demo {utils} | R Documentation |
demo
is a user-friendly interface to running some demonstration
R scripts. 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"))
topic |
the topic which should be demonstrated, given as a
name or literal character string, or a character string,
depending on whether character.only is FALSE (default)
or TRUE . If omitted, the list of available topics is
displayed. |
package |
a character vector giving the packages to look into for
demos, or NULL . By default, all packages in the search path
are used. |
lib.loc |
a character vector of directory names of R libraries,
or NULL . The default value of NULL corresponds to all
libraries currently known. If the default is used, the loaded
packages are searched before the libraries. |
character.only |
logical; if TRUE , use topic as
character string. |
verbose |
a logical. If TRUE , additional diagnostics are
printed. |
echo |
a logical. If TRUE , show the R input when sourcing. |
ask |
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 == TRUE and 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 no topics are given, demo
lists the available demos. The
corresponding information is returned in an object of class
"packageIQR"
. The structure of this class is experimental. In
earlier versions of R, an empty character vector was returned along
with listing available demos.
source
and devAskNewPage
which
are called by demo
.
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) ## Not run: ch <- "scoping" demo(ch, character = TRUE) ## End(Not run) ## Find the location of a demo system.file("demo", "lm.glm.R", package="stats")