warning(..., call. = TRUE, immediate. = FALSE, noBreaks. = FALSE, domain = NULL) suppressWarnings(expr)
getOption("warn") <= 0<="" code="">.=>
options(warn = 1).
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
warning(immediate. = TRUE) turns
warn <= 0<="" code=""> 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
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.
stopfor fatal errors,
messagefor diagnostic messages,
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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