FindRoot migration question

*To*: mathgroup at smc.vnet.net*Subject*: [mg79904] FindRoot migration question*From*: "Guillermo Barrenetxea" <ilargia at gmail.com>*Date*: Wed, 8 Aug 2007 04:55:43 -0400 (EDT)

Hi, I have recently migrated form mathematica 4 to mathematica 6, and some of the programs I was using are not correct any more. One recurrent error occurs with functions including FindRoot. I enclose here an example: thanks for your help, guillermo quit; cmin = 10^(-10); cmax = 1/100; sigma1[n1_, nx_, cov_, L_] := (4 Pi^2 L^2 nx (1 - n1))/(Log[1/cov] - ((3 - cov) (1 - cov)/2)) LL1[nx_, cov_] := FindRoot[nx L^2 Pi (Log[L^2 Pi] - (1 - (1/(Pi L^2)))) == Log[1/cov] - (1 - cov), {L, 1.0, 2.0}] sigm1[n1_, nx_, cov_] := sigma1[n1, nx, cov, L /. LL1[nx, cov]] sigm1[1/10000000000, 1/10000000000, 1/10000000000] (* this works perfectly *) (* however, if I want to interpolate the sim1 function, it complains *) sig1 = FunctionInterpolation[sigm1[n1, nx, cov], {n1, cmin, cmax}, {nx, cmin, cmax}, {cov, cmin,cmax}];