[R] getting arg names in function calls?
spencer.graves at structuremonitoring.com
Tue Apr 8 00:05:20 CEST 2014
How can I convert "plot(0, 1)" into "plot(x=0, y=1)"?
More generally, how can I get argument names assigned to function
calls in "language" objects?
tstFn <- function()plot(0, 1)
bo <- body(tstFn)
tstFnxy <- function()plot(x=0, y=1)
boxy <- body(tstFnxy)
Is there a function that will modify "bo" to match "boxy"?
My current solution requires me to know the names of the
arguments for "plot" (in this example). I'd prefer a more general
p.s. I'm trying to create an animation by repeatedly calling a function
that contains something like text(0, 1, "abc"). By computing on the
language object 'text(0, 1, "abc")', I can call text(0, 1, 'a') the
first time, text(0, 1, 'ab') the second, and text(0, 1, 'abc') the
third. The function will be more general if I can get the names of the
arguments as just described.
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