R Under development (unstable) (2025-09-17 r88852 ucrt) -- "Unsuffered Consequences"
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> require(houba)
Loading required package: houba
> a <- matrix(1:24, 4, 6)
> A <- as.mmatrix(a, "float")
> 
> stopifnot( all(colSums(A) == colSums(a)) )
> stopifnot( all(colMeans(A) == colMeans(a)) )
> stopifnot( all(rowSums(A) == rowSums(a)) )
> stopifnot( all(rowMeans(A) == rowMeans(a)) )
> 
> houba(max.size = 2)
$max.size
[1] 2

> B <- colSums(A)
> stopifnot( is(B, "mvector"))
> stopifnot( all(as.vector(B) == colSums(a)) )
> 
> B <- colMeans(A)
> stopifnot( is(B, "mvector"))
> stopifnot( all(as.vector(B) == colMeans(a)) )
> 
> B <- rowSums(A)
> stopifnot( is(B, "mvector"))
> stopifnot( all(as.vector(B) == rowSums(a)) )
> 
> B <- rowMeans(A)
> stopifnot( is(B, "mvector"))
> stopifnot( all(as.vector(B) == rowMeans(a)) )
> 
> 
> proc.time()
   user  system elapsed 
   0.37    0.10    0.40