hello, I have this graph shown below, I want to use it in my code for find (Y) value by giving (X) value, there is no equation can fit this curve, can you tell me the way for using this graph in my code please?

Answer 1

[Kuifeng]

 vq = interp1(x,v,xq,method) %help interp1

Answer 2

[Steven Lord]

Export the fit to the workspace then evaluate it. See the "Generate Code and Export Fits to the Workspace" and "Evaluate a Curve Fit" items in the Examples and How To section of this documentation page.