I have copied Hal Varian's Add-on into the autoload directory
in Mathematica. I am interested in using the package SymbOpt.m
which is available on the Diskette. I am able to utilize the
Grad function, however, I am unable to use the Hessian function
or the FOC function properly. Does anyone know why I might be
able to access some but not all of the proceedures defined in
the SymbOpt.m package?