Hi.
I am using R 2.5.1 on a Windows XP machine. Here is an example of a piece
of code I was running in older versions of R on the same machine. I am
looking for underscores and replacing them with periods. This result is
from R 2.4.1:
gsub ( \\_+,\.,AAA_I)
[1] AAA.I
Here is what I get in
explaining this.
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From: Uwe Ligges [EMAIL PROTECTED]
To: Talbot Katz [EMAIL PROTECTED]
CC: r-help@stat.math.ethz.ch
Subject: Re: [R] gsub warning message
Date: Fri, 31 Aug 2007 18:04:39 +0200
Talbot Katz wrote:
Hi.
I am using R 2.5.1
in a search but the same in a replacement. I hope I have that
straight now. Thanks much!
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From: Greg Snow [EMAIL PROTECTED]
To: Talbot Katz [EMAIL PROTECTED],[EMAIL PROTECTED]
CC: r-help@stat.math.ethz.ch
Subject: RE: [R] gsub warning
Hi.
I have been trying to work with the Rdonlp2 package. There is a control
parameter called epsx that has the following description:
epsx(1e-5) - successful temination is indicated if the Kuhn-Tucker criteria
are satisfied within the value
I have tried to use the donlp2.control() function
Hi.
I recently tried the following in R 2.5.1 on Windows XP:
ev2-c(0.8,-0.6)
ev1-c(0.6,0.8)
ev1%*%ev2
[,1]
[1,] -2.664427e-17
sum(ev1*ev2)
[1] 0
(I got the same result with R 2.4.1 on a different Windows XP machine.)
I expect this issue is very familiar and probably has been
(as.numeric(xf1%*%xf2))==(sum(xf1*xf2))
[1] TRUE
Perhaps the moral of the story is that one should exercise caution and keep
track of significant digits.
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From: Charles C. Berry [EMAIL PROTECTED]
To: Talbot Katz [EMAIL PROTECTED]
CC: r-help
Hi.
I have defined a function, f1, that calls another function, f2. Inside f1
an intermediate variable called nm1 is created; it is a matrix. f2 takes a
matrix argument, and I defined f2 (schematically) as follows:
f2-function(nmArg1=nm1,...){nC-ncol(nmArg1); ... }
so that it expects nm1 as
Hi.
It seems that nearly every time I try to use factanal I get the following
response:
faa2db1-factanal(mretdb1,factors=2,method=mle,control=list(nstart=25))
Error in factanal(mretdb1, factors = 2, method = mle, control =
list(nstart = 25)) :
unable to optimize from these starting
Hi.
Suppose I have a function which does some random number generation within.
The random number generation inside the function changes the value of
.Random.seed in the calling environment. If I want to restore the
pre-function call .Random.seed, I can do:
save.seed-.Random.seed
the setRNG package, which has a specific
methodology for saving the random number generator state.
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From: Prof Brian Ripley [EMAIL PROTECTED]
To: Talbot Katz [EMAIL PROTECTED]
CC: r-help@stat.math.ethz.ch
Subject: Re: [R] Restoring .Random.seed
Date
Hi.
I'm having trouble testing for existence of an object inside a function.
Suppose I have a function:
f-function(x){
...
}
and I call it with argument y:
f(y)
I'd like to check inside the function whether argument y exists. Is this
possible, or do I have to either check outside the
a bad
programming paradigm. But even an explanation if that's the case would be
appreciated.
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From: Liaw, Andy [EMAIL PROTECTED]
To: Talbot Katz [EMAIL PROTECTED],r-help@stat.math.ethz.ch
Subject: RE: [R] Testing for existence inside a function
with this. Thanks again!
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From: Liaw, Andy [EMAIL PROTECTED]
To: Talbot Katz [EMAIL PROTECTED],r-help@stat.math.ethz.ch
Subject: RE: [R] Testing for existence inside a function
Date: Tue, 15 May 2007 11:41:17 -0400
Just need a bit more work
Hi.
