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Re: newbie's question [message #53404 is a reply to message #45924]

Sat, 14 April 2007 11:08

geonline714
Messages: 7
Registered: April 2007

Junior Member

Dear David,

Thank you for your detailed explanation. Now it works. :)

Have a great weekend!

Sincerely,
Qi
On Apr 14, 10:04 am, David Fanning <n...@dfanning.com> wrote:
> geonline...@gmail.com writes:
>> I tried to run a script like this (stored in test.pro):
>
>> array = ['one', 'two', 'three']
>> print, array
>> n = N_ELEMENTS(array)
>> print, n
>> FOR i=0,n-1 DO BEGIN
>> PRINT, array[i]
>> ENDFOR
>
>> However, I got error message as follows:
>
>> IDL> @test
>> one two three
>> 3
>> Attempt to subscript ARRAY with I is out of range.
>> Execution halted at: $MAIN$
>
>> ENDFOR
>> ^
>> Syntax error.
>> At: E:\temp\test.pro, Line 7
>
>> This is an example from IDL. Do you have any idea about what is going
>> on?
>
> The @ sign attempts to read the instructions in the file
> as if you were typing them at the IDL command line. That
> is, one after the other. But, it is VERY difficult to
> write multiple line commands, such as in your FOR loop,
> at the IDL command line. You will need line continuation
> and line concatenation symbols to do so. NO ONE WANTS TO
> DO THAT!
>
> So, what you want to do is compile this bunch of commands
> you have FIRST, then execute that. BUT, in order to make
> these command compilable, there has to be an END statement
> at the end of the commands, so the compiler knows where
> to stop. That is what is missing in your code (and is
> probably what you have left out of the example).
>
> What you want to do with this code is add an END statement.
> Then compile the commands:
>
> IDL> .compile test
>
> Then run this main-level program:
>
> IDL> .go
>
> 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]

		Newbie's question By: ChiChiRuiz@gmail.com on Wed, 19 October 2005 15:06
		Re: Newbie's question By: James Kuyper on Fri, 21 October 2005 15:06
		Re: Newbie's question By: ChiChiRuiz@gmail.com on Fri, 21 October 2005 11:22
		Re: Newbie's question By: James Kuyper on Fri, 21 October 2005 10:29
		Re: Newbie's question By: James Kuyper on Fri, 21 October 2005 10:19
		Re: Newbie's question By: JD Smith on Fri, 21 October 2005 09:35
		Re: newbie's question By: geonline714 on Sat, 14 April 2007 11:08
		Re: newbie's question By: David Fanning on Sat, 14 April 2007 10:04

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