trycatch: Evaluates an expression with the possibility to catch exceptions (DEPRECATED)

Description

This function is deprecated. Use tryCatch() instead. Evaluates an expression with the possibility to catch exceptions. The class of the exception thrown by a standard stop() call is try-error. Since it contains a dash, the name must be specfied within quotation marks. Alternatively, the name ANY can be use to catch any exception. See examples below. Note that the order which the catch-expressions are specify is important. For instance, an ANY catch at the beginning will catch all exception even if one specify other classes afterwards.

Usage

trycatch(expr, ..., finally=NULL, envir=parent.frame())

Arguments

expr

The expression to be evaluated.

...

A catch list of named expressions. The expression with the same name as the class of the Exception thrown when evaluating expr

finally

An expression that is guaranteed to be called even if
    the expression generates an exception.

envir

The environment in which the caught expression is to be
    evaluated.

`Value`

Returns the value of the last expression evaluated.

`Details`

To make trycatch() for other exception classes than
  try-error, the functions try() and stop()
  had to undergo minor(!) modification. However, they are fully
  compatible with the try() and
  stop() in the base package.

  To make exceptions to be thrown in the catch expression, e.g. in
  finally or ANY, such exceptions should extend
  (inherit from) the class try-error, which is for instance the
  case with all stop() and throw() generated exceptions.

  Currently, from R v1.8.0 there is a new implementation of trycatch(),
  which is a "wrapper" around the new tryCatch() function.
  If running R v1.7.1 or before the old trycatch() is used for
  backward compatibility.

`See Also`

From R v1.8.0 the tryCatch() method is available;
  see conditions.
  For more information about exceptions see Exception.
  There is also throw(), stop(), try().

`Examples`

Run this codeFor a complete example see help(Exception).
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