R: Set Matrix Element

set.mat {lpSolveAPI} | R Documentation

## Set Matrix Element

### Description

Set the value of a single matrix element in an lpSolve linear program model object.

### Usage

    set.mat(lprec, i, j, value)

### Arguments

`lprec` | an lpSolve linear program model object.
`i` | a single numeric value from the set `{1, ..., m}` (where `m` is the number of constraints in `lprec`) specifying the row of the matrix.
`j` | a single numeric value from the set `{1, ..., n}` (where `n` is the number of decision variables in `lprec`) specifying the column of the matrix.
`value` | a single numeric value.

### 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(4, 2)
    x <- c(6,2,4,9)
    set.column(lps.model, 2, x)
    y <- c(3,1,5)
    ind <- c(1,2,4)
    set.column(lps.model, 1, y, ind)
    set.constr.type(lps.model, rep("<=", 4))

    set.mat(lps.model, 3, 2, 4.5)

[Package lpSolveAPI version 5.5.2.0-17 Index]