I can't access the site http://wiki.r-project.org/. I didn't find any
notice about this on http://www.r-project.org/. Does anyone have any more
information about the R Wiki status? Thanks!
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join,
CONTACT: Talbot Katz, [EMAIL PROTECTED], 646.461.7840
If you don't already use R, you could (should!) start today download R
for free from the official R Project website (http://www.r-project.org/).
The R Project site contains a wealth of resources for users, including FAQ
pages, a user Wiki
Hi.
The dprep library has at least three different methods for outlier
detection: baysout, mahaout, robout.
I wanted to test them on a very simple data set:
vrmat-cbind((1:22),c(8,14,14,17,21,20,27,23,25,33,31,32,30,36,37,40,42,44,52,61,81,265))
As you can see by eyeballing this, the last
Hi.
I am trying to use the linear optimizer from package lpSolve in R 2.4.1 on
Windows XP (Version 5.1). The problem I am trying to solve has 2843
variables (2841 integer, 2 continuous) and 8524 constraints, and I have 2 Gb
of memory. After I load the input data into R, I have at most 1.5 Gb
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From: Uwe Ligges [EMAIL PROTECTED]
To: Talbot Katz [EMAIL PROTECTED]
CC: r-help@stat.math.ethz.ch
Subject: Re: [R] lpSolve space problem in R 2.4.1 on Windows XP
Date: Fri, 09 Mar 2007 17:51:30 +0100
If R is closed that way (i.e. crashes), it is a bug
Hi.
I am aware of three different R packages for linear programming: glpk,
linprog, lpSolve. From what I can tell, if there are N variables and M
constraints, all these solvers require the full NxM constraint matrix. Some
linear solvers I know of (not in R) have a sparse matrix input format.
Hi.
Here's an odd request that actually arose out of my own bad planning.
Suppose I do the following:
which(v1 %in% v2)
I will get a set of indices for v1, and they will be ordered in the same
order that v1 is in. I want the indices of the intersection for v1 ordered
according to v2.
I do
Hi.
If I have a vector, v_1, and another vector of positive integers, i_1, the
same length as v_1, then rep(v_1,i_1) will repeat v_i[j] exactly i_1[j]
times, like so:
rep(c(1,2,3),c(3,2,1))
[1] 1 1 1 2 2 3
I'd like to do the same sort of thing where I replace v_1 with a matrix, and
the jth
Brilliant, thanks!
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From: James W. MacDonald [EMAIL PROTECTED]
To: Talbot Katz [EMAIL PROTECTED]
CC: r-help@stat.math.ethz.ch
Subject: Re: [R] Efficient way to repeat rows (or columns) of a matrix?
Date: Wed, 28 Feb 2007 18:20:32 -0500
Hi
PROTECTED]
CC: [EMAIL PROTECTED], r-help@stat.math.ethz.ch, Talbot Katz
[EMAIL PROTECTED]
Subject: Re: [R] Function to assign quantiles?
Date: Fri, 16 Feb 2007 19:51:49 +1300
On 2/16/07, Frank E Harrell Jr [EMAIL PROTECTED] wrote:
Marc Schwartz wrote:
On Thu, 2007-02-15 at 17:50 -0500, Talbot Katz
Hi.
If I call the quantiles function as follows:
qvec = quantiles(dvals,probs=seq(0,1,0.1))
the results will return a vector something like the following example:
0%10%20%30% 40% 50%60%70% 80% 90%
100%
56.0 137.3 238.4 317.9 495.8
Professor Filzmoser.
Thank you so much for the detailed response. It is very helpful.
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From: Peter Filzmoser [EMAIL PROTECTED]
To: Talbot Katz [EMAIL PROTECTED]
CC: r-help@stat.math.ethz.ch
Subject: Re: Questions about results from PCAproj
Hi.
I have been looking at the PCAproj function in package pcaPP (R 2.4.1) for
robust principal components, and I'm trying to interpret the results. I
started with a data matrix of dimensions RxC (R is the number of rows /
observations, C the number of columns / variables). PCAproj returns a
Hi.
