I have an environment of objects that are either xts or NULL. I would like to remove all the NULL from the environment. Is there a function I can use with eapply to achieve this?
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Joshua Ulrich
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1 Answers
8
rm(
list=names(
which(
sapply(globalenv(),is.null) # or .GlobalEnv
)
)
)
If it's not the global environment, you can use the envir switch in rm and wrap the environment name in getenv() in the sapply call
Brandon Bertelsen
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1`globalenv()` would be better (less obscure). – Gavin Simpson Oct 26 '12 at 21:46
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1@GavinSimpson Hrmmm, why would you say using .GlobalEnv is obscure? – Brandon Bertelsen Oct 26 '12 at 21:48
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It is the **actual** global envioronmnent and the `.` in the name means it is hidden or intended to be hidden from normal view. `globalenv()` is the accessor function. – Gavin Simpson Oct 26 '12 at 21:52
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Interesting. Strange that it doesn't work that way in practice. – Brandon Bertelsen Oct 26 '12 at 21:54
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I mean that it seems to act in a manner that's almost interchangeable with `globalenv()`. – Brandon Bertelsen Oct 26 '12 at 22:21
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2Yes, that is my point. `.GlobalEnv` is the object that *is* the global environment, the actual thing. `globalenv()` returns this. It's a bit like `mod$coefficients` and coef(mod)` both give you what you want but it is better to access via the accessor function than directly. – Gavin Simpson Oct 26 '12 at 22:23
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1You're going to laugh but I also commonly use `$coefficients`. Hopeless. lol – Brandon Bertelsen Oct 26 '12 at 23:17