How do you find a sinusoidal curve on given data without using curve fit tool box?

I have a bunch of data points that outputs a graph similar to a sinusoidal, but I want to use matlab to create a single sinusoidal curve with the data given. Help, please?

Answer 1

[dpb]

Then you have to do it yourself with the nonlinear optimization routines...the example is at Curve-fitting via Optimization

Answer 2

[Star Strider]

See Curve fitting to a sinusoidal function (link).