Interpolation error

[zhang (zhangQK)]

Thank you,Mark.
In fact,the piecewise function is obtained by many data such as (xi,yi),and I just want to fit these data to a function.
In addition,I found a better way that is from

Fitting piecewise linear function

Hi, I have some data which needs to fit the convex piecewise linear function max_i(a*v_i+b*s_i) I want to determine the values of a and b from the fit. Is there a function in cvx that can do the fitting or do I have to write the iterative algorithm myself? Also, are there examples for convex piecewise linear fitting in the software package that I could look at? Thanks Aparna

So I have solved this question.
Thank you very much.