For each subinterval, perform M-order Lagrangian interpolation on f(x) at sequence position k, then f(x) can be approximately equal to the corresponding Lagrange interpolation polynomial p, namely:
For each subinterval, the Lagrangian interpolation of the M-order on the sequence position k, respectively, on f(x), f(x) can approximately equal to the corresponding Lagrangian interpolation polynomial p, i.e.:
For each subinterval, f (x) is interpolated with m order Lagrange interpolation on the sequence position K respectively, then f (x) can be approximately equal to the corresponding Lagrange interpolation polynomial P, that is:<br>