Nothing
context("principal_components_result")
set.seed(123)
x <- matrix(rnorm(200*3), ncol = 10)
pca <- principal_components(x)
test_that("principal_components_result provides proper messages and warnings", {
expect_that(principal_components_result(), throws_error())
expect_that(principal_components_result(pca, results = 6), throws_error())
expect_that(principal_components_result(pca, results = "wrong"), throws_error())
})
test_that("principal_components_result output has correct dimensions", {
expect_equal(principal_components_result(pca) %>% length, 100)
expect_equal(principal_components_result(pca, 1) %>% length(), 10)
expect_equal(principal_components_result(pca, 2) %>% dim(), c(10, 10))
expect_equal(principal_components_result(pca, 3) %>% dim(), c(60, 10))
expect_equal(principal_components_result(pca, 4) %>% length(), 10)
expect_equal(principal_components_result(pca, 5) %>% length(), 1)
expect_equal(principal_components_result(pca, pca_sdev) %>% length(), 10)
expect_equal(principal_components_result(pca, pca_loadings) %>% dim(), c(10, 10))
expect_equal(principal_components_result(pca, pca_rotated) %>% dim(), c(60, 10))
expect_equal(principal_components_result(pca, pca_center) %>% length(), 10)
expect_equal(principal_components_result(pca, pca_scale) %>% length(), 1)
})
test_that("principal_components_result gets the right output", {
expect_equal(principal_components_result(pca) %>% .[1] %>% round(3), 0.315)
expect_equal(principal_components_result(pca, 1) %>% .[1] %>% round(3), 1.303)
expect_equal(principal_components_result(pca, 2) %>% .[[1,1]] %>% round(2), 0.31)
expect_equal(principal_components_result(pca, 3) %>% .[[1,1]] %>% round(2), -1.33)
expect_equal(principal_components_result(pca, 4) %>% .[[1]] %>% round(2), 0.07)
expect_true(principal_components_result(pca, 5) %>% !.)
})
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