R Under development (unstable) (2023-11-07 r85491 ucrt) -- "Unsuffered Consequences"
Copyright (C) 2023 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.

> ##
> ##  f l i p d i m . R  tests
> ##
> 
> flipdim <- pracma::flipdim
> flipud <- pracma::flipud
> fliplr <- pracma::fliplr
> rot90 <- pracma::rot90
> 
> a <- matrix(c(1,2,3, 4,5,6, 7,8,9, 10,11,12), nrow=3, ncol=4)
> b <- matrix(c(1,2, 3,4), nrow=2, ncol=2, byrow=TRUE)
> 
> identical(flipdim(a, 1), flipud(a))
[1] TRUE
> identical(fliplr(a), matrix(c(10,11,12, 7,8,9, 4,5,6, 1,2,3 ), 3, 4))
[1] TRUE
> identical(rot90(b, k=1), matrix(c(2,1, 4,3), 2, 2))
[1] TRUE
> identical(rot90(b, k=6), matrix(c(4,2, 3,1), 2, 2))
[1] TRUE
> identical(rot90(b, k=-1), matrix(c(3,4, 1,2), 2, 2))
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.10    0.06    0.15