| Re: array indices again [message #15723 is a reply to message #15631] |
Thu, 03 June 1999 00:00  |
Martin Schultz
Messages: 515
Registered: August 1997
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Senior Member |
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Henry Chapman wrote:
>
> Hi all,
>
> I remember a few weeks back there was a lot of discussion about indexing
> multiple dimensions of arrays, [...]
> It seems that by extending the 2-d array a into another dimension, where
> the extra dimension has no size (sounds like string theory!) the
> indexing works the way I want it to. I noticed this when I had a 3-d
> array and was extracting a 2-d array from it, as in b[x, x, i] where x
> is a 1-d array and i is a scalar. This seems to work on arrays of any
> dimension.
>
> I apologise if this was mentioned before,
>
> Henry.
>
> --
> Henry Chapman mailto:chapman9@llnl.gov
> Information Science & Technology Program
> Lawrence Livermore National Lab
> L-395, 7000 East Ave., Livermore CA 94550
Henry,
nice feature! I was really astonished when I saw it works even for
non-equal dimensions:
a = findgen(20,10)
x = indgen(10)*2
y = indgen(5)*2
print,a[x,y,0]
however, (a puzzle for the unexperienced IDL user):
print,a[x,y]
will result in an error message...
Martin.
--
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Martin Schultz, DEAS, Harvard University, 29 Oxford St., Pierce 109,
Cambridge, MA 02138 phone (617) 496 8318 fax (617) 495 4551
e-mail mgs@io.harvard.edu web http://www-as/people/staff/mgs/
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