R: Set Objective Function

set.objfn {lpSolveAPI} | R Documentation

## Set Objective Function

### Description

Set the objective function in an lpSolve linear program model object.

### Usage

    set.objfn(lprec, obj, indices)

### Arguments

`lprec` | an lpSolve linear program model object.
`obj` | a numeric vector of length `n` (where n is the number of decision variables in `lprec`) containing the coefficients of the objective function. Alternatively, if `indices` is also provided, a numeric vector of the same length as `indices` containing only the nonzero coefficients.
`indices` | optional for sparse `obj`. A numeric vector the same length as `obj` of unique values from the set {1, ..., n} where n is the number of decision variables in `lprec`; `obj[i]` is entered into column `indices[i]` in objective function. The coefficients for the columns not in `indices` are set to zero. This argument should be omitted when `length(obj) == n`.

### Value

a `NULL` value is invisibly returned.

### Author(s)

Kjell Konis kjell.konis@me.com

### References

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

### See Also

`resize.lp`

### Examples

    lps.model <- make.lp(2, 4)
    set.objfn(lps.model, c(1,2,3,4))
    set.objfn(lps.model, c(5,7,6), indices = c(1,2,4))

[Package lpSolveAPI version 5.5.2.0-17.7 Index]