With regards to my question below, I've found a way to do it:
all.names(body(test))
Seems to do the trick. Still, if there are any tools already developed
for mapping the dependencies between a set of functions I be very
interested to hear before I reinvent the wheel.
Thanks,
Dave
-----Original Message-----
From: David Khabie-Zeitoune
Sent: 13 August 2003 14:01
To: r-help at stat.math.ethz.ch
Subject: [R] Mapping function dependencies
Hi
Does anyone know of any automatic way of mapping out the dependencies of
a function -- i.e. automatically listing which other functions that
function calls? I tried using all.names or all.vars, but I can't get it
to work on a function: e.g.
> test = function(x, y) return(sin(x + y)*cos(x + y))
> all.names(expression(test))
[1] "test"
I guess the problem is that all.names is not being applied to the body
of the function, whereas if I write the function definition out
explicitly in the expression, I can readily get what I want:
> tmp = all.names(expression(function(x, y) return(sin(x + y)*cos(x +
y))))> tmp
[1] "function" "return" "*"
"sin" "+" "x"
[7] "y" "cos" "+"
"x" "y"
and further process this to get the functional dependencies
> pos.fn = sapply(tmp,function(.x) if (exists(.x)) is.function(get(.x))
else FALSE)> tmp[pos.fn]
[1] "function" "return" "*"
"sin" "+" "cos"
"+"
However, this relies on writing out the function definition explicitly
out in the expression which I cannot do as I wish to map the
dependencies of large complex functions.
Thanks for your help.
David
______________________________________________
R-help at stat.math.ethz.ch mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help