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MathGroup Archive 2007

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Re: Intensive numerical calculations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80517] Re: Intensive numerical calculations
  • From: Cristian <LumisrobTogliquesto at yahoo.com>
  • Date: Fri, 24 Aug 2007 01:57:18 -0400 (EDT)
  • References: <f9s445$all$1@smc.vnet.net><fabgog$id8$1@smc.vnet.net> <fae9u4$ec7$1@smc.vnet.net> <200708220838.EAA08507@smc.vnet.net> <faj4vu$8sk$1@smc.vnet.net>

On Thu, 23 Aug 2007 05:12:30 +0000 (UTC), Daniel Lichtblau
<danl at wolfram.com> wrote:

>Cristian wrote:
]zac[
>
>Suffice it to say that a dense representation will cause problems for 
>most software on many machines. As for a sparse represntation, and 
>computational speed, it will depend on what specifically you want to do. 
>Mathematica uses some fairly good libraries for certain linear algebra 
>operations on such matrices. If what you require is not well supported 
>then you might need to go to some other approach, perhaps via MathLink.
>
>Daniel Lichtblau
>Wolfram Research
>
My problem is not the dimension of the matrixes. Certainly the
limitation on the packeds array (< 2^31)limits, but my true problem is
the slowness in to pass these matrixes to the form c++ by matlink.
That that profit inserting pieces in c++, I lose in the transfers
through matlink. I have to develop a form (structural fem)
personalized for the analysis of parts mechanics submitted to dynamic
solicitations and I was considering mathematica because I knew it from
the university. If I use c++ and MTL  for example it'is ok There is a
method for move more quickly big matrixes (unfortunately the matrixes
become full with the progress of the footsteps and it would be for me
too complicated to avoid this to the beginning)  from Mathematica to
an external form in c++?


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