R Under development (unstable) (2023-04-23 r84305 ucrt) -- "Unsuffered Consequences"
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> 
>  library(rcdd)
If you want correct answers, use rational arithmetic.
See the Warnings sections in help pages for
    functions that do computational geometry.
> 
>  set.seed(42)
> 
>  n <- 50
>  d <- 5
>  x <- matrix(rnorm(n * d), nrow = n)
>  x <- d2q(x)
> 
>  foo <- cbind("0", cbind("1", x))
>  # in order to get the same results as before save and restore .Random.seed
>  # because sccd now calls R RNG
>  save.Random.seed <- .Random.seed
>  out <- scdd(foo, representation = "V")
>  .Random.seed <- save.Random.seed
> 
>  l <- out$output[ , 1]
>  b <- out$output[ , 2]
>  a <- out$output[ , - c(1, 2)]
>  a <- qxq(a, rep(-1, length(a)))
> 
>  unique(l)
[1] "0"
> 
>  axb <- qmatmult(a, t(x))
>  axb <- sweep(axb, 1, b, FUN = qmq)
>  fred <- apply(axb, 2, function(foo) max(qsign(foo)))
> 
>  all(fred <= 0)
[1] TRUE
>  ### points in interior
>  sum(fred < 0)
[1] 8
>  ### points on boundary
>  sum(fred == 0)
[1] 42
> 
>  ### try on some new points
> 
>  y <- matrix(rnorm(2 * n * d), nrow = 2 * n)
>  y <- d2q(y)
> 
>  ### REVISED DOWN TO HERE
> 
>  ayb <- qmatmult(a, t(y))
>  ayb <- sweep(ayb, 1, b, FUN = qmq)
>  fred <- apply(ayb, 2, function(foo) max(qsign(foo)))
> 
>  ### points in interior
>  sum(fred < 0)
[1] 24
>  ### points on boundary
>  sum(fred == 0)
[1] 0
>  ### points in exterior
>  sum(fred > 0)
[1] 76
> 
> 
> proc.time()
   user  system elapsed 
   8.25    0.09    8.32