context("Sampling points from a sphere")
test_that("Sampling sphere surface works", {
library(igraph)
library(digest)
set.seed(42)
s1 <- sample_sphere_surface(4, 100, positive=FALSE)
expect_that(colSums(s1^2), equals(rep(1, 100)))
s2 <- sample_sphere_surface(3, 100, radius=2, positive=FALSE)
expect_that(sqrt(colSums(s2^2)), equals(rep(2, 100)))
s3 <- sample_sphere_surface(2, 100, radius=1/2, positive=TRUE)
expect_that(sqrt(colSums(s3^2)), equals(rep(1/2, 100)))
expect_true(all(s3 >= 0))
})
test_that("Sampling sphere volume works", {
library(igraph)
library(digest)
set.seed(42)
s1 <- sample_sphere_volume(4, 10000, positive=FALSE)
expect_true(all(colSums(s1^2) < 1))
s2 <- sample_sphere_volume(3, 100, radius=2, positive=FALSE)
expect_true(all(sqrt(colSums(s2^2)) < 2))
s3 <- sample_sphere_volume(2, 100, radius=1/2, positive=TRUE)
expect_true(all(sqrt(colSums(s3^2)) < 1/2))
expect_true(all(s3 >= 0))
})
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