Hi All,
I am trying to create an index that returns something like
1,2,1,2,3,4,3,4,5,6,5,6,7,8,7,8
and so on and so forth until a predetermined value (which is obviously even).
I am trying very hard to avoid for loops or for loops front ends.
I'd be obliged if anybody could offer a
Hi. Here are two approaches:
c(mapply(function(x,y) rep(c(x,y), 2), (1:10)[c(T,F)], (1:10)[c(F,T)]))
c(tapply(1:10, rep(1:(10/2), each=2), rep, 2), recursive=T)
Andrija
On Mon, Nov 11, 2013 at 1:11 PM, Federico Calboli
f.calb...@imperial.ac.ukwrote:
Hi All,
I am trying to create an
Hi,
first off, thanks for the suggestion. I managed to solve it by doing:
IND = rep(c(T,T,F,F), 5)
X = rep(NA, 20)
X[IND] = 1:10
X[!IND] = 1:10
which avoids any function -- I think mapply, apply etc call a for loop
internally, which I'd rather avoid.
BW
F
On 11 Nov 2013, at 12:35,
f1
function(x) {
one - matrix(1:x, nrow=2)
as.vector(rbind(one, one))
}
environment: 0x0daaf1c0
f1(8)
[1] 1 2 1 2 3 4 3 4 5 6 5 6 7 8 7 8
Pat
On 11/11/2013 12:11, Federico Calboli wrote:
Hi All,
I am trying to create an index that returns something like
Here's a rather extreme solution:
foo-rep(1:6,each=2)
Rgames foo
[1] 1 1 2 2 3 3 4 4 5 5 6 6
Rgames foo[rep(c(1,3,2,4),3)+rep(c(0,4,8),each=4)]
[1] 1 2 1 2 3 4 3 4 5 6 5 6
In the general case, then, it would be something like
foo- rep(1:N, each = 2) # foo is of length(2*N)
Here is another solution that is a bit more flexible
tmp - seq(8)
# split into your desired groups
max.groups - 2
tmp.g - split(tmp, ceiling(seq_along(tmp)/max.groups))
# do repeats, unlist, numeric index
as.numeric(unlist(rep(tmp.g, each = 2)))
Hope this works for you,
Charles
On Mon, Nov
n-7
rep(seq(1,n,2), each=4)+c(0,1,0,1)
[1] 1 2 1 2 3 4 3 4 5 6 5 6 7 8 7 8
rep(), seq(), rbind(), apply() ... whatever: internally there will always
be iteration via some loop :-)
Ia.
On Mon, Nov 11, 2013 at 11:16 AM, Carl Witthoft c...@witthoft.com wrote:
Here's a rather extreme
Spotfire, TIBCO Software
wdunlap tibco.com
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf
Of Iakub Henschen
Sent: Monday, November 11, 2013 8:42 AM
To: r-help@r-project.org
Subject: Re: [R] repeating values in an index two by two
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