https://github.com/cran/pracma
Revision 26e049d70b4a1c237987e260cba68f6a9413736c authored by Hans W. Borchers on 09 April 2019, 04:10:07 UTC, committed by cran-robot on 09 April 2019, 04:10:07 UTC
1 parent bf07673
Tip revision: 26e049d70b4a1c237987e260cba68f6a9413736c authored by Hans W. Borchers on 09 April 2019, 04:10:07 UTC
version 2.2.5
version 2.2.5
Tip revision: 26e049d
flipdim.R
##
## Matlab flipping matrices functions
##
flipdim <- function(a, dim=1) {
if (!is.matrix(a))
stop("Argument 'a' must ba a matrix.")
if (!(dim %in% c(1,2)))
stop("Argument 'dim' must be 1 or 2 (for rows or columns).")
if (dim == 1) {
a <- a[nrow(a):1, ]
} else {
a <- a[ ,ncol(a):1]
}
return(a)
}
flipud <- function(a) {
flipdim(a, 1)
}
fliplr <- function(a) {
flipdim(a, 2)
}
rot90 <- function(a, k=1) {
if (!is.matrix(a))
stop("Argument 'a' must ba a matrix.")
if (floor(k) != ceiling(k))
k <- 0
switch(EXPR = 1 + (k %% 4),
a,
t(a[, seq(ncol(a), 1, by=-1)]),
a[seq(nrow(a), 1, by=-1), seq(ncol(a), 1, by=-1)],
{a <- t(a); a[, seq(ncol(a), 1, by=-1)]}
)
}
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