Nothing
# stop()
stop("This is an error.\n")
a <- 3
if (a != 5) {stop("'a' should be equal to 5.\n")}
if (!(a == 5)) {stop("'a' should be equal to 5.\n")}
stopifnot(a == 5)
# warning()
warning("This is a warning.\n")
if (a != 5) {warning("'a' should be equal to 5.\n")}
suppressWarnings(warning("This is a warning.\n"))
# message()
message("This is a diagnostic message.\n")
if (a != 5) {message("'a' should be equal to 5.\n")}
suppressMessages(message("This is a diagnostic message.\n"))
# return()
test.fun <- function(x) {
y <- x + 10
return(y)
}
test.fun(x = 23)
# options()
options(error = NULL)
options(error = dump.frames)
options(error = recover)
options(warn = -1) # warnings ignored
options(warn = 0) # default; warnings stored
options(warn = 1) # warnings printed
options(warn = 2) # Warnings turned into errors
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