R Under development (unstable) (2023-11-08 r85496 ucrt) -- "Unsuffered Consequences"
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> ##
> ##  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 
   0.18    0.03    0.15