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Re: Begin statement [message #3260 is a reply to message #3259]

Wed, 04 January 1995 16:02

thompson
Messages: 584
Registered: August 1991

Senior Member

hartl@clouzot.imo.physik.uni-muenchen.de (Ingmar Hartl) writes:

> In article <hahn.74.00145964@hrz.th-darmstadt.de> hahn@hrz.th-darmstadt.de (Norbert Hahn) writes:
>> and it looks as if begin is immediately followed by end:
>> IDL> repeat begin
>> All rights reserved. Unauthorized reproduction prohibited.
>> & END
>> ^
>> % Syntax error.

> Same happened to me.

> It worked, after I wrote a procedure with this statements.

> I think, it is only allowed to use BEGIN and END statements
> in procedures and functions. I found nothing to this point
> in the User's Guide...

> Ingmar Hartl.

Actually, on can use BEGIN and END statements from the command line, but one
has to fit in the entire command onto a single command line, e.g.

IDL> FOR I=1,10 DO BEGIN & PRINT,I & HELP,I & ENDFOR

(It actually doesn't matter if one uses END or ENDFOR. Always remembering to
use ENDFOR, ENDIF, ENDWHILE, etc. leads to more readable code and makes it
easier for IDL to point out where any errors might occur.)

If one only wants a single statement within a FOR loop, then one can omit the
BEGIN and ENDFOR statements, e.g.

IDL> FOR I=1,10 DO PRINT,I

If one can't fit the entire loop onto a single line, then one needs to write a
procedure, either by editing a file or by using .RUN, e.g.

IDL> .RUN
- FOR I=1,10 DO BEGIN
- PRINT, I
- HELP, I
- ENDFOR
- END

William Thompson

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[Message index]

		Re: Begin statement By: zawodny on Fri, 06 January 1995 04:29
		Re: Begin statement By: gurman on Thu, 05 January 1995 10:45
		Re: Begin statement By: thompson on Wed, 04 January 1995 16:02
		Re: Begin statement By: sigut on Wed, 04 January 1995 23:46
		Re: Begin statement By: zawodny on Wed, 04 January 1995 12:36
		Re: Begin statement By: afl on Wed, 04 January 1995 12:32
		Re: Begin statement By: hartl on Wed, 04 January 1995 13:41

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