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MathGroup Archive 2007

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Re: Intensive numerical calculations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80392] Re: Intensive numerical calculations
  • From: Yaroslav Bulatov <yaroslavvb at gmail.com>
  • Date: Tue, 21 Aug 2007 05:01:37 -0400 (EDT)
  • References: <f9s445$all$1@smc.vnet.net><fabgog$id8$1@smc.vnet.net>

Efficiency can vary depending on your implementation. For instance
here's a range of solutions to the problem of sampling markov chains,
and their execution times varies by a factor of more than 2000. The
fastest solution had similar runtime to optimized C code.

http://groups.google.com/group/comp.soft-sys.math.mathematica/browse_thread/thread/21f088453d0c6745/5e9853ea4489135d?lnk=st&q=&rnum=1#5e9853ea4489135d

On Aug 20, 12:44 am, Cristian <LumisrobToglique... at yahoo.com> wrote:
> On Tue, 14 Aug 2007 11:36:37 +0000 (UTC), Bill Rowe
>
> <readnews... at sbcglobal.net> wrote:
> >On 8/13/07 at 4:33 AM, LumisrobToglique... at yahoo.com (Cristian)
> >wrote:
>
> >>How much is it distant Mathematica from the speed of the c++
> >>language compiled ?
>
> >A well written program in a compiled language like C++ will
> >always execute much faster than a similar program written in
> >Mathematica code. But I strongly believe this type of comparison
> >isn't useful.
>
> I also thought so but if I have to make intensive calculations I have
> to turn to c++, matlink etc.............then boh....
>
> >The execution speed advantage of C++ is more than
> >offset by the development time for the program.
>
> true on light calculations
> not true for greater projects
>
> >=46or any non-trivial program written in Mathematica code, you
> >will be making use of Mathematica function that would have to be
> >re-written in C++ code.And even if this is not the case, things
> >that take several lines of C++ code tend to take much fewer
> >lines of code in Mathematica.
>
> But if these objects I cannot use them to perhaps make intensive
> calculations it was better that I immediately wrote them in c++ ..imho
>
> >This is an inherent advantage of
> >using a higher level functions available in Mathematica and not
> >available in C++.
>
> scientific interpreters exist  also for the c++ with numerical libraries....
> then at the end.... boh
>
> cristian




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