If I were Michael (OP) right now, I think my head would be spinning.
As a newbie myself, I know how hard it is to read R code for the first
time, so could it also be part of the newsgroup etiquette to at least
partially explain provided code to newbies?
I agree that the interactive help '?' is available and should be
consulted, but it would also be helpful if those of you with great
experience could add a little guidance for your code.
Excuse me if this is out-of-place.
Ben
On 11/09/13 09:48, Ben Bolker wrote:
On 13-09-10 06:24 PM, arun wrote:
Hi,
May be this also works:
dist(x)
# 1 2 3
#2 2
#3 6 4
#4 12 10 6
as.matrix(dist(x))
# 1 2 3 4
#1 0 2 6 12
#2 2 0 4 10
#3 6 4 0 6
#4 12 10 6 0
which(dist(x)==min(dist(x)))
#[1] 1
A.K.
Yes, but you need to set the diagonal to NA, or something -- the OP
doesn't want to include self-comparison. It also helps to use
arr.ind=TRUE in which(). You're right that dist() would be a hair more
efficient that outer(...), though
----- Original Message -----
From: Ben Bolker <bbol...@gmail.com>
To: r-h...@stat.math.ethz.ch
Cc:
Sent: Tuesday, September 10, 2013 5:39 PM
Subject: Re: [R] Subtracting elements of a vector from each other stepwise
arun <smartpink111 <at> yahoo.com> writes:
Hi,
Not sure this is what you wanted:
sapply(seq_along(x), function(i) {x1<- x[i]; x2<- x[-i];
x3<-x2[which.min(abs(x1-x2))];c(x1,x3)})
# [,1] [,2] [,3] [,4]
#[1,] 17 19 23 29
#[2,] 19 17 19 23
A.K.
It's a little inefficient (because it constructs
the distances in both directions), but how about:
x = c(17,19,23,29)
d <- abs(outer(x,x,"-"))
diag(d) <- NA
d[lower.tri(d)] <- NA
which(d==min(d,na.rm=TRUE),arr.ind=TRUE)
?
----- Original Message -----
From: Michael Budnick <mbudnick08 <at> snet.net>
To: r-help <at> r-project.org
Cc:
Sent: Tuesday, September 10, 2013 4:06 PM
Subject: [R] Subtracting elements of a vector from each other stepwise
I am trying to figure out how to create a loop that will take the
difference of each member of a vector from each other and also spit out
which one has the least difference.
I do not want the vector member to subtract from itself or it must be able
to disregard the 0 obtained from subtracting from itself.
For example:
x = c(17,19,23,29)
[snip]
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