source {base} | R Documentation |
source
causes R to accept its input from the named file (the
name must be quoted). Input is read from that file until the end of
the file is reached. parse
is used to scan the
expressions in, they are then evaluated sequentially in the chosen
environment.
source(file, local = FALSE, echo = verbose, print.eval = echo, verbose = getOption("verbose"), prompt.echo = getOption("prompt"), max.deparse.length = 150, chdir = FALSE)
file |
a connection or a character string giving the name of the file to read from. |
local |
if local is FALSE , the statements scanned
are evaluated in the user's workspace (the global environment),
otherwise in the environment calling source . |
echo |
logical; if TRUE , each expression is printed
after parsing, before evaluation. |
print.eval |
logical; if TRUE , the result of
eval(i) is printed for each expression i ; defaults
to echo . |
verbose |
if TRUE , more diagnostics (than just
echo = TRUE ) are printed during parsing and evaluation of
input, including extra info for each expression. |
prompt.echo |
character; gives the prompt to be used if
echo = TRUE . |
max.deparse.length |
integer; is used only if echo is
TRUE and gives the maximal length of the ``echo'' of a
single expression. |
chdir |
logical; if TRUE , the R working directory is
changed to the directory containing file for evaluating. |
All versions of R accept input from a connection with end of line marked by LF (as used on Unix), CRLF (as used on DOS/Windows) or CR (as used on Mac). The final line can be incomplete, that is missing the final EOL marker.
demo
which uses source
;
eval
, parse
and scan
; options("keep.source")
.