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

**References**:**Problem with parallel evaluation of integrals depending on a parameter***From:*Alan Barhorst <alan.barhorst@ttu.edu>