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, noBreaks. = 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.
logical, indicating as far as possible the message should
be output as a single line when
options(warn = 1).
expression to evaluate.
The warning message as
character string, invisibly.
The result depends on the value of
options("warn") and on handlers established in the
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
warning(immediate. = TRUE) turns
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
characters, default 1000, indicated by
While the warning is being processed, a
is available. If this restart is invoked with
warning returns immediately.
An attempt is made to coerce other types of inputs to
to character vectors.
suppressWarnings evaluates its expression in a context that
ignores all warnings.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
stop for fatal errors,
message for diagnostic messages,
options with argument
gettext for the mechanisms for the automated translation
testit <- function() warning("testit") testit() ## shows call testit <- function() warning("problem in testit", call. = FALSE) testit() ## no call suppressWarnings(warning("testit"))
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