R.oo (version 1.0.3)

throw: Throws an Exception

Description

Throws an exception similar to stop(), but with support for exception classes. The first argument (object) is by default pasted together with other arguments (...) and with seperator sep="". In other words, instead of doing: stop(paste("Value out of range: ", value, ".", sep="")) it is shorter to write throw("Value out of range: ", value, "."). which is short for throw(Exception("Value out of range: ", value, ".")). Note that throw() can be defined for specific classes, which can then be caught (or not) using tryCatch().

Usage

## S3 method for class 'default}(...)':
throwundefined

...{One or several strings that are concatenated and collapsed
      into on message string.}

Returns nothing.

rbern <- function(n=1, prob=1/2) {
    if (prob < 0 || prob > 1)
      throw("Argument 'prob' is out of range: ", prob)
    rbinom(n=n, size=1, prob=prob)
  }

  rbern(10, 0.4)
  # [1] 0 1 0 0 0 1 0 0 1 0
  tryCatch(rbern(10, 10*0.4),
    error=function(ex) {}
  )

[object Object]

See the Exception class for more detailed information.

error