Adding Descriptive Text to a Variable
Is there a command, or method for adding descriptive text to开发者_如何学编程 a variable such that when you call for the str() of the variable you also see an attribute that describes what's in it?
I find, in some cases that commenting my code is simply not enough (especially when working with a lot of variables).
Brandon,
comment()
and attr()
can be useful here. This recent post has some really good information on this.
From the help page for comment()
:
x <- matrix(1:12, 3,4)
comment(x) <- c("This is my very important data from experiment #0234",
"Jun 5, 1998")
x
comment(x)
and str(x)
returns:
> str(x)
int [1:3, 1:4] 1 2 3 4 5 6 7 8 9 10 ...
- attr(*, "comment")= chr [1:2] "This is my very important data from experiment #0234" "Jun 5, 1998"
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