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Does anyone have examples/tutorials of exception handling in R? The official documentation is very terse.
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In R Programming, there are basically two ways in which we can implement an error handling mechanism. Either we can directly call the functions like stop() or warning(), or we can use the error options such as “warn” or “warning. expression”.
The tryCatch() function is the workhorse of handling errors and warnings in R. The first argument of this function is any R expression, followed by conditions which specify how to handle an error or a warning.
Ruby provide a nice mechanism to handle exceptions. We enclose the code that could raise an exception in a begin/end block and use rescue clauses to tell Ruby the types of exceptions we want to handle.
An exception is a response to an exceptional circumstance that arises while a program is running, such as an attempt to divide by zero. Exceptions provide a way to transfer control from one part of a program to another. VB.Net exception handling is built upon four keywords - Try, Catch, Finally and Throw.
Basically you want to use the tryCatch() function. Look at help("tryCatch") for more details.
Here's a trivial example (keep in mind that you can do whatever you want with an error):
vari <- 1 tryCatch(print("passes"), error = function(e) print(vari), finally=print("finished")) tryCatch(stop("fails"), error = function(e) print(vari), finally=print("finished")) Have a look at these related questions:
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