31st
tip: latex
a number of useful listings settings for inline code snippets http://bit.ly/Ai4fnu
a number of useful listings settings for inline code snippets http://bit.ly/Ai4fnu
use geom_line(aes(group=1)) to connect x-axis factors via a line with ggplot2 (h/t @hadleywickham)
a handy syntax reference for specifying statistical models in R: http://bit.ly/yza8SK
hide part of a legend in ggplot2 with legend=F in the scale, e.g. scale_size(legend=F)
(ab)use ggplot2 to connect x-axis factors via a line with geom_line(aes(x=as.integer(x), y=…))
use jot as an alternative to seq for generating sequential and random numbers http://macw.us/pdfadN
check if a variable is numeric in awk func isnum(x) {return x==x+0} http://bit.ly/pTDTXW
swap left alt and command keys with setxkbmap -option altwin:swap_lalt_lwin http://bit.ly/pNSwYN
current date & time w/ boost::posix_time: to_extended_iso_string(second_clock::local_time()); http://bit.ly/qPTclz
use disown to detach a process from a shell http://bit.ly/ojUN7u (h/t @mihasya)