Hi, I am not really sure this is the right topic to post my question in, but it is homework so... To my data in txt file I fitted a function ##f(x)## where ##x\in [0,100]##. In the original file I had only 100 points, but now that I have a nice polynomial fit, I can get infinite number of points (on that function). And that is exactly what I want to do. For example: Code (Text): f[0.5] returns me coordinates. (The argument in the code is parametrization of the fitted function from 0 to 1) Now my question is: From 100 original points, I need 800. And I have those 800 parameter values exactly defined in another txt file, lets call it values.txt. So the question is: How do I tell Mathematica to evaluate the fitted function at all the parametrization values in values.txt file? :/ Hopefully you understand what I need. I know it is simple, but I can't find it anywhere.