R: Get Kind

get.kind {lpSolveAPI} | R Documentation

## Get Kind

### Description

Retrieve the kind of a decision variable from an lpSolve linear program model object.

### Usage

    get.kind(lprec, columns = 1:n)

### 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 the columns for which the kind will be retrieved.

### Details

Decision variables have both a type and a kind. The type is either `real` or `integer` and indicates the type of values the decision variable may take. The kind is one of `{standard, semi-continuous, SOS}`. Semi-continuous decision variables can take allowed values between their upper and lower bound as well as zero. Please see the link in the references for a discussion of special ordered set (SOS) constraints.

### Value

a character vector containing the kind of each decision variable specified in `columns`.

### Author(s)

Kjell Konis kjell.konis@me.com

### References

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

### 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)
    xt <- c(4,5,4)
    add.constraint(lps.model, xt, "=", 40)
    set.objfn(lps.model, c(-3,-4,-3))

    get.kind(lps.model)

[Package lpSolveAPI version 5.5.2.0-17.7 Index]