lotri (version 1.0.0)

rcm: Use the RCM algorithm to permute to banded matrix

Description

The RCM stands for the reverse Cuthill McKee (RCM) algorithm which is used to permute the matrix to a banded matrix.

Usage

rcm(x)

Value

A permuted matrix that should be banded

Arguments

x

A symmetric matrix

Examples

m <- lotri({
 a + b + c + d + e + f + g + h + i + j + k + l + m + n + o +
 p ~ c(0.4, 0, 0.3, 0, 0, 0, -0.1, 0, 0, 0.2, 0, 0, 0,
       0, 0.5, 0, 0, 0, 0, 0, 1.3, 0, 0, 0, 0, 0, -0.6, 0.8,
       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.2,
       0, 0, 0, 0, 0, 0, 0, 0, 0, 0.9, 0, 0, 0, 0, 0, 0, 0,
       0, 0, 0, 0.9, 0, 0, 0, 0, 0, 0, 0, 0, 0, -0.2, 0, 0.3,
       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2.1, 0.2, 0, 0, 0.2,
       0, 0, 0, 0, 0, 0, 0, 0, 0, 0.4, 0, 0, 0, 0, 0, -1.1,
       0.9, 0, 0, 0, 0, 0, 0, 0, 4.7, 0, 0, 0, 0, 0, 0, 0, 0,
       0, 0.5, 0, 0.2, 0, 0, 0, 1.9)
})

rcm(m)