On Apr 23, 2010, at 1:54 PM, Ondřej Mikula wrote:
Dear R-helpers,
I need two simple functions, I guess they exist in R, but I am unable
to find them.
The first function should cyclically rotate elements in a vector.
("guyrot" in the package "wavethresh" should do it, but there's some
problem with its loading)
> rot <- function(x) (1:x %% x) +1
> rot(9)
[1] 2 3 4 5 6 7 8 9 1
> rotvec <- function(vec) vec[rot(length(vec))]
> rotvec(c(3,4,5,6,7))
[1] 4 5 6 7 3
The second function should rotate points in 2D by a given angle (about
the defined point).
That's all the homework I choose to do today.
Thanks for any advice
Ondra Mikula
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