set.type: Set Type

In lpSolveAPI: R Interface to 'lp_solve' Version 5.5.2.0

Description

Set the type of a decision variable in an lpSolve linear program model object.

Usage

set.type(lprec, columns, type = c("integer", "binary", "real"))

Arguments

lprec	an lpSolve linear program model object.
columns	a numeric vector of unique values from the set {1, ..., n} (where n is the number of decision variables in lprec) specifying which variables are to have their type set.
type	either "integer", "binary" or "real". The decision variables in columns will have their type set to this value.

Details

A binary decision variable is simply an integer decision with an upper bound of one and a lower bound of zero. When type = "binary" the type of the decision variable will be set to "integer" and the bounds will be set to zero and one respectively.

Value

a NULL value is invisibly returned.

Author(s)

Kjell Konis [e-mail]

References

http://lpsolve.sourceforge.net/5.5/index.htm

See Also

set.type

Examples

lps.model <- make.lp(0, 3)
xt <- c(6,2,4)
add.constraint(lps.model, xt, "<=", 150)
xt <- c(1,1,6)
add.constraint(lps.model, xt, ">=", 0)
set.type(lps.model, 2, "binary")
xt <- c(4,5,4)
add.constraint(lps.model, xt, "=", 40)
set.type(lps.model, 3, "integer")
set.objfn(lps.model, c(-3,-4,-3))

get.type(lps.model)

Example output

[1] "real"    "integer" "integer"

lpSolveAPI documentation built on May 2, 2019, 6:50 p.m.