Re: How to NSolve equation which involves NIntegrate?

*To*: mathgroup at smc.vnet.net*Subject*: [mg120081] Re: How to NSolve equation which involves NIntegrate?*From*: Ted Sariyski <tsariysk at craft-tech.com>*Date*: Fri, 8 Jul 2011 04:50:18 -0400 (EDT)*References*: <201106250929.FAA20235@smc.vnet.net> <201106271131.HAA07842@smc.vnet.net> <201106281155.HAA21486@smc.vnet.net> <002f01cc35a6$3dd69ca0$b983d5e0$@dahl@telia.com> <201106290929.FAA02776@smc.vnet.net> <2A0AA73D3621CE4BBE6BAEC6FEB4661E01E0BD0A@MBX01.seas.harvard.edu> <201107071131.HAA15319@smc.vnet.net> <op.vx86doa8tgfoz2@bobbys-imac.local>

I am sorry, I should made up an example. Here it is: f[a_] := NIntegrate[Sin[a x], {x, 0, 1}] g[a_] := a*a NSolve[f[a] == g[a], a] Out[]: NIntegrate::inumr: "The integrand Sin[a x] has evaluated to non-numerical values for all sampling points in the region with boundaries {{0,1}}." Thanks, --Ted On 7/7/2011 10:26 AM, DrMajorBob wrote: > You left out the definition of h, so how can we possibly tell you why > it evaluates to non-numerical values? > > Bobby > > On Thu, 07 Jul 2011 06:31:38 -0500, Ted Sariyski > <tsariysk at craft-tech.com> wrote: > >> Hi, >> I need a numerical solution for a system of equations which involve >> numerical integrals. For one parameter the equation would be: >> >> f[a]==g[a] >> where >> f[a_]:=NIntegrate[h[x, a] , {x, x1, x2}] >> >> NSolve returns: "The integrand has evaluated to non-numerical values". >> >> Is there a built-in procedures for this type of problems or I need to >> make explicit iterations? >> >> Thanks in advance, >> --Ted >> >> >> >> >> > >

**References**:**How to NSolve equation which involves NIntegrate?***From:*Ted Sariyski <tsariysk@craft-tech.com>