message

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Diagnostic Messages

Generate a diagnostic message from its arguments.

Keywords
programming
Usage
message(..., domain = NULL, appendLF = TRUE) suppressMessages(expr)
packageStartupMessage(..., domain = NULL, appendLF = TRUE) suppressPackageStartupMessages(expr)
.makeMessage(..., domain = NULL, appendLF = FALSE)
Arguments
...
zero or more objects which can be coerced to character (and which are pasted together with no separator) or (for message only) a single condition object.
domain
see gettext. If NA, messages will not be translated, see also the note in stop.
appendLF
logical: should messages given as a character string have a newline appended?
expr
expression to evaluate.
Details

message is used for generating ‘simple’ diagnostic messages which are neither warnings nor errors, but nevertheless represented as conditions. Unlike warnings and errors, a final newline is regarded as part of the message, and is optional. The default handler sends the message to the stderr() connection.

If a condition object is supplied to message it should be the only argument, and further arguments will be ignored, with a warning.

While the message is being processed, a muffleMessage restart is available.

suppressMessages evaluates its expression in a context that ignores all ‘simple’ diagnostic messages.

packageStartupMessage is a variant whose messages can be suppressed separately by suppressPackageStartupMessages. (They are still messages, so can be suppressed by suppressMessages.)

.makeMessage is a utility used by message, warning and stop to generate a text message from the ... arguments by possible translation (see gettext) and concatenation (with no separator).

See Also

warning and stop for generating warnings and errors; conditions for condition handling and recovery.

gettext for the mechanisms for the automated translation of text.

Aliases
  • message
  • suppressMessages
  • packageStartupMessage
  • .packageStartupMessage
  • suppressPackageStartupMessages
  • .makeMessage
Examples
library(base) message("ABC", "DEF") suppressMessages(message("ABC")) testit <- function() { message("testing package startup messages") packageStartupMessage("initializing ...", appendLF = FALSE) Sys.sleep(1) packageStartupMessage(" done") } testit() suppressPackageStartupMessages(testit()) suppressMessages(testit())
Documentation reproduced from package base, version 3.2.0, License: Part of R 3.2.0

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