Question on General::nlnum warning when use FindRoot

*To*: mathgroup at smc.vnet.net*Subject*: [mg55133] Question on General::nlnum warning when use FindRoot*From*: "PengYu.UT at gmail.com" <PengYu.UT at gmail.com>*Date*: Sun, 13 Mar 2005 04:57:56 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

Hi All, When I use FindRoot to solve an equation, I always get the warning General::nlnum. Do you have any idea what this warning refers to? The mathematical help says "Notes for this message have not yet been added." What function I should use to solve that equation numerically? Thanks! Best wishes, Peng intensity[x_, Î´_, p_, Î»_] := 1/4 + (2*Cos[(Pi*x)/100])/Pi + (4*Cos[(Pi*x)/100]^2)/Pi^2 - (2*Cos[(3*Pi*x)/100])/(3*Pi) - (8*Cos[(Pi*x)/100]*Cos[(3*Pi*x)/100])/(3*Pi^2) + (4*Cos[(3*Pi*x)/100]^2)/(9*Pi^2) FindRoot[intensity[50, Î´, 200, 50] == 0.3*(1/4 + 32/(9*Pi^2) + (4*Sqrt[2])/(3*Pi))*1.1, {Î´, 1}]