R Under development (unstable) (2025-09-17 r88852 ucrt) -- "Unsuffered Consequences"
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> # trying to cover many methods -- not all of them
> require(houba)
Loading required package: houba
> 
> x <- as.mvector(2**(1:4))
> y <- 2*x
> x <- x/2
> x <- x + c(1,2) / y - y / c(1, 2)
> x <- -x * c(64, 128)
> stopifnot( all(x[] == c(176, 224, 764, 1016)) )
> stopifnot( all((x / (y * 0.25))[] == c(176, 112, 191, 127)) )
> stopifnot( all((x * y / 64)[] == c(11, 28, 191, 508)) )
> stopifnot( all(((x - 1:2) + 2:1)[] == c(177, 223, 765, 1015) ) )
> stopifnot( all(((2:1 + x) - 1:2)[] == c(177, 223, 765, 1015) ) )
> 
> x <- as.mvector(2**(1:4))
> dim(x) <- c(2,2)
> y <- 2*x
> x <- x/2
> x <- x + c(1,2) / y - y / c(1, 2)
> x <- -x * c(64, 128)
> stopifnot( all(x[] == c(176, 224, 764, 1016)) )
> stopifnot( all((x / (y * 0.25))[] == c(176, 112, 191, 127)) )
> stopifnot( all((x * y / 64)[] == c(11, 28, 191, 508)) )
> stopifnot( all(((x - 1:2) + 2:1)[] == c(177, 223, 765, 1015) ) )
> stopifnot( all(((2:1 + x) - 1:2)[] == c(177, 223, 765, 1015) ) )
> 
> x <- as.mvector(2**(1:4))
> dim(x) <- c(2,1,2)
> y <- 2*x
> x <- x/2
> x <- x + c(1,2) / y - y / c(1, 2)
> x <- -x * c(64, 128)
> stopifnot( all(x[] == c(176, 224, 764, 1016)) )
> stopifnot( all((x / (y * 0.25))[] == c(176, 112, 191, 127)) )
> stopifnot( all((x * y / 64)[] == c(11, 28, 191, 508)) )
> stopifnot( all(((x - 1:2) + 2:1)[] == c(177, 223, 765, 1015) ) )
> stopifnot( all(((2:1 + x) - 1:2)[] == c(177, 223, 765, 1015) ) )
> 
> 
> proc.time()
   user  system elapsed 
   0.39    0.15    0.53