R Under development (unstable) (2023-11-08 r85496 ucrt) -- "Unsuffered Consequences"
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> ##
> ##  h or n e r . R  Test Suite
> ##
> 
> 
> horner <- pracma::horner
> hornerdefl <- pracma::hornerdefl
> 
> p <- c(1, 0, 1)
> x <- c(-2, -1, 0, 1, 2)
> identical(horner(p, x)$y, x^2 + 1)
[1] TRUE
> identical(horner(p, x)$dy, 2*x)
[1] TRUE
> 
> p <- c(1, -6, 11, -6)
> identical(hornerdefl(p, 3)$y, 0)
[1] TRUE
> identical(hornerdefl(p, 3)$q, (c(1, -3, 2)))
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.15    0.03    0.15