`R/corpus_functions.R`

`Dtm2Tcm.Rd`

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)`

- dtm
A document term matrix, generally of class

`dgCMatrix`

, though other classes, such as`dgTMatrix`

, may also work without issue.

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.

```
data(nih_sample_dtm)
tcm <- Dtm2Tcm(nih_sample_dtm)
```