dissimilarities

Description

The package provides efficient and user-friendly functions for creating, manipulating, and subsetting “dist” objects, which are commonly used in cluster analysis in R.

The current version includes the following features:

• Dist2Mat: Converting a “dist” object to a numeric matrix.
• subDist2Dist: Subsetting a “dist” object to a “dist” object without explicitly converting it to a numeric matrix.
• subDist2Mat: Subsetting a “dist” object to a numeric “matrix” without explicitly converting the object to a numeric matrix.
• subCols: Subsetting a “dist” object to a numeric “matrix” based on some column (equivalently, row) indices.
• fastDist: Computing a “dist” object given a numeric matrix.
• fastDistAB: Computing a numeric “matrix” storing pairwise distances between rows in two matrices.
• get2dFrom1d: Computing 2D-indexing given 1D-indexing (as used in R’s “dist” objects).

Features under development:

• Providing additional distance functions in fastDist and fastDistAB. The current version only supports popular metrics, namely “euclidean”, “manhattan”, “minkowski”, “maximum”, “canberra”, and “cosine”.
• expandDist: Expanding a “dist” object given new data.

### Installation

To download the package, use the following R code:

library(devtools)
install_github("edelweiss611428/dissimilarities")