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Re: readcol procedure [message #32080 is a reply to message #32020]

Wed, 11 September 2002 07:54

Wayne Landsman
Messages: 117
Registered: January 1997

Senior Member

Reimar Bauer wrote:

> this routine is platform dependent because it uses a unix shell command.
> I like unix but it's not a problem for idl to determine this itselfs.

numlines.pro (http://idlastro.gsfc.nasa.gov/ftp/pro/misc/numlines.pro called by readcol.pro) only
spawns to the Unix 'wc' command if !VERSION.OS equals 'unix' (for speed). Otherwise it counts the
number of lines.

> Perhaps you can try the routine file_line I have defined in 1996 and
> which was improved later by Paul Krummel. You can find this routine by
> David at http://www.dfanning.com/tip_examples/file_line.pro

Hmm, I would have thought that reading the entire file into a byte array simply to count the number
of lines would be overkill. But in my quick tests, file_line.pro does seem to be faster than
counting the number of lines, and almost as fast (on Unix) as spawning to 'wc'.

I have heard a rumor that there may be a standardized way of counting the number of lines in a file
in the next release of IDL ;-)

--Wayne

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[Message index]

		readcol procedure By: shih I Chun on Tue, 10 September 2002 10:15
		Re: readcol procedure By: Liam E. Gumley on Thu, 12 September 2002 08:43
		Re: readcol procedure By: R.Bauer on Thu, 12 September 2002 11:39
		Re: readcol procedure By: David Fanning on Thu, 12 September 2002 08:59
		Re: readcol procedure By: R.Bauer on Wed, 11 September 2002 23:42
		Re: readcol procedure By: David Fanning on Wed, 11 September 2002 14:12
		Re: readcol procedure By: Wayne Landsman on Wed, 11 September 2002 07:54
		Re: readcol procedure By: R.Bauer on Tue, 10 September 2002 23:33
		Re: readcol procedure By: Don J Lindler on Tue, 10 September 2002 13:30
		Re: readcol procedure By: R.Bauer on Sun, 15 September 2002 08:16
		Re: readcol procedure By: Pavel A. Romashkin on Fri, 13 September 2002 12:30
		Re: readcol procedure By: R.Bauer on Fri, 13 September 2002 10:43
		Re: readcol procedure By: Pavel A. Romashkin on Fri, 13 September 2002 09:36
		Re: readcol procedure By: David Fanning on Fri, 13 September 2002 08:50
		Re: readcol procedure By: Pavel A. Romashkin on Fri, 13 September 2002 08:39
		Re: readcol procedure By: R.Bauer on Thu, 12 September 2002 14:05
		Re: readcol procedure By: Liam E. Gumley on Thu, 12 September 2002 12:11

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