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keyword question [message #25218]

Wed, 23 May 2001 09:07

Randall Skelton
Messages: 169
Registered: October 2000

Senior Member

Greetings all,

I am trying to have an array *optionally* returned using a keyword
and I don't know the dimension of the array prior to the call. Why is
it that the passed keyword needs to be defined in IDL prior to being used
as a keyword?

What am I doing wrong here?

Cheers,
Randall

Here is an example:
---
function test, a, b=b
a = 1.0
if (keyword_set(b)) then b = fltarr(10)
return, 1
end
--

***This works as I'd expect:
IDL> print, test(a) && help, a
1
A FLOAT = 1.00000

***This does not work as I expect:
IDL> print, test(a,b=duh) && help, a, duh
1
A FLOAT = 1.00000
DUH UNDEFINED = <Undefined>

***This works which makes me mad:
IDL> duh = 1
IDL> print, test(a,b=duh) && help, a, duh
1
A FLOAT = 1.00000
DUH FLOAT = Array(20)

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