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Re: Looping over parameters without EXECUTE() [message #43937 is a reply to message #43804]

Tue, 03 May 2005 10:41

JD Smith
Messages: 850
Registered: December 1999

Senior Member

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

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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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