R Under development (unstable) (2025-09-17 r88852 ucrt) -- "Unsuffered Consequences"
Copyright (C) 2025 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> # very limited testing, there are so many cases to cover
> 
> require(houba)
Loading required package: houba
> 
> a <- matrix(1:6, 2, 3)
> A <- as.mmatrix(a)
> A[2,] <- A[1,] * 2
> A[,3] <- A[,1] + 5
> stopifnot( all(A[] == c(1, 2, 3, 6, 6, 7)) )
> 
> houba(max.size = 0) # test replacement by memory mapped objects
$max.size
[1] 0

> A <- as.mmatrix(a)
> A[2,] <- A[1,] * 2
> A[,3] <- A[,1] + 5
> stopifnot( all( as.vector(A) == c(1, 2, 3, 6, 6, 7)) )
> 
> 
> 
> proc.time()
   user  system elapsed 
   0.34    0.10    0.43