psychonetrics (version 0.13)

duplicationMatrix: Model matrices used in derivatives

Description

These matrices are used in the analytic gradients

Usage

duplicationMatrix(n, diag = TRUE)
eliminationMatrix(n, diag = TRUE)
diagonalizationMatrix(n)

Value

A sparse matrix

Arguments

n

Number of rows and columns in the original matrix

diag

Logical indicating if the diagonal should be included (set to FALSE for derivative of vech(x))

Author

Sacha Epskamp

Examples

# Duplication matrix for 10 variables:
duplicationMatrix(10)

# Elimination matrix for 10 variables:
eliminationMatrix(10)

# Diagonailzation matrix for 10 variables:
diagonalizationMatrix(10)