similar to: how to create three new variables? Thanks a lot!

e.g. a= a b c d e 1 1 1 3 1 1 2 1 2 3 4 5 3 1 3 3 8 3 4 1 4 3 3 5 5 1 1 3 1 1 I want to delete colume a and colume c, because they have the same values in every row, then ,I want to get this data.frame . b= b d e 1 1 1 1 2 2 4 5 3 3 8 3 4 4 3 5 5 1 1 1 the following is my code but it's wrong. rm(list=ls()) a=c(1,1,1,1,1); b=c(1,2,3,4,1); c=c(3,3,3,3,3);

Dear All, I'm trying to model heteroscedasticity using a multilevel model. To do so, I make use of the nlme package and the weigths-parameter. Let's say that I hypothesize that the exam score of students (normexam) is influenced by their score on a standardized LR test (standLRT). Students are of course nested in "schools". These variables are contained in the

Sorry, this is my first time to post. I have a big data set: first colume is date (ex: 2008-2-150, the second is time (10:30:00), and the following columes are variaty measurement data. Every 30 min, I have one data. I want to find an effecient way to calculate the hourly, daily, monthly and yearly average, and plot them, and eventually use these average data to do further analysis. Thanks!

my programe is below: a=c(1,2,1,1,1); b=c(1,2,3,4,1); c=c(3,4,3,3,3); d=c(1,2,3,5,1); e=c(1,5,3,5,1) data.f=data.frame(a,b,c,d,e) origin.data<-data.f cor.matrix<-cor(origin.data) origin.cor<-cor.matrix m<-0 for(i in 1:(cor.matrix[1]-1)) { for(j in (i+1):(cor.matrix[2])) { if (cor.matrix[i,j]>=0.95) { data.f<-data.f[,-i]; i<-i+1 }

Hi everyone, I'm testing with a Samba4 AD network, and I have some problems with DNS on the second DC, with which I could use a bit of your help. I have an AD with two DC's, both Samba 4.2.3. On the first DC, samba_dnsupdate works fine. With stock 4.2.3 I get the error "TSIG error with server: tsig verify failure" but the DNS updates succeed anyway, and after applying

L.P.H. van Belle writes: > check the rights on : > /var/lib/samba/private/dns.keytab 640 root:bind > /var/lib/samba/private/dns 750 root:bind > /var/lib/samba/private/sam.ldb.d 750 root:bind I'm using the internal DNS on both DC's, so I guess bind access rights aren't the issue. Thanks for your answer though :) Regards, Roel > >-----Oorspronkelijk

L.P.H. van Belle writes: > is the time in sync on your servers ? Yes it is. I managed to make it work by specifying the primary DC as nameserver in /etc/resolv.conf of the secondary DC. As soon as I do that, samba_dnsupdate works on the secondary. When I change it back to use the local Samba as resolver, it no longer works. So it is a DNS issue (possibly related to replication

I realize this is a CentOS mailing list but because it is based directly on RHEL, I would assume there are a few individuals who frequent the list that have passed the RHCE exam. I plan on taking the exam this March and was wondering if there are any tips you RHCEs out there could provide that may help me. Thanks! Dan -------------- next part -------------- An HTML attachment was scrubbed...

Hi all, will anyone please share me some material on RHCE/RHCT, I am fighting for the Quality Engineer in RedHat, and that may help a lot in the coming written exam. Many thanks and Merry Christmas! Cheers, Xiaobo -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20081224/57086264/attachment-0003.html>

Dear CentOS users, is it possible to prepare for a certified (big North American Linux vendor) engineer exam with a CentOS install ? I have heard that the test contains questions on specific GUIs, are they included in the CentOS distribution? - Gergely

Hello, I import datas from an file with: readLines But I need only a part of all measurments of this file. These are between two borders "START" and "END". Can you tell me the syntax of grep(), to choose values between two borders? My R Code was not succesful, and I can't finde anything in the help. Thank's a lot. Felix ######### R-CODE ################### file

Subject really says it all. I took the practice exam linked from @PuppetLabs and I was a little bit surprised/caught-off-guard by the number of either PE or Console questions, neither of which I''ve ever used :-! I am taking the developer exam though, so I''m sure that will be at least a little different. Does it make sense to take the exam for an "open source puppet

Hi folks, Is there anywhere I can possibly get a model of the exam itself, maybe possible scenarios for the prac, etc? To people who have done the exam....any helpful hints ? Thanks,

Hello. To someone who have done the dCAP exam. I would like to know about it: test and practises questions examples, difficulty level,... I'll be very grateful if somebody sends me an exam model. Thanks in advance

Hi there. I have a final exam coming up in a class that is heavily based in the R programming language. The teacher has provided to us a few questions to study in preparation for the exam. I was looking to see if anyone could help answer any or all of these questions. Your help is extremely appreciated! Thank you! - Spark 1. Write the first 6 lines of a hypothetical external data file named

Hi, I am studying for the RHCSA Exam and wanted to install CentOS 6.4 alongside Windows 8. I got a new laptop with a processor that supports virtualization. I am planning to remove all the recovery partitions after backing up all drivers etc. on them. Lets see how it works out. Any caveats I should know about? Regards adj

Dear R-list, the following code had been running well over the last months: exam <- matrix(rnorm(100,0,1), 10, 10) gg <- factor(c(rep("A", 5), rep("B", 5))) mlmfit <- lm(exam ~ 1); mlmfitG <- lm(exam ~ gg) result <- anova(mlmfitG, mlmfit, X=~0, M=~1) Until, all of a sudden the following error occured: Fehler in

Hi, emails to astricon.net seems to bounce (at least for me) I need information about proper & authorized Asterisk training in the Miami, FL area and the possibility of later DCAP testing. Thanks, -- ------------------------------------------- Erick Perez Linux User 376588 http://counter.li.org/ (Get counted!!!) Panama, Republic of Panama

Hello, I have a problem with readLines. I have a data file with many informations added with a different number of measurments (example at the end). I only want to read the measurments witch start with "START OF HEIGHT DATA" and end with "END OF HEIGHT DATA". The difficulty is: -I want to read the file with "readLines", because the measurments have letters and

hi all, i have centos 5 w/o gui. i can only have access via ssh. i have a text file that contains special (unprintable) characters, what editor i can use to exam what those character are??? i use vi, but i don't know what is ^@ may be an editor that can show ASCII as dec or hex. thanks