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Re: Looping over parameters without EXECUTE() [message #43935 is a reply to message #43804]

Tue, 03 May 2005 11:00

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

JD Smith wrote:
> On Tue, 03 May 2005 15:43:33 +0200, Thomas Pfaff wrote:
>
>
>>
>> JD Smith schrieb:
>>
>>> On Mon, 02 May 2005 12:10:43 -0400, Wayne Landsman wrote:
>>>
>>>
>>>
>>>> The one case where I haven't figured out how to remove EXECUTE() from a
>>>> program (to allow use with the Virtual Machine) is where one wants to
>>>> loop over supplied parameters. For example, to apply the procedure
>>>> 'myproc' to each supplied parameter (which may have different data
>>>> types) one can use EXECUTE() to write each parameter to a temporary
>>>> variable:
>
>
>> How about putting all those parameters into a (named or anonymous)
>> struct? Then you can have different types for each parameter and you're
>> still able to loop over the elements.
>>
>> pro doit, param_struct
>> for i=0, n_tags(param_struct) -1 do begin
>> arg = param_struct.(i) ;->this way you can even store result values
>> myproc, arg
>> param_struct.(i) = arg
>> endfor
>> end
>>
>> Would that be a possibility, or am I missing something?
>
>
> That works OK, and if you used TEMPORARY() you could cut down the data
> copying penalty. There are two main problems with this approach: 1) the
> user has to create a potentially large struct as input and then unpack it
> as output, which is not convenient from the command line, especially for
> output arguments, and 2) the type and size of each argument cannot be
> changed, thanks to the nature of structs.
>
> JD

You could change the type and size of each argument of a struct with
some of our library tools. e.g. replace_tagvalue. But your are right
this is done with a trick by duplicating the structure in a new one.
But in this case it is overkill.

Reimar

--
Reimar Bauer

Institut fuer Stratosphaerische Chemie (ICG-I)
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
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[Message index]

		Looping over parameters without EXECUTE() By: Wayne Landsman on Mon, 02 May 2005 09:10
		Re: Looping over parameters without EXECUTE() By: Ken Mankoff on Tue, 03 May 2005 16:31
		Re: Looping over parameters without EXECUTE() By: R.Bauer on Tue, 03 May 2005 11:00
		Re: Looping over parameters without EXECUTE() By: R.Bauer on Tue, 03 May 2005 10:47
		Re: Looping over parameters without EXECUTE() By: JD Smith on Tue, 03 May 2005 10:41
		Re: Looping over parameters without EXECUTE() By: Thomas Pfaff on Tue, 03 May 2005 06:43
		Re: Looping over parameters without EXECUTE() By: JD Smith on Mon, 02 May 2005 18:57

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