inst/tinytest/bind_array_6_post/test-postbind_bcnames.R

In broadcast: Broadcasted Array Operations Like 'NumPy'

# set-up ====
enumerate <- 0L
errorfun <- function(tt) {
  
  if(isFALSE(tt)) stop(print(tt))
}


test_make_dimnames <- function(x.dim) {
  out <- lapply(x.dim, \(n)sample(letters, n, replace = TRUE))
  return(out)
}

# note: for safety, test one naming argument at a time. Not multiple simultaneously

################################################################################


# test comnames, 2d ====
x <- array(rnorm(10), c(5, 5), test_make_dimnames(c(5, 5)))
y <- array(rnorm(5), c(1, 5), test_make_dimnames(c(1, 5))) # will be broadcasted
z <- array(rnorm(5), c(5, 5), test_make_dimnames(c(5, 5)))
emptyarray <- array(rnorm(0), c(5, 5, 0))
input <- list(emptyarray, x, y, z)
expected <- array(NA, dim = c(5, 5, 3))
expected[, , 1] <- x
expected[, , 2] <- rep_dim(y, c(5,5))
expected[, , 3] <- z
for(i in c(1, 2, 4)) { # i != the broadcasted input
  dimnames(expected) <- dimnames(input[[i]])
  expect_equal(
    bind_array(input, 3L, name_along = FALSE, comnames_from = i),
    expected
  ) |> errorfun()
  expected <- unname(expected)
  
  enumerate <- enumerate + 1L
}
i <- 3 # i == broadcasted input
dimnames(expected)[[2]] <- dimnames(input[[i]])[[2]]
expect_equal(
  bind_array(input, 3L, name_along = FALSE, comnames_from = i),
  expected
) |> errorfun()
expected <- unname(expected)
enumerate <- enumerate + 1L


# test name_along, 2d ====
x <- array(rnorm(10), c(5, 5), test_make_dimnames(c(5, 5)))
y <- array(rnorm(5), c(1, 5), test_make_dimnames(c(1, 5))) # will be broadcasted
z <- array(rnorm(5), c(5, 5), test_make_dimnames(c(5, 5)))
emptyarray <- array(rnorm(0), c(5, 5, 0))
input <- list(x, emptyarray, y, z)
names(input) <- letters[1:4]
expected <- array(NA, dim = c(5, 5, 3))
expected[, , 1] <- x
expected[, , 2] <- rep_dim(y, c(5,5))
expected[, , 3] <- z
dimnames(expected) <- list(NULL, NULL, letters[c(1, 3:4)])
expect_equal(
  bind_array(input, 3L, name_along = TRUE, comnames_from = NULL),
  expected
)
dimnames(expected) <- list(NULL, NULL, paste0("X", 1:3))
expect_equal(
  bind_array(unname(input), 3L, name_along = TRUE, comnames_from = NULL),
  expected
)
enumerate <- enumerate + 2L