converts a tm DocumentTermMatrix or TermDocumentMatrix into a matrix.csr representation.

Description

Converts a DocumentTermMatrix or TermDocumentMatrix (package tm), Matrix (package Matrix), matrix.csr (SparseM), data.frame, or matrix into a matrix.csr representation to be used in the maxent and predict.maxent functions.

Usage

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as.compressed.matrix(DocumentTermMatrix)

Arguments

DocumentTermMatrix

A class of type DocumentTermMatrix or TermDocumentMatrix (package tm), Matrix (package Matrix), matrix.csr (SparseM), data.frame, or matrix.

Value

A matrix.csr representation of the DocumentTermMatrix or TermDocumentMatrix (package tm), Matrix (package Matrix), matrix.csr (SparseM), data.frame, or matrix.

Author(s)

Timothy P. Jurka <tpjurka@ucdavis.edu>

Examples

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# LOAD LIBRARY
library(maxent)

# READ THE DATA, PREPARE THE CORPUS, and CREATE THE MATRIX
data <- read.csv(system.file("data/NYTimes.csv.gz",package="maxent"))
corpus <- Corpus(VectorSource(data$Title[1:150]))
matrix <- DocumentTermMatrix(corpus)

# CREATE A MATRIX.CSR (SPARSEM) REPRESENTATION
sparse <- as.compressed.matrix(matrix)