Unable to reload Rdoc

Related: To simplify reloading a help page after restarting R, I do
have the following in my ~/.Rprofile:

# Always only the HTML help on the same port
local({
 port <- sum(c(1e3,10)*as.double(R.Version()[c("major", "minor")]));
 ports <- 10*port + 0:9;
 options(help.ports=ports);
});

# Try to start HTML help server
tryCatch({
 if (interactive()) {
   tools::startDynamicHelp();
 }
}, error = function(ex) {
 print(ex);
})

That way the URL for the help page remain the same (as long as you
only run one R session) and the internal web server is up and running
(no need for help.start()).

My $.02

/Henrik

On Fri, Jan 27, 2012 at 6:15 AM, Hadley Wickham <hadley at rice.edu> wrote:

On Fri, Jan 27, 2012 at 3:47 AM, Mark Cowley <m.cowley at garvan.org.au> wrote:

Dear list,
I'm hoping the R guru's can help with an error i've been getting for at least a year during active package development.

I have a package loaded & spot a documentation bug, so I:
edit the Rd file (or in the roxygen header + roxygenize); then
R CMD BUILD,
R CMD INSTALL
then in the same R session, reload the library & lookup a man page, I always get this error:
Error in fetch(key) : internal error -3 in R_decompress1

I've tried all ways of reloading the package that i'm aware of:
detach then library
unloadNamespace then library
devtools::install
devtools::reload

all lead to the error.

I see from ?detach:
... So detaching and re-attaching a package may
not refresh some or all components of the package, and is
inadvisable.

restarting the R session results in loading the updated man file, but do you have any ideas how to word around this & continue within the same R session?

cheers,
Mark

# 1) using Hadley's devtools

library(devtools)
library(updateR) # my package under development
install("~/src/R/updateR")

To avoid this problem, the latest version of devtools has show_rd(),
which allows you to preview an Rd file in R without having to
reinstall the package.  This was actually really simple to implement,
and I don't know why I didn't think of it ages ago - it's certainly
made my workflow much smoother.

Hadley

--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/