R Under development (unstable) (2023-11-08 r85496 ucrt) -- "Unsuffered Consequences"
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> ##
> ##  p i e c e w i s e . R  Test suite
> ##
> 
> 
> piecewise <- pracma::piecewise
> 
> x <- c(0, 1,  2, 3, 4, 5)
> y <- c(1, 1, -1, 0, 1, 0)
> identical(piecewise(x, y)$area,  1.5)
[1] TRUE
> identical(piecewise(x, y)$zeros, c(1.5, 3, 5))
[1] TRUE
> identical(piecewise(x, y, abs = TRUE)$area,  3.0)
[1] TRUE
> identical(piecewise(x, y, abs = TRUE)$zeros, c(1.5, 3, 5))
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.12    0.03    0.14