similar to: Column of numbers added to dataframe when saving with read.csv

Hello, the more general thing I'd like to learn here is how to compute Function of Data on the basis of grouping determiend by n variables. In terms of the reason why I am interested in this, I need to compute the average of my data based on the value of the month and day across years. I have come up withy the code below which, as far as I can see, does what I need but getting either a more

Hi, I try to create PDF files with an modified script from Buchan Milne and have some problems with the Jobname var %J. Because it is better for the users to find an file with an similar name as the original document I'm looking for a way to read out %J, cut some unnessasary stuff and use the rest as new file name. The problem is: In %J in some circumstances is not the complete Jobname as

Hello! I'm having a problem with Samba 3.0.3 on a HP-UX 11.00 server. In Samba, I'm having a printer which allows me to create PDF files. For this, I added the following lines to smb.conf: [global] load printers = No printcap name = /etc/opt/samba/printcap [printers] comment = Defaults for all printers path = /var/opt/samba/spool read only = Yes

Hello! First time posting here: Here is my code: x <- c(1:22) finaloutput=cidrm=NULL finaldiversityoutput=diversitym=NULL diversityinfo=read.table("Diversity_info.txt", header=T, sep="\t", row.names=NULL) attach(diversityinfo) diversitynr=nrow(diversityinfo) diversitytemp <- matrix(0,nrow=diversitynr,ncol=1) for(j in 1:length(x)) {

Hello, I have a set of one-liners (many thanks to previous responses from this list) that I use to look at newly imported data sets with functions like dim(), names(), str(), etc. within lapply(). Generally, these commands work for me but, I am apparently still missing some aspect of list manipulation. I don't understand why I get a set of NULL list elements at the end of each output as