similar to: extracting characters from a string

Dear all, I have a dataframe of names (netw), with each cell including last name and initials of an author; some cells have NA. I would like to extract only the last name from each cell; this new dataframe is calle 'res' Here is what I do: res <- data.frame(matrix(NA, nrow=dim(netw)[1], ncol=dim(netw)[2])) for (i in 1:x) { wh <- regexpr('[a-z]{3,}',

Dear all, I am working on an author network and to do so I have to arrange a data.frame (tutu) crossing author names (rows) per publication number (column). The participation of the author to a study is indicated by a 1 and 0 otherwise. I have a vector (xaulist) of all the names of authors and a data.frame (tata) with all the publications in row and the authors in columns. I have writen a loop

well, I had the site and page and I had added the relevant backport but it didn't work and i keep installing R 2.7 . Don't know why; i probably missed something. #### May be you should add in your mail the file : /etc/apt/sources.list (I suppose there might be a typo, as IT addresses are long and booring, and AFAIK, correcting a typo one made is **very** difficult). FYI binary installs

Dear all,   i would like to count the number of times where I have combined occurrences of the categories of 2 variables.   For instance, in the dataframe below, i would like to know how many times each author (au1, au2, au3 represent the first, second, third author) is associated with each of the category of the variable 'nam'. The position of the author does not matter.   nam <-

Dear R help list, I am modeling some survival data with coxph and survreg (dist='weibull') using package survival. I have 2 problems: 1) I do not understand how to interpret the regression coefficients in the survreg output and it is not clear, for me, from ?survreg.objects how to. Here is an example of the codes that points out my problem: - data is stc1 - the factor is dichotomous

Thanks for sharing the questions and responses! Is it possible to appreciate how much the coefficients matter in one or the other model? Say, using Biau's example, using coxph, as.factor(grade2 == "high")TRUE gives hazard ratio 1.27 (rounded). As clinician I can grasp this HR as 27% relative increase. I can relate with other published results. With survreg the Weibull model gives a

I do not mean to be argumentative, but I have to admit a little frustration with Gluster. I know an enormous emount of effort has gone into this product, and I just can't believe that with all the effort behind it and so many people using it, it could be so fragile. So here goes. Perhaps someone here can point to the error of my ways. I really want this to work because it would be ideal

I have a laptop and desktop that have most of home directory data sync'd, but I am having trouble keeping symlinks straight. On the desktop, my data is separate from the $HOME folder... $HOME = /remote/home/desktop/ and the data is at /data/. Within /data/, I have several directories that are inter-related... eg, /data/pub1/figs is a link pointing to /data/imgs/pub1. It makes life easier

I have a gentoo 2.6.14 box with 4 nics, LAN/DMZ/PUB1/PUB2 LAN and DMZ have a 1918 /22 each, PUB1 and PUB2 have a /29 each of which 5 ips are assigned. Using the mangle table, I give all packets a mark (according to local policies) in the range 1-10. Using ip rule, i pass marks 1-5 through the pub1 route table, and marks 6-10 through the pub2 routing table. Using the nat table, I SNAT to one

Hello, I am modeling some survival data wih cph (Design). I have modeled a predictor which showed non linear effect with restricted cubic splines. I would like to retrieve the se(coef) for other, linear, predictors. This is just to make nice LateX tables automatically. I have the coefficients with coef(). How do I do that? Thanks, David Biau. [[alternative HTML version deleted]]

Dear all, i have re-installed Debian on my computer and for some reason I cannot install some packages anymore using the install.package command from the R console. Some packages I can, and some I cannot (Design for instance) this is what I get: > install.packages('Design') Installing package(s) into ‘/usr/local/lib/R/site-library’ (as ‘lib’ is unspecified) --- Please select a CRAN

Dear Help List, I am trying to install a package (DiagnosisMed) on R (R version 2.10.1 (2009-12-14)) on Debian Lenny (architecture i386). I get the following error message: ~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~ * installing *source* package ‘DiagnosisMed’ ... ** R ** data ** preparing package for lazy loading Error in firstlib(which.lib.loc, package) : Tcl/Tk support is not available on this

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I have a configuration where RTP traffic is going out interface pub0, and coming back into through pub1. I have bindaddr=0.0.0.0 in sip.conf, and a netstat -an shows: udp 0 788 0.0.0.0:5060 0.0.0.0:* which means that Asterisk is listening on all addresses (on all interfaces?). Anyway, when the RTP traffic comes back in on interface pub0, Asterisk does nothing with it. A

This is a list of issues for discussion for CentOS-4. Most of it is based on my experience from building/maintaining CentOS-2 and observing CentOS-3. I have not seen the CentOS-4 beta yet so I don't know if any of this is already done. If these have been discussed on IRC then perhaps someone could produce a shot summary of the outcomes....? * Just call it CentOS-4 not 4.1 etc. Too

Hello, I would like, if it is possible, to compare the effect of a variable across regression models. I have looked around but I haven't found anything. Maybe someone could help? Here is the problem: I am studying the effect of a variable (age) on an outcome (local recurrence: lr). I have built 3 models: - model 1: lr ~ age y = \beta_(a1).age - model 2: lr ~ age + presentation

I tried the following comm in Linux(Ubuntu), It works well: >set.seed(43);runif(3):rnorm(3) >set.seed(43);runif(3);rnorm(3) At 2011-03-26 19:00:05£¬r-sig-debian-request@r-project.org wrote: >Send R-SIG-Debian mailing list submissions to > r-sig-debian@r-project.org > >To subscribe or unsubscribe via the World Wide Web, visit >

Hi all, has anyone tried and possibly succeeded in installing "reshape" package on Debian Lenny? I have a permanent failure because i cannot find the "plyr" package. I tried 10 mirrors. I contacted Hadley Wickham and James Long who seemed to have been closed to do it but it didn't work (meaning so far I haven't the answer from them). So has anyone any ideas as how to

Hi all, how do you update R on Debian lenny? I have tried to re-install r-base after adding deb http://<favorite-cran-mirror>/bin/linux/debian lenny-cran/ to my backport lists but it keeps installing R 2.7.1. What should I be doing to get the lattest R release? I need it to install a package (plyr) Thanks, David. [[alternative HTML version deleted]]

If you need a newer version of R for installing the latest version of plyr, perhaps another solution (as very new versions of R -2-11.0- will come out soonly ) , which needs 2 lines of bash!, might be to download an old version of plyr : wget \ http://cran.at.r-project.org/src/contrib/Archive/plyr/plyr_0.1.1.tar.gz and install it R CMD INSTALL plyr_0.1.1.tar.gz (and then reshape