How to unmask a function in R, due to name collisions on searchpath
When I lo开发者_如何学运维aded package debug
to debug a script with zoo
objects, I got trouble: function index
from zoo
got masked by debug
package. How can I unmask index
? In general, how to deal with these name colliding problems? We just do not use debug
package with `zoo'?
You can detach the package which has masked functions and then reattach it. It will regain precedence in the search path:
detach("package:zoo")
library("zoo")
In the future, if you want to attach a package while preventing it from masking other functions, you can specify its position in the search path with an arbitrary large number:
library("debug", pos = .Machine$integer.max)
Exported symbols are always identifiable with the ::
operator:
zoo::index
Hidden functions not declared in the namespace can still be accessed using :::
(triple-colon), and example would be
zoo:::.onLoad
which you can see even though it is not exported.
Its only masked to you but its not masked to zoo so when a zoo function tries to use index it will still find its own index first.
zoo also has a time.zoo method so if z is a zoo object you can use time(z) in place of index(z).
Finally you can always refer to zoo::index to make sure you get the one in zoo.
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