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Re: very simple Index question~~~help~~~ [message #62545 is a reply to message #62544]

Mon, 15 September 2008 20:49

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

xiao writes:

> I have a very simple question , I have an 178*300 array, I want to
> read it line by line like this :
>
> print,diff(53399)
> print,diff(178*299+177) ;178*299+177=53399
>
> for i=0,177 do begin
> diff2(i)= diff(178*299+i)
> endfor
>
>
> Why it always remind me that it out of range in the second print
> statement. I mean 178*299+177 s exactly equal to 53399.

IDL arrays are indexed starting from 0 and not 1. If you
get to 53399, you have exceeded the bounds of the array,
which go from index 0 to 53398.

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: very simple Index question~~~help~~~ By: R.G. Stockwell on Tue, 16 September 2008 09:35
		Re: very simple Index question~~~help~~~ By: xiao zhang on Tue, 16 September 2008 08:54
		Re: very simple Index question~~~help~~~ By: Carsten Lechte on Tue, 16 September 2008 01:22
		Re: very simple Index question~~~help~~~ By: xiao zhang on Tue, 16 September 2008 00:09
		Re: very simple Index question~~~help~~~ By: David Fanning on Mon, 15 September 2008 20:59
		Re: very simple Index question~~~help~~~ By: xiao zhang on Mon, 15 September 2008 20:56
		Re: very simple Index question~~~help~~~ By: David Fanning on Mon, 15 September 2008 20:49

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