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Re: string manipulation [message #23966 is a reply to message #23898]

Tue, 27 February 2001 13:29

landsman
Messages: 93
Registered: August 1991

Member

In article <on66hxm5tk.fsf@cow.physics.wisc.edu>, craigmnet@cow.physics.wisc.edu writes...
> This is primarily because STRMID and STRPUT are not
> vectorized at all. Well STRMID *is* vectorized, but not with a sane
> behavior. For example, what I'd like to do is:
>
> NEWKEY = STRMID(KEY,0,P1) + '50' + STRMID(KEY,P2,100)
> NEWKEY = STRMID(KEY,0,P1) + '50' + STRMID(KEY,P2,100)
>
> Where KEY, P1, and P2 are vectors. Obviously this doesn't work. Any
> ideas?

The problem when STRMID was vectorized for V5.3 was that it was made *too*
powerful -- it handles simultaneously both extraction from multiple strings
and multiple extractions from a single string. In practice, I think the
first situation -- extraction from multiple strings -- is far more common, but
has an ugly syntax in the current STRMID implementation. Here is how one
does the example above.

N = N_elements(KEY)
NEWKEY = STRMID(KEY,INTARR(1,N),REFORM(P1,1,N)) + '50' + $
STRMID(KEY,REFORM(P2,1,N), REPLICATE(100,1,N) )

I have thought about writing a simple wrapper around STRMID (say STRMIDV) that
would have a simpler syntax for the case of single extractions from
multiple strings.

--Wayne Landsman landsman@mpb.gsfc.nasa.gov

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[Message index]

		string manipulation By: Craig Markwardt on Mon, 26 February 2001 14:34
		Re: string manipulation By: Kenneth P. Bowman on Wed, 28 February 2001 16:16
		Re: string manipulation By: Pavel A. Romashkin on Thu, 01 March 2001 11:54
		Re: string manipulation By: Mark Hadfield on Wed, 28 February 2001 12:30
		Re: string manipulation By: John-David T. Smith on Tue, 27 February 2001 16:35
		Re: string manipulation By: davidf on Tue, 27 February 2001 15:34
		Re: string manipulation By: Mark Hadfield on Tue, 27 February 2001 15:02
		Re: string manipulation By: John-David T. Smith on Tue, 27 February 2001 14:40
		Re: string manipulation By: landsman on Tue, 27 February 2001 13:29

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