add.column {lpSolveAPI}R Documentation

Add Column

Description

Add a column to an lpSolve linear program model object.

Usage

add.column(lprec, x, indices = 1:m)

Arguments

lprec an lpSolve linear program model object.
x a numeric vector containing the elements (only the nonzero elements if indices is also given) to be used in the added column. The length of x must be equal to the number of constraints in lprec unless indices is provided.
indices a numeric vector the same length as x of unique values from the set {0, ..., m} where m is the number of constraints in lprec; x[i] is entered into constraint indices[i] in the added column. The coefficients for the constraints not in indices are set to zero. In particular, index 0 is the objective function coefficient in the added column and is set to zero by default.

Details

This function adds an additional column to an lpSolve linear program model object. If multiple columns are to be added, performance can be improved by calling resize.lp before adding the columns.

Value

a logical value is invisibly returned: TRUE indicates that the operation was successful and FALSE indicates that an error occurred.

Author(s)

Kjell Konis kjell.konis@epfl.ch

References

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

See Also

resize.lp

Examples

lps.model <- make.lp(4, 0)

x <- c(6,2,4,9)
add.column(lps.model, x)

y <- c(3,1,5)
ind <- c(1,2,4)
add.column(lps.model, y, ind)

[Package lpSolveAPI version 5.5.0.14 Index]