passing variable value into fittype function

Hello,

I am having some trouble passing variables into the fittype function.

I would like to pass the coefficient value from a Hermite Polynomial (Hp(n)) into a fit:

Hp=HermitePoly(1);    
fit11=fittype(@(a,b,c,x) a*b^2/c^2*(Hp(1)*sqrt(2)*x/c)*exp(-x^2/c^2));

This doesn't work, neither, for some reason, does the example given on the website:

     c = 1;
     g = fittype( @(a, b, x) a*x.^2+b*x+c )

I tried to run those two lines of code and I am told "First input argument must be a string or cell array"

Am I missing something really obvious here?

Any help would be greatly appreciated.

Thanks, David

[Andrew Newell]

Which version of MATLAB are you using?