Testing whether R command has error or not in ifelse command

Question

I want to check whether R command has error or not in iflese command. Similar to following one. I wonder how to accomplish this one. Actually I want to run the following code only if there is no error in the previous R code.

ifelse(
      test= Check R Command has error or not
    , yes = FALSE
    , no = TRUE
    )


ifelse(
      test= log("a") # Has error
    , yes = 3
    , no = 1
    )

This should be a good read: http://stackoverflow.com/questions/12193779/how-to-write-trycatch-in-r — nico, Oct 05 '14 at 09:14
Thanks @jbaums for your nice comment. Would you like to convert your comment to answer. Thanks — MYaseen208, Oct 05 '14 at 11:17

score 5 · Accepted Answer · answered Oct 05 '14 at 11:30

You can use tryCatch for this:

tryCatch({
  log(10)
  1
}, error=function(e) 3)

# [1] 1


tryCatch({
  log('a')
  1
}, error=function(e) 3)

# [1] 3

In the second example above, the first expression (which can be multi-line, as above) throws an error, so the expression passed to the error argument is executed.

Testing whether R command has error or not in ifelse command

1 Answers1