fitting a curve to data

Can anyone tell me what mistake I am making here? Can you please suggest any changes which make this code work? Thank you.

Answer 1

[Star Strider]

Objective functions for lsqcurvefit and nlinfit have to have the parameter argument as the first argument and the dependent variable as the second argument.

This should work:

fun = @(x,xdata) x(1).*sin((x(2).*xdata)+x(3)); %function handle for approx curve