On Mon, 2006-10-30 at 10:37 -0800, waverley palo wrote:
Hi,
I am new in R and have some frustrations as how to set debug breaks during
emacs R debug. I use debug () as where or which function to debug. But
during the debug, e.g., I have a for loop at the beginning of the function
code and want the code execution to jump through that for loop and set a
break after that. How to do that? Is there a web site detailing the syntax
of the debugging of R? Hopefully it would be similar to java or C syntax.
See ?debug, in particular the use of c to run to the end of the current
context. So you can debug as before, but use c to run through the loop.
Alternatively, see ?browser, which drops you into the debugger wherever
you insert the browser() command, e.g.:
foo - function(n = 10) {
for(i in 1:n) {
cat(paste(Doing something #, i, \r))
Sys.sleep(0.5)
}
cat(\nFinished loop\n)
browser()
X - runif(100)
sumX - sum(X)
meanX - mean(X)
list(sum = sumX, mean = meanX)
}
Will start debugging foo() after the loop has finished.
You might also find Mark Bravington's debug package useful as it
implements further functions for debugging in R
HTH
G
Thanks.
waverley
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Gavin Simpson [t] +44 (0)20 7679 0522
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