Write a .ldac file

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Description

A function for writing documents out to a .ldac formated file.

Usage

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writeLdac(documents, file, zeroindex=TRUE)

Arguments

documents

A documents object to be written out to a file. Object must be a list of with each element corresponding to a document. Each document is represented as an integer matrix with two rows, and columns equal to the number of unique vocabulary words in the document. The first row contains the 1-indexed vocabulary entry and the second row contains the number of times that term appears

file

A character string giving the name of the file to be written. This object is passed directly to the argument con in writeLines and thus can be a connection object as well.

zeroindex

logical. If TRUE (the default) it subtracts one from each index. If FALSE it uses the indices as given. The standard .ldac format indexes from 0 as per standard convention in most languages. Our documents format indexes from 1 to abide by conventions in R. This option converts to the zero index by default.

Details

This is a simple convenience function for writing out document corpora. Files can be read back into R using readCorpus or simply used for other programs. The output is a file in the .ldac sparse matrix format popularized by Dave Blei's C code for LDA.

See Also

readCorpus

Examples

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## Not run: 
#Convert the gadarian data into documents format
temp<-textProcessor(documents=gadarian$open.ended.response,metadata=gadarian)
documents <- temp$documents
#Now write out to an ldac file
writeLdac(documents, file="gadarian.ldac")

## End(Not run)

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