Saving Rdata files in a zip archive form can in some cases save a
considerable amount of disk space. R has the zip.file.extract function to
extract files from zip archives, but appears not to have any corresponding
function to save in zipped form. (At least I have not been able to find
anything in
R users in Oregon,
Please contact me if you would like to participate in an R users group. At
our agency, we use R extensively for transportation model development,
implementation and analysis. We would like to meet periodically with other R
users in various professions to exchange ideas on using
I had this problem too. The documentation for the winMenus says that these
functions are part of the utils package. R must be loading this library
after it sources in Rprofile. If you add library(utils) to the beginning of
your .First function, it should take care of the problem.
Brian Gregor, P.E
First, here's the problem I'm working on so you understand the context. I
have a data frame of travel activity characteristics with 70,000+ records.
These activities are identified by unique chain numbers. (Activities are
part of trip chains.) There are 17,500 chains.
I use the chain numbers as f
You might check out a short email course that Ben Stabler and I developed
for transportation modelers in Oregon. It's on our web site.
http://www.odot.state.or.us/tddtpau/r/rbook.pdf
Brian Gregor, P.E.
Transportation Planning Analysis Unit
Oregon Department of Transportation
[EMAIL PROTECTED]
(503
It seems to me that the simplest approach is as follows. Say you have a
function as follows:
dosomething <- function(x,y) 0.523*x^2 + 0.34*y
Then you just use apply as follows to get your result (assuming that the
first column of matrix m contains the x values and the second column
contains the y v
I have what is likely to be a simple question about the else keyword.
The usage in the help pages is as follows:
if(cond) cons.expr else alt.expr
I would expect to be able to use it in the following way as well:
if(cond){
cons.expr
}
else alt.ex
