[R] Working directories... Again

Dear R forum, I've looked many places for this and figure there must be an easy way to implement. I want to set the working directory in my script to the place where the R code is located. Something like: setwd(directory where this script is found). Thanks! -Allen -- View this message in

[R] Lyapunov matrix equation

Dear R forumers, Wondering if anyone knows of a package that can solve the lyapunov matrix equation C=ACA^T + B in R? Currently I am exporting to Mathematica, solving and bringing the results back in, but this is not ideal. Can R do this? Thanks in advance, Allen -- View this message in context:

[R] Class attributes

Dear R forum, I want to replace all the elements in a data frame (dd) which match the character x with 0. What's the most elegant way of doing this (there must be an easy way which I've missed)? I settled on the following loop: for(i in 5:12){# These are the column of dd I am