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Re: alternative to execute [message #47200 is a reply to message #37191]

Tue, 31 January 2006 18:22

Ken Mankoff
Messages: 158
Registered: February 2000

Senior Member

On Tue, 31 Jan 2006, greg michael wrote:
> I'm trying to think up a good way to implement a user-defined
> function which would run in the IDL VM. The function might involve
> any of about 300 similar 2-d arrays, each of which is quite
> expensive to generate. So I thought to obtain the function as a
> string, scan it to see which arrays are needed, generate them, and
> then apply the function with 'execute'. But 'execute' is excluded
> from the VM.
>
> A typical function might look like:
>
> result = b123 / b100 - .9 * b050 / b035
>
> Without execute, I can only think to attempt to write some kind of
> arithmetic interpreter. Would anyone have a suggestion for a way
> to get IDL to do this more directly?
>

Dump the data to disk, generate a small PRO that reads in the data,
executes your user function (using execute), and then dumps the
result back to disk, spawn a new 2nd IDL session, not VM, that runs
the generated PRO. As long as it takes less than 7 minutes to run
everything should work. Read back in the results, and continue.

-k.

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[Message index]

		Alternative to EXECUTE? By: anne.martel on Tue, 02 December 2003 06:40
		Re: alternative to execute By: marc schellens[1] on Wed, 01 February 2006 00:09
		Re: alternative to execute By: Ken Mankoff on Tue, 31 January 2006 18:22
		Re: alternative to execute By: greg michael on Wed, 01 February 2006 03:04
		Re: alternative to execute By: Robert Barnett on Tue, 31 January 2006 14:02
		Re: alternative to execute By: greg michael on Wed, 01 February 2006 03:01

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