query {rswipl}

Create a query

Description

Create a query

Usage

query(
  q = call("member", expression(X), list(quote(a), "b", 3L, 4, TRUE, expression(Y)))
)

Arguments

q

an R call. The R call consists of symbols, integers and real numbers, character strings, boolean values, expressions, lists, and other calls. Vectors of booleans, integers, floating point numbers, and strings with length N > 1 are translated to prolog compounds !/N, %/N, #/N and $$/N, respectively.

Details

SWI-Prolog does not allow multiple open queries. If another query is open, it it is closed and a warning is shown.

Value

If the creation of the query succeeds, TRUE

See Also

submit() for submitting a query

clear() to close the currently open query

Examples

q <- query(call("member", 1, expression(X)))
submit()
submit()
clear()