R Under development (unstable) (2023-11-08 r85496 ucrt) -- "Unsuffered Consequences"
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> ###
> ### VANDER.R  +++ Test suite +++
> ###
> 
> test.vander <- function(input, expected) {
+     output <- do.call(getFromNamespace("vander", "pracma"), input)
+     identical(output, expected)
+ }
> 
> vander.expected.empty <- matrix(as.numeric(NA), nrow=0, ncol=0)
> vander.expected.scalar <- matrix(1.0, nrow=1, ncol=1)
> vander.expected.seq3 <- matrix(c( 1,       1,     1,    1,   1,
+                                   5.0625,  3.375, 2.25, 1.5, 1,
+                                  16,       8,     4,    2,   1,
+                                  39.0625, 15.625, 6.25, 2.5, 1,
+                                  81,      27,     9,    3,   1),
+                                nrow=5, ncol=5, byrow=TRUE)
> vander.expected.complex <- matrix(c(-1, 0.0 + 1i, 1.0,
+                                     -4, 0.0 + 2i, 1.0,
+                                     -9, 0.0 + 3i, 1.0),
+                                   nrow=3, ncol=3, byrow=TRUE)
> 
> test.vander(list(x=numeric()), vander.expected.empty)
[1] TRUE
> test.vander(list(x=1), vander.expected.scalar)
[1] TRUE
> test.vander(list(x=seq(from=1, to=3, by=0.5)), vander.expected.seq3)
[1] TRUE
> test.vander(list(x=c(1,2,3)*1i), vander.expected.complex)
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.12    0.06    0.17