set.type {lpSolveAPI}R Documentation

Set Type

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 logical vector indicating whether the types were successfully set.

Author(s)

Kjell Konis kjell.konis@epfl.ch

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)

[Package lpSolveAPI version 5.5.0.14 Index]