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### test-matrixPower.R ---
#----------------------------------------------------------------------
## author: Brice Ozenne
## created: okt 24 2017 (09:21)
## Version:
## last-updated: Jan 12 2022 (14:47)
## By: Brice Ozenne
## Update #: 19
#----------------------------------------------------------------------
##
### Commentary:
##
### Change Log:
#----------------------------------------------------------------------
##
### Code:
## * header
## rm(list = ls())
if(FALSE){ ## already called in test-all.R
library(testthat)
library(lavaSearch2)
}
lava.options(symbols = c("~","~~"))
context("matrixPower")
matrixPower <- lavaSearch2:::matrixPower
## * tests
M <- matrix(rnorm(2e2),20,10)
Sigma <- var(M)
test_that("square root", {
Sigma.half <- matrixPower(Sigma, power = 1/2, symmetric = FALSE)
expect_true(all(abs(crossprod(Sigma.half)-Sigma) < 1e-12))
})
test_that("inverse", {
Sigma.m1 <- matrixPower(Sigma, power = -1, symmetric = FALSE)
expect_equal(Sigma.m1 %*% Sigma,diag(1,NROW(Sigma),NCOL(Sigma)))
})
##----------------------------------------------------------------------
### test-matrixPower.R ends here
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