I have only recently become a regular R user, and have already benefited
from the R-help list (Thank you!). I have spent many years in the SAS world
(insert your own sassy remark here), which has its own very nice users list
site (http://listserv.uga.edu/archives/sas-l.html), plus users
Thank you so much! This is super helpful, even if it turns out that
vectorization doesn't improve performance in my situation.
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From: Charles C. Berry [EMAIL PROTECTED]
To: Talbot Katz [EMAIL PROTECTED]
CC: r-help@stat.math.ethz.ch
Subject
is an exact multiple of
the number of groups).
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From: Kaskelma, Heikki [EMAIL PROTECTED]
To: jim holtman [EMAIL PROTECTED],Talbot Katz [EMAIL PROTECTED]
CC: r-help@stat.math.ethz.ch
Subject: RE: [R] Can this loop be delooped?
Date: Fri, 2 Feb
Hi.
You folks are so clever, I thought perhaps you could help me make another
procedure more efficient.
Right now I have the following setup:
p is a vector of length m
g is a list of length n, g[[i]] is a vector whose elements are indices of p,
i.e., integers between 1 and m inclusive); the
Hi.
I have the following code in a loop. It splits a vector into subvectors of
equal size. But if the size of the original vector is not an exact multiple
of the desired subvector size, then the first few subvectors have one more
element than the last few. I know that the cut function could
Hi.
This is a real basic question about results from rlm. I want to compute the
properly scaled residual variance.
Suppose M is my rlm result object; my example regression is against two
variables, and based on 225 observations.
summary(M) tells me that
Residual standard error: 0.0009401 on
Hi.
I have a data matrix of size 3072x1910. I can compute a standard 1910x1910
covariance matrix for this, and it comes out positive definite. I wanted to
compute a robust covariance matrix with cov.nnve (in the covRobust library).
It failed with the following error message:
Error in
Hi.
I'm checking into robust methods for principal components analysis. There
seem to be several floating around. I'm currently focusing my attention on
a method of Hubert, Rousseeuw, and Vanden Branden
(http://wis.kuleuven.be/stat/Papers/robpca.pdf) mainly because I'm familiar
with other
Hi Bert.
Thank you, that sounds like an excellent idea. After my initial post, I
also found an implementation of ROBPCA in S-PLUS at
(http://wis.kuleuven.be/stat/robust/programs.html).
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From: Bert Gunter [EMAIL PROTECTED]
To: 'Talbot Katz
Hi.
I am using R 2.3.1 on WIndows XP, and I am having trouble with the rank
function in the presence of numerical NA data. I want the NA's all to get
the same rank, but they don't. Here is an example from my session:
ct_align_rets_f2$liq[6851:6859]
[1] 115396 NA 362595 NA 242986
Hi.
I am running regressions of several dependent variables using the same set
of independent variables. The independent variable values are complete, but
each dependent variable has some missing values for some observations; by
default, lm(y1~x) will carry out the regressions using only the
variables
separately with respect to missing values wasn't included. Thanks!
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From: Bert Gunter [EMAIL PROTECTED]
To: 'Talbot Katz' [EMAIL PROTECTED], r-help@stat.math.ethz.ch
Subject: RE: [R] na.action and simultaneous regressions
Date: Wed, 3
Hi.
I am using R 2.3.1 on Windows XP. I had installed a library package into my
first session and wanted the same package in my second session, so I went
out to the CRAN mirror and tried to install the package, and got the
following message:
cell
From: Uwe Ligges [EMAIL PROTECTED]
To: Talbot Katz [EMAIL PROTECTED]
CC: r-help@stat.math.ethz.ch
Subject: Re: [R] Failure loading library into second R 2.3.1 session on
Windows XP
Date: Fri, 29 Dec 2006 23:05:15 +0100
You can only expect that update / reinstall a ***package*** works
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