search for: bielefelde

Dear R users, just a quick question: Is there a reliable and good graph library for R, eg. with shortest path algorithms on adjacency matrixes? I already found a graph package as part of "Bioconductor". Are there more? If anyone knows and would tell me, I appreciate very much! Cheers, Andre -- Dipl.-Inform. Andre Skusa (PhD student) NRW Graduate School in Bioinformatics and

Hi, I've encountered a strange problem while using FreeBSD 6.0 for our local mirror (mirror.math.uni-bielefeld.de) and thus is providing access via ftp, http, rsync and cvsup (all local and remote). The system crashes periodically with a kernel panic (panic: sbdrop). The uptimes between two crashes are going from a few hours to a few weeks. The system is a i386, Intel Pentium 4 based with

Hi! I want o calc the norm of a complex number ( |c| where c is complex). Does the function abs() this ? Thanks, -- Frank G. Zoellner AG Angewandte Informatik Technische Fakult"at Universit"at Bielefeld phone: +49(0)521-106-2951 fax: +49(0)521-106-2992 email: fzoellne at techfak.uni-bielefeld.de

We recently had a strange NFS performance anomaly between a V880 running snv_124 and two NetApp filers. To investigate, a DTrace NFSv4 (and eventually NFSv3) client provider would been extremely helpful. Unfortunately, all I could find were a request for code review of a v3 client provider and another request for help developing a v4 provider. Nothing seems to have come from those initiatives,

I would like to do some fairly basic stem-and-leaf displays in R. I am aware (I might even say painfully aware) of stem(base) and have tried it. That's why I'm hoping someone has a usable stem- and-leaf display for R so that I don't have to write my own. r-project.org > Search > R Site Search > "stem and leaf display" finds nothing. I also tried the mail archive

Hi! I am using R 1.8.1 and the svm of the e1071 package for classification. The problem is that I have unbalanced classes e.g. the first one is much bigger than the second one and therfore the svm is biased to the first class. If I manually adjust the class size the bias disappears. The question is then how to include this unequal class distribution to the svm (e.g. via wheights or costs)?

Running dovecot 1.2.9 on a Ubuntu 10.04.1 LTS virtual machine. Postfix receives messages and hands them over to deliver for local storage. Today two mails came in that could not be found allthough they got delivered. What catches my eye is the "?" in the msgid: Jan 5 21:10:47 mail dovecot: deliver(consulting): msgid=? <14847_1294258245_ZZh0g1h9eLfxL.00_fc2fe6e910f03.4d24de54 at

Hi! I am using the fft() function the base package to transform some 1d signal. If I use this standar fucntion I get a very huge first fourier coeficient. I think this dues to the handling of the borders of the signal. Usually in fft especially in image processing the signal is simulated to be continuous by adding the signal several times periodically. My question is, is there some function

 Dear Madame or Sir,I am having a problem in combining density-smoothed scatterplot matrices with a plot of kernel destiny estimations of each dimension plotted on the respective field of the diagonal.I have tried following approach using the package "sm" for the kernel density estimation, as well as "MASS" respectively:pairs(myTable[, 1:4],panel=function(x,y, ...){

It seems that the standardized deviance residulas, that one gets on plots of a glm.object x with plot(x) are calculated as r <- residuals(x) s <- sqrt(deviance(x)/df.residual(x)) w <- weights(x) hii <- lm.influence(x)$hat r.w <- if (is.null(w)) r else (sqrt(w) * r) rs <- r.w/(s * sqrt(1 - hii)) This implies that, for example, for binomial B(ni,pi) data the devaince residials

Hello! We are a group of three students at Bielefeld University currently working on a statistical projects about neural networks. Within the framework of this project we are supposed to use the nnet-function in R and explain how it works. Since anyone of us has much experience in using R we hoped to find some information on your homepage. Unfortunatelly, we haven't been very successfull so

I've searched the doc for insert and could not find the way to do the following, hope someone can help: Let's say we have a vector: > a [1] "1" "2" "3" "5" "6" "3" and we want to insert a "7" after any given "3", i.e., we want vector a to become: [1] "1" "2" "3"

Hallo Tk experts, the Tcl/Tk package allows to define very nice widgets for starting R functions, for printing results and for interactive parameter input. tkdensity.R and tkttest.R demonstrate this and both demos explain how some of the tk functions can be used. For constructing new widgets I would like to see further examples showing Tcl/Tk package in action. Therefore my question: Is there a

Hi, we've upgraded recently from samba 3.0.23 to 3.0.25b. Since then, we've getting these error messages from winbindd: Jul 17 12:00:23 cvk027 winbindd[20772]: [2007/07/17 12:00:23, 0] lib/util_str.c:safe_strcpy_fn(659) The volume of these messages is very high, many times together with unreadable character garbage. Is there any way to correct or suppress these messages? Our

Prasad wrote: > I wrote a function in R which uses tcltk package .... essentially I wanted > to give within that function, a widget with 2 radiobuttons to choose > between plotting Precip and Temperature plots. After the user has chosen > one of the radiobuttons there is another widget that asking him to identify > outliers. However, I am having a lot of problems...what R does is

Hi everybody, I am using btrfs as my main fs for some time now, but I am experiencing severe performance drawbacks. I can''t qualify the circumstances, but sometimes during disc access the whole system freezes for some time. Maybe somebody could suggest some general things I could try to search for the problem? Thanks in advance, Florian --- Some background information: $ mount |

I have found XLispStat's spinning plots illuminating. I'd like to do the same thing in R. A dozen or so probes with help, help.search, apropos haven't turned up anything, and I've even resorted to grepping through the entire R source distribution looking for 'spin.*plot', to no avail. Either the feature is called something else in R (what?), or it's in some other

Sorry, for my mail from last night contains no subject. Therefore, I send it again and two tcltk questions are appended. ---------------------------------------------------------------------------- Prasad wrote: > I wrote a function in R which uses tcltk package .... essentially I wanted > to give within that function, a widget with 2 radiobuttons to choose > between plotting Precip

Hello, I've got a question concerning the usage of robust standard errors in regression using lm() and exporting the summaries to LaTeX using the memisc-packages function mtable(): Is there any possibility to use robust errors which are obtained by vcovHC() when generating the LateX-output by mtable()? I tried to manipulate the lm-object by appending the "new" covariance

Hi, I've got a matrix of two columns, say: > d <- t(array(1:20,dim=c(2,10))) > d [,1] [,2] [1,] 1 2 [2,] 3 4 [3,] 5 6 [4,] 7 8 [5,] 9 10 [6,] 11 12 [7,] 13 14 [8,] 15 16 [9,] 17 18 [10,] 19 20 now I need those values from column #2 where column #1 is equal to certain values. eg.: > i <- c(13,5,19) The