation
> To: "Discussion of Numerical Python" <numpy-discussion@scipy.org>
> Date: Wednesday, July 22, 2009, 11:33 AM
> Stéfan van der Walt wrote:
> > You cannot use view on an array scalar, so you'll have
> to convert to
> > an array first:
> > 
> > x = x.reshape((1,))
> > x.view('S1')
> 
> Bingo!
> 
> Thanks, Stéfan.
> 
> I don't know why one can't uwe view on a scalar -- there is
> still a dat pointer isn't there?, and it can be reshaped.
> Butno matter, now I have a  one liner that splits a
> string up into fixed fields, and returns a float array of
> the numbers in those fields:
> 
> np.array((line,)).view(dtype='S%i'%field_len).astype(np.float)
> 
> I suspect this is faster than the list comp method, though
> I haven't tested it -- I"ll leave that to someone that
> actually has this problem to solve ;-)
> 
> I've enclosed a bit of test code with a few other
> approaches as well.
> 
> -Chris
> 
> 
> 
> 
> -- Christopher Barker, Ph.D.
> Oceanographer
> 
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> 
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