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From: Jannis
To: Greg Snow <538...@gmail.com>
Cc: r-help
Sent: Friday, June 28, 2013 4:31 AM
Subject: Re: [R] multivariate version of aggregate
Yes, I had a look at that function. From the documentation, however, it
did not get clear to me how to split the dataframe into subsets of rows
Thanks a lot to everybody who responded! My solution now looks similar
to Ruis and Davids suggestions.
Jannis
On 28.06.2013 11:00, Rui Barradas wrote:
Hello,
You can solve your problem using only base R, with no need for an
external package. The two instrucitons below are two ways of doing
Hello,
You can solve your problem using only base R, with no need for an
external package. The two instrucitons below are two ways of doing the same.
sapply(split(testframe, indices), function(x) cor(x[, 1], x[, 2]))
as.vector(by(testframe, indices, function(x) cor(x[, 1], x[, 2])))
Hope
Yes, I had a look at that function. From the documentation, however, it
did not get clear to me how to split the dataframe into subsets of rows
based on an index argument. Like:
testframe <- data.frame(a=rnorm(100), b = rnorm(100))
indices <- rep(c(1,2), each = 50)
results <- ddply(.dat
7;
Cc:
Sent: Thursday, June 27, 2013 3:22 PM
Subject: Re: [R] multivariate version of aggregate
You can pass a matrix to by()
> set.seed(42)
> dat <- data.frame(x=runif(50)*20, y=runif(50)*20,
g=rep(LETTERS[1:2], each=25))
> as.vector(by(dat[,1:2], dat$g, function(x) cor(x)
ailto:r-help-boun...@r-project.org] On Behalf Of Jannis
Sent: Thursday, June 27, 2013 12:27 PM
To: r-help
Subject: [R] multivariate version of aggregate
Dear List members,
i am seeking a multivariate version of aggregate. I want to compute,
fro
example the correlation between subsets of two vect
Look at the plyr package, probably the ddply function in that package. You
can write your own function to do whatever you want on the pieces of the
split apart object. Correlation between a specified pair of columns would
be simple.
On Thu, Jun 27, 2013 at 11:26 AM, Jannis wrote:
> Dear List
Professor of Anthropology
Texas A&M University
College Station, TX 77840-4352
-Original Message-
From: r-help-boun...@r-project.org
[mailto:r-help-boun...@r-project.org] On Behalf Of Jannis
Sent: Thursday, June 27, 2013 12:27 PM
To: r-help
Subject: [R] multivariate version of aggregate
D
Dear List members,
i am seeking a multivariate version of aggregate. I want to compute, fro
example the correlation between subsets of two vectors. In aggregate, i
can only supply one vector with indices for subsets. Is there ready
function for this or do i need to program my own?
Cheers
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