rowops: Elementary row operations

Description Usage Arguments Details Value See Also Examples

Description

These are elementary operations for a matrix. They do not presume a square matrix and will work on any matrix. They use R's internal row addressing to function.

Usage

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swaprows(m, row1, row2)

replacerow(m, row1, row2, k)

scalerow(m, row, k)

Arguments

m

a matrix

row1

a source row

row2

a destination row

k

a scaling factor

row

a row to modify

Details

replacerow replaces one row with the sum of itself and the multiple of another row. swaprows swap two rows in the matrix. scalerow scales all enteries in a row by a constant.

Value

the modified matrix

See Also

Other linear: choleskymatrix, detmatrix, gdls, invmatrix, iterativematrix, lumatrix, refmatrix, tridiagmatrix, vecnorm

Examples

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n <- 5
A <- matrix(sample.int(10, n^2, TRUE) - 1, n)
A <- swaprows(A, 2, 4)
A <- replacerow(A, 1, 3, 2)
A <- scalerow(A, 5, 10)

cmna documentation built on June 20, 2017, 9:08 a.m.