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PCHIP -- root solve

version 1.0.0.0 (5.04 KB) by Matthew Kelly
Fit a PCHIP spline through a data set and then compute the roots of the spline

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Updated 04 Mar 2017

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% [tRoot, vRoot, ppx, ppv] = getPchipRoots(t,x)
%
% This function computes a PCHIP spline through the data set x(t) and then
% finds the roots of the spline.
%
% INPUTS:
% t = [1,n] = monotonically increasing vector of time stamps
% x = [1,n] = data at each time stamp = x(t)
%
% OUTPUTS:
% tRoot = [1,k] = monotonically increasing vector corresponding to the
% time at which each root occurs. Empty if no roots exist.
% vRoot = [1,k] = derivative of the interpolant at each of the roots.
% ppx = Matlab pp-form (PCHIP) spline that interpolates x(t)
% ppv = Matlab pp-form spline that is the derivative of x(t)
%
% NOTES:
% -- roots are computed numerically using Ridder's Method.
%

Cite As

Matthew Kelly (2019). PCHIP -- root solve (https://www.mathworks.com/matlabcentral/fileexchange/61883-pchip-root-solve), MATLAB Central File Exchange. Retrieved .

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MATLAB Release Compatibility
Created with R2015b
Compatible with any release
Platform Compatibility
Windows macOS Linux