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Re: Problem with parallel evaluation of integrals depending

  • To: mathgroup at smc.vnet.net
  • Subject: [mg99910] Re: [mg99869] Problem with parallel evaluation of integrals depending
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Tue, 19 May 2009 06:44:11 -0400 (EDT)
  • References: <200905180629.CAA10384@smc.vnet.net>
  • Reply-to: drmajorbob at bigfoot.com

That couldn't work in ANY kernel, since the first line should be

G[s_]:=Integrate[F[x],{x,0,s}]

The upper limit can't be S, which is undefined.

Bobby

On Mon, 18 May 2009 01:29:12 -0500, Alan Barhorst <alan.barhorst at ttu.edu>  
wrote:

> Hello, I am hoping someone can help me.  I am trying to pass something
> like:
>
> G[s_]:=Integrate[F[x],{x,0,S}]
> NIntegrate[G[s],{s,0,1}]
>
> to parallel kernels.  The operation is successful in the base kernel
> but fails in the other kernels due to the interior integral not being
> evaluated.  The error is as follows.
>
> NIntegrate::"inumr" :  "The integrand (   SubsuperscriptBox[ =E2=88=A7 ,  
> 0 ,
> \
>   S ] Sin[ SubscriptBox[ =CF=86$10572 ,  11 ]\   SubscriptBox[  
> =CF=88$10572 ,
> 11 ] [x]] \
> =C2=AE=EF=A1=BFx  )    SubscriptBox[\"F$10572\", \"1\"] [S] has  
> evaluated to non-
> numerical \
> values for all sampling points in the region with boundaries {{0, 1}}."
>
> For some reason the upper bound of the interior integral is not
> replaced with the grid points on {0,1} in the parallel evaluation.  I
> have Distributed the global variable definitions to the kernels after
> the function G[s] have been defined.
>
> I have tried several things to break this loose but have been
> unsuccessful.  Any pointers are appreciated.
>
>
> AB
> ________________________________________________________
> Alan A. Barhorst, PhD, PE	        | alan.barhorst at ttu.edu
> Professor					| http://www.me.ttu.edu/
> Mechanical Engineering		| Phone: 806-742-3563, ext 241
> Texas Tech University
> Lubbock, TX 79409-1021	
>
> When leaders disregard the law and human dignity, kooks
> are emboldened; innocence lost.
>
> Human potential cannot be developed or measured from a
> floating moral reference frame.
> ________________________________________________________
>
>
>
>



-- 
DrMajorBob at bigfoot.com


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