.id parameter for adply?

[krlmlr]

Similar to #188, as suggested there.

> adply(matrix(1:4, nrow=2), 2, function(a) data.frame(a=a))
  X1 a
1  1 1
2  1 2
3  2 3
4  2 4
> adply(matrix(1:4, nrow=2), 1:2, function(a) data.frame(a=a))
  X1 X2 a
1  1  1 1
2  2  1 2
3  1  2 3
4  2  2 4

Dimension names would do better here (see #190), but an .id parameter could be used to specify a replacement for X or to drop these columns altogether.

[jennybc]

👍

I just marked 30+ assignment in my class and saw alot of gymnastics around the X1 phenomenon above.

Things that would be nice:

• ability to suppress creation of X1
• ability to supply a different name in the adply() call

As for the values of X1:

I frequently find myself self-naming the input array, i.e. foo <- c('a', 'b', 'c'); names(foo) <- foo to make X1 more immediately useful downstream (after renaming).

[hadley]

I'd consider a pull request for this. (But needs to be in the next week or so)

[krlmlr]

I'll take a look. Are you interested in adding coverage analysis and linting?

[hadley]

No, because I'd be horrified!