R: converts a tm DocumentTermMatrix or TermDocumentMatrix into a...
as.compressed.matrix
R Documentation
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
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
# 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)