R Under development (unstable) (2025-09-17 r88852 ucrt) -- "Unsuffered Consequences"
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> require(houba)
Loading required package: houba
> x <- as.mvector( 2**(1:3) )
> inplace.inverse(x)
> inplace.opposite(x)
> inplace.sum(x, 0.5)
> inplace.prod(x, 8)
> stopifnot( all(x[] == c(0,2,3)) )
> 
> inplace.minus(x, 2)
> inplace.div(x, 2)
> stopifnot( all(x[] == c(-1,0,0.5)) )
> 
> x <- as.mvector( 2**(1:3) )
> y <- copy(x)
> inplace.prod(x, y)
> inplace.sum(x, x)
> inplace.div(x, y)
> inplace.minus(x, y)
> stopifnot( all(x[] == y[]) )
> 
> proc.time()
   user  system elapsed 
   0.37    0.09    0.40