Functions to access the function call stack.
Usage
sys.call(which=<<see below>>)
sys.frame(which=<<see below>>)
sys.nframe()
sys.function(n=<<see below>>)
sys.parent(n=1)
sys.calls()
sys.frames()
sys.parents()
sys.on.exit()
sys.status()
Arguments
which
|
the frame number.
|
n
|
the number of frame generations to go back.
|
Description
These functions provide access to environments (``frames''
in S-speak) associated with functions further up the calling stack.See Also
eval for the usage of sys.frame.Examples
ff <- function(x) gg(x)
gg <- function(y) sys.status()
str(ff(1))