how to use curve fitting without using curve fitting toolbox?

I want to use curve fitting tool in the matlab script without opening the curve fitting toolbox.

I have a data (x,u) and i want to use fiiting in the matlab m.file. I used interplant with linear method as indicated in the following image.

how can i write the code in the M file to do the same done using cftool?

[Matt J]

I want to use curve fitting tool in the matlab script without opening the curve fitting toolbox.

Note that there is a difference between opening cftool and "opening the curve fitting toolbox". cftool is just a particular app within the toolbox.

Answer 1

[KSSV]

Refer this: https://in.mathworks.com/help/curvefit/curve-fitting.html

[zein]

how can i write the fitting function and specify interpolant and method linear?