Turn a document term matrix, whose rows index documents and
whose columns index terms, into a term co-occurrence matrix. A term co-occurrence
matrix's rows and columns both index terms. See `details`

, below.

Dtm2Tcm(dtm)

## Arguments

dtm |
A document term matrix, generally of class `dgCMatrix` , though
other classes, such as `dgTMatrix` , may also work without issue. |

## Value

Returns a square `dgCMatrix`

whose rows and columns both index
terms. The i, j entries of this matrix represent the count of term j across
documents containing term i. Note that, while square, this matrix is not
symmetric.

## Examples