Nothing
# $Id: combinations.R 1083 2007-03-23 22:53:00Z warnes $
#
##
## From email by Brian D Ripley <ripley@stats.ox.ac.uk> to r-help
## dated Tue, 14 Dec 1999 11:14:04 +0000 (GMT) in response to
## Alex Ahgarin <datamanagement@email.com>. Original version was
## named "subsets" and was Written by Bill Venables.
##
combinations <- function(n, r, v = 1:n, set = TRUE, repeats.allowed=FALSE)
{
if(mode(n) != "numeric" || length(n) != 1
|| n < 1 || (n %% 1) != 0) stop("bad value of n")
if(mode(r) != "numeric" || length(r) != 1
|| r < 1 || (r %% 1) != 0) stop("bad value of r")
if(!is.atomic(v) || length(v) < n)
stop("v is either non-atomic or too short")
if( (r > n) & repeats.allowed==FALSE)
stop("r > n and repeats.allowed=FALSE")
if(set) {
v <- unique(sort(v))
if (length(v) < n) stop("too few different elements")
}
v0 <- vector(mode(v), 0)
## Inner workhorse
if(repeats.allowed)
sub <- function(n, r, v)
{
if(r == 0) v0 else
if(r == 1) matrix(v, n, 1) else
if(n == 1) matrix(v, 1, r) else
rbind( cbind(v[1], Recall(n, r-1, v)),
Recall(n-1, r, v[-1]))
}
else
sub <- function(n, r, v)
{
if(r == 0) v0 else
if(r == 1) matrix(v, n, 1) else
if(r == n) matrix(v, 1, n) else
rbind(cbind(v[1], Recall(n-1, r-1, v[-1])),
Recall(n-1, r, v[-1]))
}
sub(n, r, v[1:n])
}
##
## Original version by Bill Venables and cited by by Matthew
## Wiener (mcw@ln.nimh.nih.gov) in an email to R-help dated
## Tue, 14 Dec 1999 09:11:32 -0500 (EST) in response to
## Alex Ahgarin <datamanagement@email.com>
##
##
#permutations <- function(n, r, v = 1:n, set = TRUE, repeats.allowed=FALSE)
#{
# if(mode(n) != "numeric" || length(n) != 1
# || n < 1 || (n %% 1) != 0) stop("bad value of n")
# if(mode(r) != "numeric" || length(r) != 1
# || r < 1 || (r %% 1) != 0) stop("bad value of r")
# if(!is.atomic(v) || length(v) < n)
# stop("v is either non-atomic or too short")
# if( (r > n) & repeats.allowed==FALSE)
# stop("r > n and repeats.allowed=FALSE")
# if(set) {
# v <- unique(sort(v))
# if (length(v) < n) stop("too few different elements")
# }
# v0 <- vector(mode(v), 0)
# ## Inner workhorse
# if(repeats.allowed)
# sub <- function(n, r, v)
# {
# if(r==1) matrix(v,n,1) else
# if(n==1) matrix(v,1,r) else
# {
# inner <- Recall(n, r-1, v)
# cbind( rep( v, rep(nrow(inner),n) ),
# matrix( t(inner), ncol=ncol(inner), nrow=nrow(inner) * n ,
# byrow=TRUE )
# )
# }
# }
# else
# sub <- function(n, r, v)
# {
# if(r==1) matrix(v,n,1) else
# if(n==1) matrix(v,1,r) else
# {
# X <- NULL
# for(i in 1:n)
# X <- rbind( X, cbind( v[i], Recall(n-1, r - 1, v[-i])))
# X
# }
# }
# sub(n, r, v[1:n])
#}
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.