Nothing
test_that("Gramacy & Lee function example works", {
gramacy_lee <- function(x) {
stopifnot(is.numeric(x))
stopifnot(length(x) == 1)
f <- expression(sin(10 * pi * x) / (2 * x) + (x - 1)^4)
g <- D(f, "x")
h <- D(g, "x")
f <- eval(f)
g <- eval(g)
h <- eval(h)
list(value = f, gradient = g, hessian = as.matrix(h))
}
expect_snapshot(vntrs(f = gramacy_lee, npar = 1, seed = 1))
})
test_that("Shubert function example works", {
shubert <- function(x) {
stopifnot(is.numeric(x))
stopifnot(length(x) == 2)
f <- expression(
(cos(2 * x1 + 1) + 2 * cos(3 * x1 + 2) + 3 * cos(4 * x1 + 3) + 4 * cos(5 * x1 + 4) +
5 * cos(6 * x1 + 5)) *
(cos(2 * x2 + 1) + 2 * cos(3 * x2 + 2) + 3 * cos(4 * x2 + 3) + 4 * cos(5 * x2 + 4) +
5 * cos(6 * x2 + 5))
)
g1 <- D(f, "x1")
g2 <- D(f, "x2")
h11 <- D(g1, "x1")
h12 <- D(g1, "x2")
h22 <- D(g2, "x2")
x1 <- x[1]
x2 <- x[2]
f <- eval(f)
g <- c(eval(g1), eval(g2))
h <- rbind(c(eval(h11), eval(h12)), c(eval(h12), eval(h22)))
list(value = f, gradient = g, hessian = h)
}
expect_snapshot(vntrs(f = shubert, npar = 2, seed = 1))
})
test_that("Rosenbrock function example works", {
rosenbrock <- function(x) {
stopifnot(is.numeric(x))
stopifnot(length(x) == 2)
f <- expression(100 * (x2 - x1^2)^2 + (1 - x1)^2)
g1 <- D(f, "x1")
g2 <- D(f, "x2")
h11 <- D(g1, "x1")
h12 <- D(g1, "x2")
h22 <- D(g2, "x2")
x1 <- x[1]
x2 <- x[2]
f <- eval(f)
g <- c(eval(g1), eval(g2))
h <- rbind(c(eval(h11), eval(h12)), c(eval(h12), eval(h22)))
list(value = f, gradient = g, hessian = h)
}
expect_snapshot(vntrs(f = rosenbrock, npar = 2, seed = 1))
})
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.