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Re: Passing more than one variable out of a function. [message #65846 is a reply to message #65828]

Wed, 25 March 2009 01:14

philipelson
Messages: 9
Registered: March 2009

Junior Member

On 25 Mar, 04:31, Ben <Benjamin.R.Ev...@gmail.com> wrote:
> The IDL intrinsic function WHERE can pass more than one variable out
> to the calling program.
>
> For example:
>
>> array=[0,2,4,6,8,10]
>> arr_subscripts = WHERE(array GT 5, count)
>> print, arr_subscripts
>
> 3,4,5
>
>> print, count
>
> 3
>
> The question is how can I write a user defined function which can pass
> more than one variable out to the calling program. Just like the WHERE
> function?
>
> I know that I could just use a procedure to do this. But I am just
> curious.

Hi Ben,

WHERE is simply passing an array back to you, you can do the same with
the example code below:

FUNCTION test, count=count
IF ARG_PRESENT(count) THEN count=3
RETURN, [3,4,5]
END

print, test(count=mycountvar)
print, mycountvar

The important thing to notice is that RETURN can accept an array as a
parameter.

Hope this helps.

Cheers,

Philip

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[Message index]

		Re: Passing more than one variable out of a function. By: Mike[2] on Thu, 26 March 2009 06:12
		Re: Passing more than one variable out of a function. By: philipelson on Wed, 25 March 2009 01:14
		Re: Passing more than one variable out of a function. By: Maarten[1] on Wed, 25 March 2009 00:56

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