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The Weyl Algebra
A suite of routines for Weyl algebras. Notation follows
Coutinho (1995, ISBN 0-521-55119-6, "A Primer of Algebraic
D-Modules"). Uses 'disordR' discipline
(Hankin 2022
Fast Symbolic Multivariate Polynomials
Fast manipulation of symbolic multivariate polynomials
using the 'Map' class of the Standard Template Library. The package
uses print and coercion methods from the 'mpoly' package but
offers speed improvements. It is comparable in speed to the 'spray'
package for sparse arrays, but retains the symbolic benefits of
'mpoly'. To cite the package in publications, use Hankin 2022
Extra Functionality for 'leaflet' Package
The 'leaflet' JavaScript library provides many plugins some of which are available in the core 'leaflet' package, but there are many more. It is not possible to support them all in the core 'leaflet' package. This package serves as an add-on to the 'leaflet' package by providing extra functionality via 'leaflet' plugins.
Display Tournament Fixtures using Knock Out and Round Robin Techniques
Use of Knock Out and Round Robin Techniques in preparing tournament fixtures as discussed in the Book Health and Physical Education by 'Dr. V K Sharma'(2018,ISBN:978-93-5272-134-4).
Distances on Directed Graphs
Distances on dual-weighted directed graphs using
priority-queue shortest paths (Padgham (2019)
Joint Segmentation of Correlated Time Series
It contains a function designed to the joint segmentation in the mean of several correlated series. The method is described in the paper X. Collilieux, E. Lebarbier and S. Robin. A factor model approach for the joint segmentation with between-series correlation (2015)
The Symmetric Group: Permutations of a Finite Set
Manipulates invertible functions from a finite set to
itself. Can transform from word form to cycle form and
back. To cite the package in publications please use
Hankin (2020) "Introducing the permutations R package",
SoftwareX, volume 11
Optimisation with Continuous Convex Piecewise (Linear and Quadratic) Functions
Continuous convex piecewise linear (ccpl) resp. quadratic (ccpq) functions can be implemented with sorted breakpoints and slopes. This includes functions that are ccpl (resp. ccpq) on a convex set (i.e. an interval or a point) and infinite out of the domain. These functions can be very useful for a large class of optimisation problems. Efficient manipulation (such as log(N) insertion) of such data structure is obtained with map standard template library of C++ (that hides balanced trees). This package is a wrapper on such a class based on Rcpp modules.
Discrimination/Classification in very high dimension with linear and quadratic rules.
This package provides an implementation of Linear discriminant analysis and quadratic discriminant analysis that works fine in very high dimension (when there are many more variables than observations).
Poisson Lognormal Models
The Poisson-lognormal model and variants (Chiquet,
Mariadassou and Robin, 2021