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Re: Problem Compiling and Using Functions [message #46875 is a reply to message #46804]

Sat, 07 January 2006 15:04

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

David Fanning wrote:

> someone@someplace.com writes:
>
>> DOH!... Doh!... doh!... (echoing off into the distance) :)
>>
>> Thanks for your fast response. It works now.
>>
>> I'm new to IDL and I'm not used there being this difference between
>> functions and procedures.
>>
>> So, procedures don't return anything and functions *always* have to
>> return something and the calling function/procedure has handle them
>> correctly.
>
> Yes, this is correct. But if you are going to write your
> functions to return 0s, you have surmised correctly that
> you could just as well use a procedure. All arguments
> to procedures and function alike (including keyword
> arguments) can be passed by reference, so getting things
> into and out of procedure (as well as functions) is
> reasonably trivial.
>
> Just keep chanting to yourself "IDL is NOT C, IDL is NOT C."
>
> Cheers,
>
> David

Hmm I think there was a change you could write a function which does not
need a return inside. It's not that's I like this. I like a clear
definition as above.

IDL> $more test.pro
function test

end

IDL> a=test()
IDL> help,a
A INT = 0

cheers

Reimar

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[Message index]

		Re: Problem Compiling and Using Functions By: David Fanning on Wed, 04 January 2006 16:13
		Re: Problem Compiling and Using Functions By: someone[1] on Wed, 04 January 2006 15:51
		Re: Problem Compiling and Using Functions By: Paul Van Delst[1] on Wed, 04 January 2006 14:48
		Re: Problem Compiling and Using Functions By: David Fanning on Wed, 04 January 2006 14:09
		Re: Problem Compiling and Using Functions By: R.Bauer on Sat, 07 January 2006 15:04

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