sed -i 's/[^,]*,//' file.csv

Note the [^,]* bit, which matches everything that is not a comma. Don’t use .*, because this will greedily match commas, too. (Usually, cut is useful for these sort of things, but cut cannot readily replace the file in place.)

gconf-editor

and change the setting desktop → gnome → interface → gtk_key_theme from “Default” to “Emacs”.

If you show us your data/code/output as has been requested, then we may be able to tell which it is. Without that information you are expecting either R or the members of the list to read your mind. I keep making notes to my future self to use the timetravel package (not written yet, that’s why I need my future self to use it) to send a copy of the esp package (also not written yet) back in time to me so I can use it for situations like this. But so far that has not worked (maybe my future self is even more lazy than my present self, or my near future self does something to offend my far future self enough that he is unwilling to do this small favor for my current past self, darn, either way means I should probably do better on the diet/exercise).

Time for lunch.

[client]
password='mypassword'

This gets loaded in addition to the system configuration file, which for me is at /etc/mysql/my.cnf.

sudo aptitude install r-cran-rmysql

because when I used

install.packages("RMySQL")

it asked my to specify the MySQL libraries and headers and whatnot and don’t know where they are.

x <- rep(1:3,5)

You have to then type x to see it:

> x
 [1] 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3

You can exploit this fact for doing a quick-and-dirty lottery. Assume you have a file with email addresses, one per line, called "entries.txt". First, read them and assign them to an object:

entries <- readLines("entries.txt")

Next, create an index of numbers of the same length but in random order:

index <- sample(1:length(entries),length(entries))

Note that you don't see it unless you type index. Combine index and emails in a dataframe (also not directly visible):

dat <- data.frame(cbind(index,entries))

Now, go to random.org and draw a number from the index. Type dat to reveal who you drew. This method makes it a bit more "blind" and a bit less likely that you'll cheat.

Paragraph ended before \Hy@setref@link was complete

This was due to having a regulare closing parenthesis directly after the curly bracket that closed a \ref, like this: (see section \ref{section-1}). Putting in a space between the closing curly bracket and parenthesis solved the problem: ... section-1} )

test <- c('p','p','t','t','t','p','k','t')
v <- cumsum(ind <- test == 't')
v[!ind] <- NA

I didn't know you could assign something to an object and use it at the same time. Very neat. So if you wanted this all at once, you could also do:

v <- ifelse(cumsum(ind <- test=='t')==0,NA,cumsum(ind))

or

ifelse((v <- cumsum(test=='t'))==0,NA,v)

Maybe Dimitris' solution is in fact preferred for R, using indexing instead of if/ else, but I don't know enough about R to know whether that makes a difference.