Question: Too long evaluation

December 03 2012 Combs 0
Maple 16
0

Hi, I'm working on fitting model. For some reason is taking way too long to evaluate it actually hasn't finished it at all. Im running on i7. Thanks for any help. this is my code: 

> X := Vector([0, 170, 0]);
              
> Y := Vector([0, 11, 56]);
               

Q(t) := -(36788*76)*(.28*K*p/(-p-exp(-r*t)*K+exp(-r*t)*p)+.28*t*p*K*(r*exp(-r*t)*K-r*exp(-r*t)*p)/(-p-exp(-r*t)*K+exp(-r*t)*p)^2)*exp(.28*t*p*K/(-p-exp(-r*t)*K+exp(-r*t)*p))-(80457*76)*(.28*K*p/(-p-exp(-r*(t-1))*K+exp(-r*t)*p)+.28*t*p*K*(r*exp(-r*(t-1))*K-r*exp(-r*(t-1))*p)/(-p-exp(-r*(t-1))*K+exp(-r*(t-1))*p)^2)*exp((.28*(t-1))*p*K/(-p-exp(-r*(t-1))*K+exp(-r*(t-1))*p))-(92096*76)*(.28*K*p/(-p-exp(-r*(t-2))*K+exp(-r*t)*p)+.28*t*p*K*(r*exp(-r*(t-2))*K-r*exp(-r*(t-2))*p)/(-p-exp(-r*(t-2))*K+exp(-r*(t-2))*p)^2)*exp((.28*(t-2))*p*K/(-p-exp(-r*(t-2))*K+exp(-r*(t-2))*p))-(78400*76)*(.28*K*p/(-p-exp(-r*(t-3))*K+exp(-r*t)*p)+.28*t*p*K*(r*exp(-r*(t-3))*K-r*exp(-r*(t-3))*p)/(-p-exp(-r*(t-3))*K+exp(-r*(t-3))*p)^2)*exp((.28*(t-3))*p*K/(-p-exp(-r*(t-3))*K+exp(-r*(t-3))*p))-(70040*76)*(.28*K*p/(-p-exp(-r*(t-4))*K+exp(-r*t)*p)+.28*t*p*K*(r*exp(-r*(t-4))*K-r*exp(-r*(t-4))*p)/(-p-exp(-r*(t-4))*K+exp(-r*(t-4))*p)^2)*exp((.28*(t-4))*p*K/(-p-exp(-r*(t-4))*K+exp(-r*(t-4))*p))-(65093*76)*(.28*K*p/(-p-exp(-r*(t-5))*K+exp(-r*t)*p)+.28*t*p*K*(r*exp(-r*(t-5))*K-r*exp(-r*(t-5))*p)/(-p-exp(-r*(t-5))*K+exp(-r*(t-5))*p)^2)*exp((.28*(t-5))*p*K/(-p-exp(-r*(t-5))*K+exp(-r*(t-5))*p);


> NonlinearFit(Q(t), Y, X, t);

 

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