On Wed, May 4, 2011 at 2:18 PM, Matt Peddie mpeddie@gmail.com wrote:

Liam,

On Wed, May 04, 2011 at 10:20:42AM -0400, Liam Healy wrote:

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Unless I'm misunderstanding this request, this is already possible, in fact I'd regard it as the basic usage. Perhaps you are thrown off by the with-ode-integration macro and example.

Great! I followed the example to begin with, so that was my starting point.

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I made up this macro in order to easily accommodate the case of non-array usage in the ODE solvers, because I wanted to show a simple example with scalars. However if you look at how that macro expands, there is a symbol #:DEP that is bound to a foreign array with the appropriate dimensions:

[ macro definition ]

So what you want to do is mimic this form, but instead define your foreign array directly. Is this what you're asking about? If it's an issue of CL array vs. foreign array, then you can use #'cl-array or just copy it over at the beginning and end.

Thanks. I saw the way that DEP works within the macro, and I rewrote it a few times in an attempt to pass around the array directly and use grid:gref inside my dynamics function. I guess I just need to try a few more things (like I said, newbie here). I want to use the foreign array and avoid copying.

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P.S. Please join the mailing list to post. Thank you.

I joined right after I got the `your message needs to be approved' mail; sorry.

Matt

Good. Having said all that, I think there is definitely room for a more meaningful and more general macro than with-ode-integration. Though I'd like GSLL to be easier to use than GSL, at least calling make-ode-stepper, make-y-control, make-ode-evolution, apply-evolution, etc. on your own isn't any worse than GSL. And the macro expansion is what I would use as a "tutorial"; I understand for a CL newcomer it's still a tough task.

Liam