CODEWITHSUNDEEP
r
dmitriy
dmitriy

Reputation: 253

I don't understand how to catch an error

II don't understand how to catch an error.

For example i wrote a script:

morph_input = tryCatch(prepareMorphObjectFromFiles(InputConfig,InputGOI),
              error=stop("Please Start Over,your Data Sets or uploaded GOI are not suitable."))

I want that if the function prepareMorphObjectFromFiles(InputConfig,InputGOI) will break, just then the error will pop out. but it always pop out even if the function didn't break.

Upvotes: 1

Views: 158

Answers (2)

Tyler Rinker
Tyler Rinker

Reputation: 109864

@gagolews gives what most would prefer. I like using just try and it helps me to think more linear about my code (i.e. in steps).

out <- try({
   if (runif(1) > .7) stop("catch me if you can!")
   else "OK"
}, silent = TRUE)

if(inherits(out, "try-error")) message("went bad")

Upvotes: 2

gagolews
gagolews

Reputation: 13046

You should pass an error handling function as the error argument in tryCatch(). Otherwise it indeed will always be evaluated. An example:

tryCatch({
   if (runif(1) > 0.8) stop("catch me if you can!")
   else "OK"
},
error=function(err) {
   # an error handler
   cat("An error occured.\n")
})

Upvotes: 4

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