Throws an Exception

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 separator sep="". For instance, to throw an exception, 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 classes inheriting Exception, which can then be caught (or not) using tryCatch().

# Default S3 method
throw(...)

Arguments

...

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

Value

Returns nothing.

Author

Henrik Bengtsson

See also

See the Exception class for more detailed information.

Examples

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