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Re: Calling functions with huge arguments

  • To: mathgroup at smc.vnet.net
  • Subject: [mg97666] Re: [mg97621] Calling functions with huge arguments
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Wed, 18 Mar 2009 04:54:26 -0500 (EST)
  • References: <200903170959.EAA17074@smc.vnet.net>
  • Reply-to: drmajorbob at bigfoot.com

HoldFirst and HoldAll.

Bobby

On Tue, 17 Mar 2009 04:59:17 -0500, Fernando Cucchietti  
<fernando.cucchietti at icfo.es> wrote:

> Hi all,
>
> I am working with a VERY large tensor, so much that I would like to
> keep at most two copies of it in memory at any given time. The
> algorithm I want to run is convoluted and repetitive, but it looks
> very compact when written in terms of subroutines and functions that
> call themselves many times. However, from what I gather, Mathematica
> effectively creates a copy of the arguments when a function is called.
> Is this correct?
> If so, I need to find a way to mimic pass-by-reference style as in C
> or Fortran, or just pass the arguments that are not big and keep my
> tensors defined globally (which I think makes the code look less
> nice). Unwrapping the code so that it does not call functions is not
> an option, because it would be very complex and never-again-usable.
> My main question is then: what are the best ways to do pass-by-
> reference (if it is better than global naming), or what approaches
> have you taken to overcome similar problems?
>
> Thanks in advance,
>
> Fernando
>



-- 
DrMajorBob at bigfoot.com


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