warning {base} | R Documentation |
Generates a warning message that corresponds to its argument and the expression or function from which it was called.
warning(message)
message |
character string (of length 1) or NULL . |
The result depends on the value of
options("warn")
.
If warn
is negative warnings are ignored; if it is zero they
are stored and printed after the toplevel 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.
If warn
is zero (the default), a top-level variable
last.warning
is created. It contains the warnings which can be
printed via a call to warnings
.
stop
for fatal errors,
warnings
,
and options(warn=..)
.