| Re: Passing more than one variable out of a function. [message #65828] |
Thu, 26 March 2009 06:12 |
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Mike[2]
Messages: 99
Registered: December 2005
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Member |
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On Mar 25, 4:14 am, philipel...@googlemail.com wrote:
> The important thing to notice is that RETURN can accept an
> array as a parameter.
RETURNing anonymous structures is a handy way to pass back results
with mixed types. As in:
function do_this, x
result = {timestamp: systime(), $
mean: mean(x), $
min: min(x), $
value:some_other_calculation_using_x(x) $
}
return(result)
end
foo = do_this(x)
print, foo.timestamp
print, foo.mean
print, foo.min
print, foo.value
Regards, Mike
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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
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Junior Member |
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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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| Re: Passing more than one variable out of a function. [message #65847 is a reply to message #65846] |
Wed, 25 March 2009 00:56 |
Maarten[1]
Messages: 176
Registered: November 2005
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Senior Member |
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On Mar 25, 5:31 am, Ben <Benjamin.R.Ev...@gmail.com> wrote:
> 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.
Just like a procedure actually.
function blah, in, out
out = 2*in
return, sqrt(in)
end
r = blah(4, out)
print, r, out
; prints: 2 8
Maarten
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