itp: The Interpolate, Truncate, Project (ITP) Root-Finding Algorithm

Implements the Interpolate, Truncate, Project (ITP) root-finding algorithm developed by Oliveira and Takahashi (2021) <doi:10.1145/3423597>. The user provides the function, from the real numbers to the real numbers, and an interval with the property that the values of the function at its endpoints have different signs. If the function is continuous over this interval then the ITP method estimates the value at which the function is equal to zero. If the function is discontinuous then a point of discontinuity at which the function changes sign may be found. The function can be supplied using either an R function or an external pointer to a C++ function. Tuning parameters of the ITP algorithm can be set by the user. Default values are set based on arguments in Oliveira and Takahashi (2021).

Version:	1.2.2
Imports:	Rcpp (≥ 1.0.8)
LinkingTo:	Rcpp
Suggests:	knitr, rmarkdown, stats, testthat (≥ 3.0.0)
Published:	2026-01-10
DOI:	10.32614/CRAN.package.itp
Author:	Paul J. Northrop [aut, cre, cph]
Maintainer:	Paul J. Northrop <p.northrop at ucl.ac.uk>
BugReports:	https://github.com/paulnorthrop/itp/issues
License:	GPL-2 | GPL-3 [expanded from: GPL (≥ 2)]
URL:	https://paulnorthrop.github.io/itp/, https://github.com/paulnorthrop/itp
NeedsCompilation:	yes
Materials:	README, NEWS
In views:	NumericalMathematics
CRAN checks:	itp results

Documentation:

Reference manual:	itp.html , itp.pdf
Vignettes:	Overview of the itp package (source, R code)

Downloads:

Package source:	itp_1.2.2.tar.gz
Windows binaries:	r-devel: itp_1.2.2.zip, r-release: itp_1.2.2.zip, r-oldrel: itp_1.2.2.zip
macOS binaries:	r-release (arm64): itp_1.2.2.tgz, r-oldrel (arm64): itp_1.2.2.tgz, r-release (x86_64): itp_1.2.2.tgz, r-oldrel (x86_64): itp_1.2.2.tgz
Old sources:	itp archive

Reverse dependencies:

Reverse imports:

evmissing, profileCI

Linking:

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