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Hi, I'm trying to learn how to use the tryCatch condition system and am confused about the behavior when I set the call arg of a simpleCondition. I want to catch an error if it meets a certain criteria and otherwise reraise it. I want the error message to indicate the function in which the error occured (and not mention tryCatch). Wanted: > g("foo") ## error caught [1] "caught foo" > g("o...

...keep the code clean and I want to avoid nested if statements. Further conditions down the stream would make the code quite ugly. Pretty much for the same reason you use 'return()' and 'break'. A nicer and more general solution is to have a subclass "simpleExit" of "simpleCondition" and make source() catch such signals via tryCatch(..., simpleExit=function(se) {...}). Here is a complete example: simpleExit <- function(...) { cond <- simpleCondition(...) class(cond) <- c("simpleExit", class(cond)) cond } exit <- function(...) { invisibl...

is it possible to throw a stop() that is so hard that it will escape even tryCatch? /iaw ---- Ivo Welch (ivo.welch at gmail.com)

...e("foo")} { } statement, but the above is to avoid such nested code, especially in example code, cf. return() and break. Here are the details to get this working: 1. Define a new condition class similar to simpleWarning() and simpleError(): simpleExit <- function(...) { cond <- simpleCondition(...) class(cond) <- c("simpleExit", class(cond)) cond } 2. Setup a method to generate such a condition similar to warning() and stop(): exit <- function(...) { invisible(signalCondition(simpleExit(...))) } } 3. That is the basic framework. We can then use tryCatch() to c...