Dtm2Tcm: Turn a document term matrix into a term co-occurrence matrix

In textmineR: Functions for Text Mining and Topic Modeling

Description

Turn a document term matrix, whose rows index documents and whose columns index terms, into a term co-occurrence matrix. A term co-occurrence matrix's rows and columns both index terms. See details, below.

Usage

Dtm2Tcm(dtm)

Arguments

dtm	A document term matrix, generally of class dgCMatrix, though other classes, such as dgTMatrix, may also work without issue.

Value

Returns a square dgCMatrix whose rows and columns both index terms. The i, j entries of this matrix represent the count of term j across documents containing term i. Note that, while square, this matrix is not symmetric.

Examples

data(nih_sample_dtm)

tcm <- Dtm2Tcm(nih_sample_dtm)

Example output

Loading required package: Matrix

textmineR documentation built on June 28, 2021, 9:08 a.m.