Demonstrations of R Functionality
demo is a user-friendly interface to running some demonstration
demo() gives the list of available topics.
demo(topic, package = NULL, lib.loc = NULL, character.only = FALSE, verbose = getOption("verbose"), echo = TRUE, ask = getOption("demo.ask"), encoding = getOption("encoding"))
the topic which should be demonstrated, given as a name or literal character string, or a character string, depending on whether
TRUE. If omitted, the list of available topics is displayed.
a character vector giving the packages to look into for demos, or
NULL. By default, all packages in the search path are used.
a character vector of directory names of R libraries, or
NULL. The default value of
NULLcorresponds to all libraries currently known. If the default is used, the loaded packages are searched before the libraries.
topicas character string.
a logical. If
TRUE, additional diagnostics are printed.
a logical. If
TRUE, show the R input when sourcing.
a logical (or
"default") indicating if
devAskNewPage(ask = TRUE)should be called before graphical output happens from the demo code. The value
"default"(the factory-fresh default) means to ask if
echo == TRUEand the graphics device appears to be interactive. This parameter applies both to any currently opened device and to any devices opened by the demo code. If this is evaluated to
TRUEand the session is interactive, the user is asked to press RETURN to start.
source. If the package has a declared encoding, that takes preference.
If no topics are given,
demo lists the available demos. The
corresponding information is returned in an object of class
demo() # for attached packages ## All available demos: demo(package = .packages(all.available = TRUE)) ## Display a demo, pausing between pages demo(lm.glm, package = "stats", ask = TRUE) ## Display it without pausing demo(lm.glm, package = "stats", ask = FALSE) ch <- "scoping" demo(ch, character = TRUE) ## Find the location of a demo system.file("demo", "lm.glm.R", package = "stats")