R: Query (Matrices)

query {lsa} | R Documentation

## Query (Matrices)

### Description

Create a query in the format of a given textmatrix.

### Usage

    query ( qtext, termlist, stemming=FALSE, language="german" )

### Arguments

`termlist` | the termlist of the background latent-semantic space.
`language` | specifies a language for stemming / stop-word-removal.
`stemming` | boolean, specifies whether all terms will be reduced to their wordstems.
`qtext` | the query string, words are separated by blanks.

### Details

Create queries, i.e., an additional term vector to be used for query-to-document comparisons, in the format of a given textmatrix.

### Value

`query` | returns the query vector (based on the given vocabulary) as matrix.

### Author(s)

Fridolin Wild f.wild@open.ac.uk

### See Also

`wordStem`, `textmatrix`

### Examples

    # prepare some files
    td = tempfile()
    dir.create(td)
    write( c("dog", "cat", "mouse"), file=paste(td,"D1", sep="/") )
    write( c("hamster", "mouse", "sushi"), file=paste(td,"D2", sep="/") )
    write( c("dog", "monster", "monster"), file=paste(td,"D3", sep="/") )

    # demonstrate generation of a query
    dtm = textmatrix(td)
    query("monster", rownames(dtm))
    query("monster dog", rownames(dtm))

    # clean up
    unlink(td, TRUE)

[Package lsa version 0.73.1 Index]