eigenvec: Eigenvector/Eigenvalue Decomposition

In OpenMx: Extended Structural Equation Modelling

Eigenvector/Eigenvalue Decomposition

Description

eigenval computes the real parts of the eigenvalues of a square matrix. eigenvec computes the real parts of the eigenvectors of a square matrix. ieigenval computes the imaginary parts of the eigenvalues of a square matrix. ieigenvec computes the imaginary parts of the eigenvectors of a square matrix. eigenval and ieigenval return nx1 matrices containing the real or imaginary parts of the eigenvalues, sorted in decreasing order of the modulus of the complex eigenvalue. For eigenvalues without an imaginary part, this is equivalent to sorting in decreasing order of the absolute value of the eigenvalue. (See Mod for more info.) eigenvec and ieigenvec return nxn matrices, where each column corresponds to an eigenvector. These are sorted in decreasing order of the modulus of their associated complex eigenvalue.

Usage

eigenval(x)
eigenvec(x)
ieigenval(x)
ieigenvec(x)

Arguments

x	the square matrix whose eigenvalues/vectors are to be calculated.

Details

Eigenvectors returned by eigenvec and ieigenvec are normalized to unit length.

See Also

eigen

Examples

A <- mxMatrix(values = runif(25), nrow = 5, ncol = 5, name = 'A')
G <- mxMatrix(values = c(0, -1, 1, -1), nrow=2, ncol=2, name='G')

model <- mxModel(A, G, name = 'model')

mxEval(eigenvec(A), model)
mxEval(eigenvec(G), model)
mxEval(eigenval(A), model)
mxEval(eigenval(G), model)
mxEval(ieigenvec(A), model)
mxEval(ieigenvec(G), model)
mxEval(ieigenval(A), model)
mxEval(ieigenval(G), model)

OpenMx documentation built on Oct. 19, 2024, 9:06 a.m.