On 10.01.2011 14:39, carol white wrote:
In fact, what the function is returning is the most important. So knowing that
the parameters and the number of parameters of my.func defined by the user could
be different from one definition to another, how to use what my.func returns in
other functions? Moreover, if the function is defined by the user in an R
session, it is then defined globally. In this case, does it need to be passed as
a parameter? Note that my.func defined by me is loaded before.
It depends.
1. The output of a function can always be wrapped in a list.
2. You should always pass objects that you want to use in another
environment unless you really know what you are doing - and reading does
not suggest you are too sure about it.
3. In this case, if your package has a Namespace, your own function
rather than a user generated one in the .GlobalEnv will be found.
Note that defining stuff in .GlobalEnv and relying on the fact that this
version is found by another function would imply you really have to get
it from the specific environment.
Best,
Uwe
Carol
----- Original Message ----
From: Uwe Ligges<lig...@statistik.tu-dortmund.de>
To: carol white<wht_...@yahoo.com>
Cc: r-h...@stat.math.ethz.ch
Sent: Mon, January 10, 2011 2:11:48 PM
Subject: Re: [R] Evaluation of variable assigned to a function name
Wel, just let the user give the function in form of an argument, say
"foo", and use your code so that
bar<- function(x, ....., foo){
if(missing(foo)) foo<- Namespace::my.func
.....
}
but perhaps I misunderstood your question.
Uwe Ligges
On 10.01.2011 13:47, carol white wrote:
Hi,
I have defined a function (my.func) which is used as parameter (f) of another
function. As I want to give the user the possibility to define his own
function
instead of my.func, how can I find out if in other functions, the parameter f
has the my.func value (if the user has defined a new function or not)?
Moreover, I think I should impose to the user to use another function name
than
my.func for this (?). Or a boolean variable is better to be used to indicate
if
my function (my.func) or user-defined function is used?
Thanks
Carol
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