On Jun 24, 2011, at 6:12 PM, StellathePug wrote:
Hello R Users!
I have a list called "tabs" that I would like to have the same
structure as
my list "eqSystem." The two look like they have the same structure
but they
are different because when I look at their attributes,
class(eqSystem[[1]])
is "call" but class(tabs[[1]]) is "formula". I want to have
class(tabs[[1]])
as a call too.
So what does "call" mean?
An as yet unevaluated function invocation with first as the named
function followed by quoted arguments is a "call":
See the help(call) page:
> f <- round
> A <- 10.5
> (g <- as.call(list(f, quote(A))))
.Primitive("round")(A)
> eval(g)
[1] 10
> call("mean", quote( c(1,2,3)))
mean(c(1, 2, 3))
> eval( call("mean", quote( c(1,2,3))))
[1] 2
It seems very unlikely that a formula object could be coerced into a
valid call simply by altering its class. To convince us otherwise you
need to provide more information than you have supplied to the
present. The results of str() on these objects might be a first step.
--
David.
And how do I make an object of class "formula" be of class "call"?
Thank you so much!!!--Rita
class(tabs)
[1] "list"
class(tabs[1])
[1] "list"
class(tabs[[1]])
[1] "formula"> class(eqSystem)
[1] "list"
class(eqSystem[1])
[1] "list"
class(eqSystem[[1]])
[1] "call"
Rita
=====================================
"If you think education is expensive, try ignorance."--Derek Bok
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