title: n-dimensional non-linear curve fitting in Matlab
body: <p>Is there any way to fit a function with n variables in Matlab? Any example would be very useful.
  Till now I used curve fitting toolbox, which provides solution I need for functions with 2 arguments. But now I need to fit a function with much more variables.
  The worst thing is that dependance is non-linear (probably something like a/x+b/y+c/z+…, but it's only a hypothesis). If it was linear, '\' operator would do the trick.</p>