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Help !!!!


Dear Mathgroup,

I do some optimization practice using FindMinimum command. The Objective 
function is :

 -k + 0.004*t*(93633.3333333333 + 529.9999999999999*t + t^2) + 
   (0.005000000000000001*(1.566333333333333*10^7*k - 93633.3333333333*k*t - 
        529.9999999999999*k*t^2 - 1.*k*t^3))/(0.75 + 1.*k)

But I could not get the solution for it. t and k are variables.
the message I got is :

FindMinimum::fmlim: The minimum could not be bracketed in 30 iterations.


The arguement is:  FindMinimum[test3[t,k],{t,50,80},{k,2,5}]

I hope someone can help me out. Very appreciate.

Chengri Ding
Univeristy of Illinois at Urbana-Champaign


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