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Exceptions Debugging
hadley edited this page Oct 19, 2010
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26 revisions
stop()
warning()
message()
try
tryCatch
Examples:
- capturing all messages or warnings produced by a function
- capturing user interrupts:
Ctrl + C
-
traceback
: show where error occurred -
browser
: interact inside function environment.c
,n
,return
,Q
,where
-
debug
/undebug
,debugonce
: automatically inserts browser -
trace
,untrace
: automatically inserts any code -
recover
,options(error = recover)
: automatic traceback + browser on error
If you're trying to track down where a warning occurs, it can be useful to turn it into an error with options(warn = 2)
. Turn back to default behaviour with options(warn = 0)
.
Don't forget that you can combine if
statements with browser()
to only debug when a certain situation occurs.