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A small collection of debugging tools in R
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# to get to the recover list - allows you to walk through all frames | |
options(error = recover) | |
# to get back from a call to the options page again, use `c` | |
# just loading any library to try these functions out | |
library(gets) | |
# trace will execute any function when you execute the first function | |
# e.g. it will execute `browser` when I execute `getsm` | |
trace(getsm, browser) | |
# But I can also tell it to execute at a certain point | |
# To figure out which expression is which number, you can look at the list e.g. through this | |
# as.list(body(fun)) | |
# In our case: | |
as.list(body(getsm)) | |
# Then the function looks like this: | |
trace(getsm, browser, at = 5) | |
# To debug a function that is an S3 method or a hidden function, you also need to specfiy the 'where' argument | |
trace(what = isat.default, tracer = browser, at = 10, where = gets) | |
getsm(arx(y = rnorm(100), mc = TRUE)) | |
# To stop tracing this | |
untrace(getsm) | |
# debug | |
# debug will simply open a browser straight away when I execute it | |
debug(isat) | |
data(Nile) | |
isat(Nile) | |
# stop behaviour | |
undebug(isat) | |
# traceback | |
# to get a full historythe command | |
traceback() | |
# Change only one function in a package with your custom function | |
environment(create.ncdf.output.files.custom) <- asNamespace('climdex.pcic.ncdf') | |
assignInNamespace("create.ncdf.output.files", create.ncdf.output.files.custom, ns = "climdex.pcic.ncdf") |
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