{ "_id": "6a3b46d85cdecea1d6815e54", "Package": "itp", "Type": "Package", "Title": "The Interpolate, Truncate, Project (ITP) Root-Finding Algorithm", "Version": "1.2.2", "Date": "2026-01-09", "Authors@R": "person(c(\"Paul\", \"J.\"), \"Northrop\", email = \"p.northrop@ucl.ac.uk\",\nrole = c(\"aut\", \"cre\", \"cph\"))", "Description": "Implements the Interpolate, Truncate, Project (ITP)\nroot-finding algorithm developed by Oliveira and Takahashi\n(2021) . The user provides the function,\nfrom the real numbers to the real numbers, and an interval with\nthe property that the values of the function at its endpoints\nhave different signs. If the function is continuous over this\ninterval then the ITP method estimates the value at which the\nfunction is equal to zero. If the function is discontinuous\nthen a point of discontinuity at which the function changes\nsign may be found. The function can be supplied using either an\nR function or an external pointer to a C++ function. Tuning\nparameters of the ITP algorithm can be set by the user. Default\nvalues are set based on arguments in Oliveira and Takahashi\n(2021).", "License": "GPL (>= 2)", "Encoding": "UTF-8", "RoxygenNote": "7.3.3", "VignetteBuilder": "knitr", "URL": "https://paulnorthrop.github.io/itp/,\nhttps://github.com/paulnorthrop/itp", "BugReports": "https://github.com/paulnorthrop/itp/issues", "Config/testthat/edition": "3", "Repository": "https://paulnorthrop.r-universe.dev", "Date/Publication": "2026-01-24 19:47:29 UTC", "RemoteUrl": "https://github.com/paulnorthrop/itp", "RemoteRef": "HEAD", "RemoteSha": "06102d9cca48b1ad22ed94e46f567328fc0a5eac", "NeedsCompilation": "yes", "Packaged": { "Date": "2026-06-24 02:46:41 UTC", "User": "root" }, "Author": "Paul J. Northrop [aut, cre, cph]", "Maintainer": "Paul J. Northrop ", "MD5sum": "d268d152b86467418ff09103353e1706", "_user": "paulnorthrop", "_type": "src", "_file": "itp_1.2.2.tar.gz", "_fileid": "5d4c37830df306c81d60c922adf4b5e6097a7187bea00235e99c3e84cf7977bb", "_filesize": 503304, "_sha256": "5d4c37830df306c81d60c922adf4b5e6097a7187bea00235e99c3e84cf7977bb", "_created": "2026-06-24T02:46:41.000Z", "_published": "2026-06-24T02:54:16.303Z", "_distro": "resolute", "_jobs": [ { "job": 83107170602, "time": 129, "config": "linux-devel-arm64", "r": "4.7.0", "check": "OK", "artifact": "7838901150" }, { "job": 83107170596, "time": 129, "config": "linux-devel-x86_64", "r": "4.7.0", "check": "OK", "artifact": "7838900723" }, { "job": 83107170592, "time": 133, "config": "linux-release-arm64", "r": "4.6.0", "check": "OK", "artifact": "7838901807" }, { "job": 83107170603, "time": 127, "config": "linux-release-x86_64", "r": "4.6.0", "check": "OK", "artifact": "7838900276" }, { "job": 83107170612, "time": 109, "config": "macos-oldrel-arm64", "r": "4.5.3", "check": "OK", "artifact": "7838904505" }, { "job": 83107170609, "time": 192, "config": "macos-oldrel-x86_64", "r": "4.5.3", "check": "OK", "artifact": "7838920777" }, { "job": 83107170616, "time": 101, "config": "macos-release-arm64", "r": "4.6.0", "check": "OK", "artifact": "7838911938" }, { "job": 83107170631, "time": 