R Under development (unstable) (2024-05-02 r86512 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> library(phoenix)
> set.seed(42)
> inputs <- expand.grid(sbp = rnorm(n = 500, mean = 80, sd = 10),
+                       dbp = rnorm(n = 500, mean = 55, sd = 11))
> 
> pkg <- with(inputs, map(sbp, dbp))
> 
> x1 <- with(inputs, 2/3 * dbp + 1/3 * sbp)
> x2 <- with(inputs, dbp + (sbp - dbp) / 3)
> 
> stopifnot(isTRUE(all.equal(x1, x2)))
> stopifnot(isTRUE(all.equal(pkg, x1)))
> stopifnot(isTRUE(all.equal(pkg, x2)))
> 
> ################################################################################
> #                                 End of File                                  #
> ################################################################################
> 
> proc.time()
   user  system elapsed 
   0.17    0.01    0.18