Bug in example in documentation at page "Nonlinear Least-Squares Fitting"

[Brian Gough]

Erik-Jan Vlieger writes:
 > I tried to compile the example from "Nonlinear Least-Squares
 > Fitting", but it gave compilation errors. I created a different
 > version that does compile, but I'm not sure I did it right. The
 > calculated results are correct though.  The source in included
 > below.

Thanks.  I've corrected the example now.