Nothing
context("Test implementation of gower distance ...")
P <- 1:10 / sum(1:10)
Q <- 20:29 / sum(20:29)
V <- -10:10
W <- -20:0
# function to test distance matrix functionality
# for different distance measures
test_dist_matrix <- function(x, FUN) {
dist.fun <- match.fun(FUN)
res.dist.matrix <- matrix(NA_real_, nrow(x), nrow(x))
for (i in 1:nrow(x)) {
for (j in 1:nrow(x)) {
res.dist.matrix[i, j] <- dist.fun(x[i,], x[j,])
}
}
return(res.dist.matrix[lower.tri(res.dist.matrix, diag = FALSE)])
}
test_gower_dist <- function(P, Q) {
return((1 / length(P)) * sum(abs((P) - (Q))))
}
test_that("distance(method = 'gower') computes the correct distance value.",
{
expect_equal(as.vector(philentropy::distance(rbind(P, Q), method = "gower")),
test_gower_dist(P, Q))
# test correct computation of distance matrix
distMat <-
rbind(rep(0.2, 5), rep(0.1, 5), c(5, 1, 7, 9, 5))
dist.vals <- distance(distMat, method = "gower")
expect_equal(dist.vals[lower.tri(dist.vals, diag = FALSE)],
test_dist_matrix(distMat, FUN = test_gower_dist))
})
test_that("Correct gower distance is computed when vectors contain 0 values ...",
{
P1 <- c(1, 0)
P2 <- c(0.5, 0.5)
Q1 <- c(0.5, 0.5)
Q2 <- c(1, 0)
distMat <-
rbind(P1, Q1, P2, Q2)
dist.vals <-
distance(distMat, method = "gower")
expect_equal(dist.vals[lower.tri(dist.vals, diag = FALSE)],
test_dist_matrix(distMat, FUN = test_gower_dist))
})
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