| on.exit {base} | R Documentation |
on.exit records the expression given as its argument as needing
to be executed when the current function exits (either naturally or as
the result of an error). This is useful for resetting graphical
parameters or performing other cleanup actions.
If no expression is provided, i.e., the call is on.exit(), then
the current on.exit code is removed.
on.exit is a primitive function so positional matching is
used and names of supplied arguments are ignored.
on.exit(expr, add = FALSE)
expr |
an expression to be executed. |
add |
if TRUE, add expr to be executed after any previously
set expressions; otherwise (the default) expr will overwrite
any previously set expressions. |
Invisible NULL.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
sys.on.exit which returns the expression stored for use
by on.exit() in the function in which sys.on.exit() is
evaluated.
opar <- par(mai = c(1,1,1,1)) on.exit(par(opar))