warning(…, call. = TRUE, immediate. = FALSE, noBreaks. = FALSE, domain = NULL) suppressWarnings(expr)
getOption("warn") <= 0.
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.
warningsignals 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
warnis 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 <= 0into
warn = 1for this call only. If
warnis zero (the default), a read-only variable
last.warningis created. It contains the warnings which can be printed via a call to
warnings. Warnings will be truncated to
getOption("warning.length")characters, default 1000, indicated by
[... truncated]. While the warning is being processed, a
muffleWarningrestart is available. If this restart is invoked with
warningreturns immediately. An attempt is made to coerce other types of inputs to
warningto character vectors.
suppressWarningsevaluates its expression in a context that ignores all warnings.
stopfor fatal errors,
messagefor diagnostic messages,
gettextfor the mechanisms for the automated translation of messages.
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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