Utility function to find and display R documentation.
a character string: see ‘Details’.
an optional character string giving the preferred format. Can be abbreviated.
an optional character string specifying the name of a package within which to look for documentation.
what can specify one of several different sources of documentation,
including the R manuals (
COPYING (the GPL licence), any of the licenses in
FAQ (also available as
R-FAQ), and the files in ‘R_HOME/doc’.
Only on Windows, the R for Windows FAQ is specified by
package is supplied, documentation is looked for in the
‘doc’ and top-level directories of an installed package of that name.
what is missing a brief usage message is printed.
The documentation types are tried in turn starting with the first
"pdf" if none is specified).
A invisible character string given the path to the file found.
For displaying regular help files,
type = "txt",
file.show is used.
vignettes are nicely viewed via
RShowDoc(*, package= . ).
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