R, get key from key value (hash)

Question

quick question. My List (in R) looks like:

> mylist
$width
[1] 32

With mylist[1] I get:

$width
[1] 32

But how do I get:

$width

Thanks and cheers.

Solution

The names of elements are stored in an attribute called "names", which can be accessed via the names function.

Try this:

mylist <- list(width=42, height=13)
names(mylist)    # "width"  "height"
names(mylist)[1] # "width"

mylist[["width"]] # 42

mylist[sort(names(mylist))] # sort mylist by the names...