284, "config": "macos-release-x86_64", "r": "4.6.0", "check": "OK", "artifact": "7838956400" }, { "job": 83106839050, "time": 187, "config": "source", "r": "4.6.0", "check": "OK", "artifact": "7838872453" }, { "job": 83107170575, "time": 140, "config": "wasm-release", "r": "4.6.0", "check": "OK", "artifact": "7838902864" }, { "job": 83107170593, "time": 145, "config": "windows-devel", "r": "4.7.0", "check": "OK", "artifact": "7838903981" }, { "job": 83107170610, "time": 114, "config": "windows-oldrel", "r": "4.5.3", "check": "OK", "artifact": "7838897458" }, { "job": 83107170583, "time": 98, "config": "windows-release", "r": "4.6.0", "check": "OK", "artifact": "7838894249" } ], "_buildurl": "https://github.com/r-universe/paulnorthrop/actions/runs/28071500618", "_status": "success", "_host": "GitHub-Actions", "_upstream": "https://github.com/paulnorthrop/itp", "_commit": { "id": "06102d9cca48b1ad22ed94e46f567328fc0a5eac", "author": "Paul Northrop ", "committer": "Paul Northrop ", "message": "rm warning\n", "time": 1769284049 }, "_maintainer": { "name": "Paul J. Northrop", "email": "p.northrop@ucl.ac.uk", "login": "paulnorthrop", "description": "", "uuid": 22778905 }, "_registered": true, "_dependencies": [ { "package": "Rcpp", "role": "LinkingTo" }, { "package": "Rcpp", "version": ">= 1.0.8", "role": "Imports" }, { "package": "knitr", "role": "Suggests" }, { "package": "rmarkdown", "role": "Suggests" }, { "package": "stats", "role": "Suggests" }, { "package": "testthat", "version": ">= 3.0.0", "role": "Suggests" } ], "_owner": "paulnorthrop", "_selfowned": true, "_usedby": 2, "_updates": [ { "week": "2025-28", "n": 1 }, { "week": "2026-01", "n": 5 }, { "week": "2026-02", "n": 7 }, { "week": "2026-03", "n": 1 }, { "week": "2026-04", "n": 1 } ], "_tags": [ { "name": "v.1.2.2", "date": "2026-01-09" } ], "_topics": [ "algorithm", "bracketing", "itp", "itp-method", "root-finding", "cpp" ], "_stars": 13, "_contributors": [ { "user": "paulnorthrop", "count": 208, "uuid": 22778905 } ], "_userbio": { "uuid": 22778905, "type": "user", "name": "Paul Northrop", "followers": 42 }, "_downloads": { "count": 355, "source": "https://cranlogs.r-pkg.org/downloads/total/last-month/itp" }, "_devurl": "https://github.com/paulnorthrop/itp", "_pkgdown": "https://paulnorthrop.github.io/itp/", "_searchresults": 10, "_rbuild": "4.6.0", "_assets": [ "extra/citation.cff", "extra/citation.html", "extra/citation.json", "extra/citation.txt", "extra/contents.json", "extra/itp.html", "extra/NEWS.html", "extra/NEWS.txt", "extra/readme.html", "extra/readme.md", "manual.pdf" ], "_homeurl": "https://github.com/paulnorthrop/itp", "_realowner": "paulnorthrop", "_cranurl": true, "_releases": [ { "version": "1.0.0", "date": "2022-06-07" }, { "version": "1.0.1", "date": "2022-06-14" }, { "version": "1.1.0", "date": "2022-07-02" }, { "version": "1.2.0", "date": "2022-07-16" }, { "version": "1.2.1", "date": "2023-12-02" }, { "version": "1.2.2", "date": "2026-01-10" } ], "_exports": [ "itp", "itp_c", "xptr_create", "xptr_eval" ], "_help": [ { "page": "itp-package", "title": "itp: The Interpolate, Truncate, Project (ITP) Root-Finding Algorithm", "topics": [ "itp-package" ] }, { "page": "itp", "title": "The ITP root-finding algorithm", "topics": [ "itp" ] }, { "page": "itp_c", "title": "The ITP root-finding algorithm using C++", "topics": [ "itp_c" ] }, { "page": "plot.itp", "title": "Plot method for objects of class '\"itp\"'", "topics": [ "plot.itp" ] }, { "page": "print.itp", "title": "Print method for objects of class '\"itp\"'", "topics": [ "print.itp" ] }, { "page": "xptr_create", "title": "Create an external pointer to a C++ function", "topics": [ "xptr_create" ] }, { "page": "xptr_eval", "title": "Call a C++ function using an external pointer", "topics": [ "xptr_eval" ] } ], "_readme": "https://github.com/paulnorthrop/itp/raw/HEAD/README.md", "_rundeps": [ "Rcpp" ], "_sysdeps": [ { "shlib": "libstdc++", "package": "libstdc++6", "source": "gcc", "version": "16-20260322-1ubuntu1", "name": "c++", "homepage": "http://gcc.gnu.org/", "description": "GNU Standard C++ Library v3" } ], "_vignettes": [ { "source": "itp-vignette.Rmd", "filename": "itp-vignette.html", "title": "Overview of the itp package", "author": "Paul Northrop", "engine": "knitr::rmarkdown", "headings": [ "Supplying to itp an R function", "Well-behaved functions", "Lambert: $f(x) = x e^x - 1$", "Trigonometric 1: $f(x) = \\tan(x - 1 / 10)$", "Ill-behaved functions", "Polynomial 3 (non-simple root): $f(x) = (10^6 x - 1) ^ 3$", "Staircase (discontinuous): $f(x) = \\lceil 10 x - 1 \\rceil + 1/2$", "Warsaw (multiple roots): $f(x) = I(x > -1)\\left(1 + \\sin\\left(\\frac{1}{1+x}\\right)\\right)-1$", "Supplying to itp an external pointer to a C++ function", "C++ function itp_c", "Plot method", "References" ], "created": "2022-05-26 23:49:24", "modified": "2022-07-16 10:49:00", "commits": 13 } ], "_score": 6.290034611362518, "_indexed": true, "_nocasepkg": "itp", "_universes": [ "paulnorthrop" ], "_binaries": [ { "r": "4.7.0", "os": "linux", "version": "1.2.2", "date": "2026-06-24T02:49:01.000Z", "distro": "resolute", "arch": "aarch64", "commit": "06102d9cca48b1ad22ed94e46f567328fc0a5eac", "fileid": "571d675fda78a72aea0efc82cdc05b2f88bad58904a4e7dc0b9f79e3647d52ac", "status": "success", "check": "OK", "buildurl": "https://github.com/r-universe/paulnorthrop/actions/runs/28071500618" }, { "r": "4.7.0", "os": "linux", "version": "1.2.2", "date": "2026-06-24T02:48:55.000Z", "distro": "resolute", "arch": "x86_64", "commit": "06102d9cca48b1ad22ed94e46f567328fc0a5eac", "fileid": "8f43ffbcf82684150a17a6de6acada199221ca4602aaf8586e81d08b8a97f9cb", "status": "success", "check": "OK", "buildurl": "https://github.com/r-universe/paulnorthrop/actions/runs/28071500618" }, { "r": "4.6.0", "os": "linux", "version": "1.2.2", "date": "2026-06-24T02:49:05.000Z", "distro": "resolute", "arch": "aarch64", "commit": "06102d9cca48b1ad22ed94e46f567328fc0a5eac", "fileid": "2c0b109e03cea81e03b50cb1ad0fbea0dcf12c26ff1d1f9010d94129f3649869", "status": "success", "check": "OK", "buildurl": "https://github.com/r-universe/paulnorthrop/actions/runs/28071500618" }, { "r": "4.6.0", "os": "linux", "version": "1.2.2", "date": "2026-06-24T02:48:52.000Z", "distro": "resolute", "arch": "x86_64", "commit": "06102d9cca48b1ad22ed94e46f567328fc0a5eac", "fileid": "561ccab23b93db69e9ab152461a40caaf02669af2782584f048421756787972e", "status": "success", "check": "OK", "buildurl": "https://github.com/r-universe/paulnorthrop/actions/runs/28071500618" }, { "r": "4.5.3", "os": "mac", "version": "1.2.2", "date": "2026-06-24T02:49:14.000Z", "arch": "aarch64", "commit": "06102d9cca48b1ad22ed94e46f567328fc0a5eac", "fileid": "2a0c8154d5adec394017c10bb853bb949385fc02b5f0ef220bd64c4da83999c0", "status": "success", "check": "OK", "buildurl": "https://github.com/r-universe/paulnorthrop/actions/runs/28071500618" }, { "r": "4.5.3", "os": "mac", "version": "1.2.2", "date": "2026-06-24T02:50:10.000Z", "arch": "x86_64", "commit": "06102d9cca48b1ad22ed94e46f567328fc0a5eac", "fileid": "b7a918f15602fdc8d1d34515753d36bb8de09ad52b6e94b104cf019db980488e", "status": "success", "check": "OK", "buildurl": "https://github.com/r-universe/paulnorthrop/actions/runs/28071500618" }, { "r": "4.6.0", "os": "mac", "version": "1.2.2", "date": "2026-06-24T02:49:39.000Z", "arch": "aarch64", "commit": "06102d9cca48b1ad22ed94e46f567328fc0a5eac", "fileid": "06063dad6ae005b3e7237c8fed3ce6d440098209419c79a133dad33e1d0a1315", "status": "success", "check": "OK", "buildurl": "https://github.com/r-universe/paulnorthrop/actions/runs/28071500618" }, { "r": "4.6.0", "os": "mac", "version": "1.2.2", "date": "2026-06-24T02:52:58.000Z", "arch": "x86_64", "commit": "06102d9cca48b1ad22ed94e46f567328fc0a5eac", "fileid": "2b1c7310cede25092aa90d3e595f29e09a6dcd2ff16d102fbff394a941c01ff8", "status": "success", "check": "OK", "buildurl": "https://github.com/r-universe/paulnorthrop/actions/runs/28071500618" }, { "r": "4.6.0", "os": "wasm", "version": "1.2.2", "date": "2026-06-24T02:49:18.000Z", "arch": "emscripten", "commit": "06102d9cca48b1ad22ed94e46f567328fc0a5eac", "fileid": "68dd5395e241da77962374ee8ee22f2bbed6c4bcde959a57787a2bb8369cf804", "status": "success", "buildurl": "https://github.com/r-universe/paulnorthrop/actions/runs/28071500618" }, { "r": "4.7.0", "os": "win", "version": "1.2.2", "date": "2026-06-24T02:48:15.000Z", "arch": "x86_64", "commit": "06102d9cca48b1ad22ed94e46f567328fc0a5eac", "fileid": "9cca139d6af02257b14941ffa85c23facc8ccdf708d49c3760212fbba19f8b11", "status": "success", "check": "OK", "buildurl": "https://github.com/r-universe/paulnorthrop/actions/runs/28071500618" }, { "r": "4.5.3", "os": "win", "version": "1.2.2", "date": "2026-06-24T02:48:11.000Z", "arch": "x86_64", "commit": "06102d9cca48b1ad22ed94e46f567328fc0a5eac", "fileid": "cfbf00a6d4aa47439bb7c0f6257631bfa7253f129f15766fd9bb498fe3649381", "status": "success", "check": "OK", "buildurl": "https://github.com/r-universe/paulnorthrop/actions/runs/28071500618" }, { "r": "4.6.0", "os": "win", "version": "1.2.2", "date": "2026-06-24T02:47:58.000Z", "arch": "x86_64", "commit": "06102d9cca48b1ad22ed94e46f567328fc0a5eac", "fileid": "78bda9b7b36597a6ca0d047b75f2e39300fe2855429eed8af1eaebfcce78f7b3", "status": "success", "check": "OK", "buildurl": "https://github.com/r-universe/paulnorthrop/actions/runs/28071500618" } ] }