Generates a warning message that corresponds to its argument(s) and (optionally) the expression or function from which it was called.
warning(..., call. = TRUE, immediate. = FALSE, domain = NULL) suppressWarnings(expr)
- zero or more objects which can be coerced to character (and which are pasted together with no separator) or a single condition object.
- logical, indicating if the call should become part of the warning message.
- logical, indicating if the call should be output immediately, even if
getOption("warn") <= 0.
- expression to evaluate.
NA, messages will not be translated.
The result depends on the value of
options("warn") and on handlers established in the executing code.
If a condition object is supplied it should be the only argument, and further arguments will be ignored, with a message.
warning signals a warning condition by (effectively) calling
signalCondition. If there are no handlers or if all handlers return, then the value of
warn = getOption("warn") is used to determine the appropriate action. If
warn is negative warnings are ignored; if it is zero they are stored and printed after the top--level function has completed; if it is one they are printed as they occur and if it is 2 (or larger) warnings are turned into errors. Calling
warning(immediate. = TRUE) turns
warn <= 0 into
warn = 1 for this call only.
warn is zero (the default), a read-only variable
last.warning is created. It contains the warnings which can be printed via a call to
Warnings will be truncated to
getOption("warning.length") characters, default 1000, indicated by
An attempt is made to coerce other types of inputs to
warning to character vectors.
suppressWarnings evaluates its expression in a context that ignores all warnings.
The warning message as
character string, invisibly.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
gettext for the mechanisms for the automated translation of messages.
Documentation reproduced from R 2.15.3. License: GPL-2.