R Under development (unstable) (2024-10-14 r87233 ucrt) -- "Unsuffered Consequences"
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> library(qwraps2)
> 
> stopifnot(identical(traprule(x = c(0, 0, 1, 1), y = c(0, 1, 1, 0)), 1.0))
> stopifnot(identical(traprule(x = c(0, 0, 1, 1), y = c(0, 2, 1, 0)), 1.5))
> 
> two_to_the_x <- function(x) {
+   2 ** x
+ }
> 
> x <- seq(-1, 3, by = 1)
> stopifnot(identical(traprule(x, two_to_the_x(x)), 11.25))
> 
> x <- seq(-1, 3, length = 100)
> stopifnot(identical(sprintf("%.16f", traprule(x, two_to_the_x(x))), "10.8209200182984446"))
> 
> # error if inputs are of unequal length
> x <- tryCatch(traprule(c(1, 2, 3, 4), c(2, 3)), error = function(e) {e})
> stopifnot(!is.null(x))
> stopifnot(inherits(x, "error"))
> 
> # error if inputs are of length < 2
> x <- tryCatch(traprule(c(1), c(2)), error = function(e) {e})
> stopifnot(!is.null(x))
> stopifnot(inherits(x, "error"))
> 
> proc.time()
   user  system elapsed 
   0.35    0.07    0.42