removeSparseTerms: Remove Sparse Terms from a Term-Document Matrix
In tm: Text Mining Package

Description Usage Arguments Value Examples

Remove sparse terms from a document-term or term-document matrix.

1	removeSparseTerms(x, sparse)

`x`	A `DocumentTermMatrix` or a `TermDocumentMatrix`.
`sparse`	A numeric for the maximal allowed sparsity in the range from bigger zero to smaller one.

A term-document matrix where those terms from x are removed which have at least a sparse percentage of empty (i.e., terms occurring 0 times in a document) elements. I.e., the resulting matrix contains only terms with a sparse factor of less than sparse.

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data("crude")
tdm <- TermDocumentMatrix(crude)
removeSparseTerms(tdm, 0.2)

Loading required package: NLP
<<TermDocumentMatrix (terms: 5, documents: 20)>>
Non-/sparse entries: 94/6
Sparsity           : 6%
Maximal term length: 6
Weighting          : term frequency (tf)