On 13-11-13 6:52 PM, Arunkumar Srinivasan wrote:
Duncan,
Thank you. What I meant was that "^" is the only *arithmetic operator*
to result in a matrix on operating in a data.frame. I understand it's
quite old code. Also, your explanation makes sense, with the exception
of "/" operator, I suppose (I could be wrong here).
You're right, "/", "%/%" and "%%" also return consistent types. So my
explanation is wrong. The NEWS entry for this change appears to be in
the 0.63 release,
o Ops.data.frame : things like d.fr < a now return a matrix
That doesn't give much of a hint for why "^" is handled differently than
"/".
Duncan Murdoch
Arun
On Thursday, November 14, 2013 at 12:32 AM, Duncan Murdoch wrote:
It's not just ^ that is missing, the logical relations like <, ==, etc
also return matrices. This is very old code (I think from 1999), but I
would guess that the reason is that the ^ and < operators always return
values of a single type (numeric and logical respectively), whereas the
other operators can take mixed type inputs and return mixed type outputs.
Duncan Murdoch
Please let me know if I should be posting this to R-devel list instead.
Thank you very much,
Arun
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