Remove sparse terms from a document-term or term-document matrix.
removeSparseTerms(x, sparse)
A DocumentTermMatrix
or a
TermDocumentMatrix
.
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
.
# NOT RUN { data("crude") tdm <- TermDocumentMatrix(crude) removeSparseTerms(tdm, 0.2) # }