FindRoot and Derivatives

*To*: mathgroup at smc.vnet.net*Subject*: [mg24444] FindRoot and Derivatives*From*: "Chimba Mkandawire" <bluntme at u.washington.edu>*Date*: Tue, 18 Jul 2000 00:58:45 -0400 (EDT)*Organization*: University of Washington*Sender*: owner-wri-mathgroup at wolfram.com

I'm running Mathematica 4.0 on a P3, 550Mhz Zeon, and I'm having problems. Can FindRoot handle equations with derivatives? I've got this funky equation with a first derivative, but I cannot get a solution. Here's my code. In[1]:= eq = g/(j*h)*y'[t]*Log[y[t]/h+1] + y[t]+a== g*v + a*Exp[b*v*t]/(y[t]/h+1)^(b/d) In[2]:= n=0;v=1.;a=544.644;b=.000001;h=.6465;j=3.14094;g=182.965 t=.1;n=0 In[3]:= FindRoot[n++;eq,{y,0.01,1}] and this is the error I get FindRoot::frnum: Function (-182.955 + 1.38688 (0.&) is not a length 1 list of numbers at y = 0.01'