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Re: while loop crashes [message #71150 is a reply to message #71147]

Tue, 01 June 2010 03:27

lila hadji
Messages: 7
Registered: June 2010

Junior Member

On 1 juin, 12:18, Spon <christoph.b...@gmail.com> wrote:
> On Jun 1, 8:51 am, hovru <h.rube...@gmail.com> wrote:
>
>> Wouldn't you not need the "Pro" and "End" if it's not a program, just
>> a script (such as when you use "Journal")?
>> Also, leaving out the "return" should be fine, since there is only one
>> level, right?
>
>> Thanks.
>
> Looks like you can't have loops or statements in batch files; every
> statement has to be complete, just like if you were using the command
> line.
>
> So, this works fine, but your program does not:
> ---
> print, 'start while loop'
> j=2
> while (j NE 10) do j=j+1
>
> print, 'done', j
> ---
>
> Have a look at the helpfile for 'Executing Batch Jobs in IDL', I
> guess.
> I've always wondered why people even use batch mode, when procedures
> and functions are almost as easy to write. What is the advantage of
> batch mode?
>
> No, you don't need the 'return', but what harm is it doing? Plus, if
> you decide to modify the code to pass variables or keywords to it
> later, you might wonder why they never come back. :-)
>
> Chris
Actually, when you want to run a script, you can remose the pro line,
and add (optionally) $Main$ at the beginning (to speed up the
performances)
You can also remove the return line but you have absolutely to keep
the end line.
; files simpletest.pro
$Main$
print, 'start while loop'
j=2
while (j NE 10) do begin
print,j
j=j+1
print, j
endwhile

print, 'done'
end

and all you have to do in IDL screen is tape .run simpletest.pro
Hope it helps a little
Cheers
Lila

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[Message index]

		Re: while loop crashes By: Juggernaut on Wed, 02 June 2010 05:54
		Re: while loop crashes By: hovru on Wed, 02 June 2010 01:48
		Re: while loop crashes By: lila hadji on Tue, 01 June 2010 23:03
		Re: while loop crashes By: Michael Galloy on Tue, 01 June 2010 13:08
		Re: while loop crashes By: Michael Galloy on Tue, 01 June 2010 12:49
		Re: while loop crashes By: Michael Galloy on Tue, 01 June 2010 12:43
		Re: while loop crashes By: Juggernaut on Tue, 01 June 2010 06:47
		Re: while loop crashes By: lila hadji on Tue, 01 June 2010 03:27
		Re: while loop crashes By: Spon on Tue, 01 June 2010 03:18
		Re: while loop crashes By: hovru on Tue, 01 June 2010 00:51
		Re: while loop crashes By: Spon on Tue, 01 June 2010 00:38

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