R: Set Column

set.column {lpSolveAPI} | R Documentation

## Set Column

### Description

Set a column in an lpSolve linear program model object.

### Usage

    set.column(lprec, column, x, indices)

### Arguments

`lprec` | an lpSolve linear program model object.
`column` | a single numeric value from the set `{1, ..., n}` specifying which column to set.
`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` | optional for sparse `x`. 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 set in constraint `indices[i]` in the specified column. The coefficients for the constraints not in `indices` are set to zero. In particular, index `0` is the objective function coefficient in the specified column and is set to zero by default. This argument should be omitted when `length(x) == m`.

### Value

a `NULL` value is invisibly returned.

### Author(s)

Kjell Konis kjell.konis@me.com

### References

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

### Examples

    lps.model <- make.lp(4, 2)
    set.column(lps.model, 2, c(6,2,4,9))
    set.column(lps.model, 1, c(3,1,5), indices = c(1,2,4))

[Package lpSolveAPI version 5.5.2.0-17.7 Index]