Curve Fitting (No noise)

I need to find the function that describes a dataset (x, y), the values do not have noise. Which commands do you recommend?

[Andrew Newell]

Depends what you mean by "describes"! If you want a curve that goes through all the points, interpolation would be best. If x and y are vectors, you could use interp1.

Answer 1

[Image Analyst]

See my polyfit() demo, attached. It's one of many possible ways. Whether or not it will be best for your needs is known only by you, not us.