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Re: A strange behaviour of parameters passing [message #15726 is a reply to message #15630]

Thu, 03 June 1999 00:00

Liam Gumley
Messages: 473
Registered: November 1994

Senior Member

Daniel SAGE wrote:
> Who can explain me the strange behaviour when I passed my parameters ?
> I create a small and stupid example to see the disfunctionning of IDL.
> Why the first call of the procedure 'one' returns 1 and the second call
> return 2 ? According the documentation of IDL, the second calling is
> correct but not the first calling.
[code removed]

I believe IDL is doing what it is supposed to do.

In the first call (one, a[*]), you are passing a subscripted array (even
though you requested all elements). Subscripted arrays are passed by
value and *cannot* be modified in the called procedure.

In the second call (one, a), you are passing an entire array. Entire
arrays are passed by reference and *can* be modified in the called
procedure.

Cheers,
Liam.

--
Liam E. Gumley
Space Science and Engineering Center, UW-Madison
http://cimss.ssec.wisc.edu/~gumley

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[Message index]

		A strange behaviour of parameters passing By: Daniel SAGE on Thu, 03 June 1999 00:00
		Re: A strange behaviour of parameters passing By: David Kastrup on Mon, 07 June 1999 00:00
		Re: A strange behaviour of parameters passing By: davidf on Mon, 07 June 1999 00:00
		Re: A strange behaviour of parameters passing By: rmlongfield on Mon, 07 June 1999 00:00
		Re: A strange behaviour of parameters passing By: davidf on Fri, 04 June 1999 00:00
		Re: A strange behaviour of parameters passing By: Vapuser on Fri, 04 June 1999 00:00
		Re: A strange behaviour of parameters passing By: steinhh on Fri, 04 June 1999 00:00
		Re: A strange behaviour of parameters passing By: Liam Gumley on Thu, 03 June 1999 00:00

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