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)
>  x <- matrix(runif(4), 2, 2)
>  print(x)
          [,1]      [,2]
[1,] 0.9148060 0.2861395
[2,] 0.9370754 0.8304476
> 
>  y <- d2q(x)
>  print(y)
     [,1]                    [,2]                   
[1,] "3929062039/4294967296" "153619993/536870912"  
[2,] "2012354127/2147483648" "3566745395/4294967296"
> 
>  xfoo <- x
>  attr(xfoo, "blurfle") <- "woof!"
>  class(xfoo) <- c("foo", "bar", "baz")
>  yfoo <- d2q(xfoo)
>  print(yfoo)
     [,1]                    [,2]                   
[1,] "3929062039/4294967296" "153619993/536870912"  
[2,] "2012354127/2147483648" "3566745395/4294967296"
attr(,"blurfle")
[1] "woof!"
attr(,"class")
[1] "foo" "bar" "baz"
> 
>  z <- q2d(y)
>  print(z)
          [,1]      [,2]
[1,] 0.9148060 0.2861395
[2,] 0.9370754 0.8304476
> 
>  x - z
     [,1] [,2]
[1,]    0    0
[2,]    0    0
> 
>  foo <- d2q(0.5)
>  print(foo)
[1] "1/2"
>  bar <- q2q(foo)
>  print(bar)
[1] "1/2"
>  bar[1] <- "-15/3"
>  baz <- q2q(bar)
>  print(baz)
[1] "-5"
> 
>  numer <- as.character(seq(-3, 3))
>  denom <- as.character(seq(along = numer))
>  qux <- z2q(numer, denom)
>  print(qux)
[1] "-3"   "-1"   "-1/3" "0"    "1/5"  "1/3"  "3/7" 
> 
>  numer <- seq(-3, 3)
>  denom <- seq(along = numer)
>  qux <- z2q(numer, denom)
>  print(qux)
[1] "-3"   "-1"   "-1/3" "0"    "1/5"  "1/3"  "3/7" 
> 
>  qux <- z2q(numer, denom, canonicalize = FALSE)
>  print(qux)
[1] "-3/1" "-2/2" "-1/3" "0/4"  "1/5"  "2/6"  "3/7" 
> 
> 
> proc.time()
   user  system elapsed 
   0.17    0.04    0.20