Re: NonLinearRegress Problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg68377] Re: [mg68346] NonLinearRegress Problem*From*: Darren Glosemeyer <darreng at wolfram.com>*Date*: Thu, 3 Aug 2006 06:06:41 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

This happens because deb gets evaluated before teta, n, and t are numeric. To keep deb from evaluating before all necessary quantities are numeric, you can add NumericQ checks to each of the arguments as follows. deb[teta_?NumericQ,n_?NumericQ,t_?NumericQ]:= 9 n (t/teta)^3 Nintegrate[(x^4 Exp[x])/(1+Exp[x])^2,{x,0,t/teta}] If deb has already been defined using the other definition in your session, you will want to Clear[deb] first. Otherwise the definition without ?NumericQ checks will still be seen and result in the same problem as before. Darren Glosemeyer Wolfram Research At 05:23 AM 8/2/2006 -0400, jour wrote: >I have the following problem with NonLinearRegress > >I have defined the following function > >deb[teta_,n_,t]:= 9 n (t/teta)^3 Nintegrate[(x^4 >Exp[x])/(1+Exp[x])^2,{x,0,t/teta}] > >I can Table this function without problem > >Table[{t, deb2[100, 3, t]}, {t, 1, 200, 5}] > >but when I try to use this function in NonlinearRegress > >fut = NonlinearRegress[dat, >deb2[teta, n, t], >{t}, {{teta, {10., 50.}, 0., 1000.}, {n, {1, 3}, 1, 70}}] > >I get an error message > >NIntegrate::"nlim" t/teta is not a valid limit of integration > >any suggestions ?