lpSolveAPI (version 5.5.2.0-17.6)

get.dual.solution: Get Dual Solution

Description

Retrieve the values of the dual variables (the reduced costs) from a successfully solved lpSolve linear program model object.

Usage

get.dual.solution(lprec)

Arguments

lprec

an lpSolve linear program model object.

Value

a numeric vector containing the values of the dual variables. If an error occurs (for instance lprec has not been successfully solved) a NULL value is returned.

References

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

Examples

# NOT RUN {
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)
xt <- c(4,5,4)
add.constraint(lps.model, xt, "=", 40)
set.objfn(lps.model, c(-3,-4,-3))

solve(lps.model)
get.dual.solution(lps.model)
# }