I hope my email finds everyone in good health. Can anyone please help me how to actually find the interpolation function when I use the command "interp". I have attached a file that interpolates frequency based on phase angles and I have plotted the graph. But I would like to what is the equation that I have used here using "interp" and "cspline".
If you need an analytic expression for one function you would better not use an interpolation but rather a regression, a curve fit.There are numerous ways to do so in Mathcad and you would have to decide at first which type of function to use for the fit.