I created these two procedures, I want to introduce within a mla.
 But I have the following two problems that I need you guys help me 
solve:

Someone has implemented Levenberg-Marquardt algorithm. That is implemented in the  Dr. DE Holmgren's procedure in

http://www.maplesoft.com/applications/view.aspx?SID=4159

www.maplesoft.com/applications/view.aspx

But it  returned the error: Error, (in ln) numeric exception: division by zero for the function a * x ^ b.

Gracias

HerClau

What's wrong? 
Should I use for this function NLPSolve?

restart;
with(Optimization);
print(`output redirected...`); # input placeholder
  [ImportMPS, Interactive, LPSolve, LSSolve, Maximize, Minimize, NLPSolve, 

    QPSolve]

Hola,
How to ensure that the coefficients are displayed in a more understandable?