unmkpp

Extract piecewise polynomial details

提取分段多项式细节

Syntax

[breaks,coefs,L,order,dim] = unmkpp(pp)

Unwrap Piecewise Polynomial Information

Create a piecewise polynomial structure for the polynomial  on the interval [0 3], and then extract the information from the fields of the structure.
pp = mkpp([0 3],[1 1 1])

[breaks,coefs,L,order,dim] = unmkpp(pp)

Input Arguments

pp — Piecewise polynomial
structure

Piecewise polynomial, specified as a structure. You can create pp using spline, pchip, interp1, or the spline utility function mkpp.

Output Arguments

breaks — Break points
vector

Break points, returned as a vector of length L+1 with strictly increasing elements that represent the start and end of each of L intervals.

coefs — Polynomial coefficients
matrix

Polynomial coefficients, returned as an L-by-k matrix with each row coefs(i,:) containing the local coefficients of an order k polynomial on the ith interval, [breaks(i),breaks(i+1)].

L — Number of intervals
scalar

Number of intervals, returned as a scalar.

order — Order of polynomials
scalar

Order of polynomials, returned as a scalar.

dim — Dimension of target
scalar | vector

Dimension of target, returned as a scalar or vector.

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