NonLinearRegress Problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg68346] NonLinearRegress Problem*From*: "jour" <jour at ccr.jussieu.fr>*Date*: Wed, 2 Aug 2006 05:23:59 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

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 ?