Hi,
On Fri, Nov 13, 2009 at 4:55 PM, Duncan Murdoch murd...@stats.uwo.ca wrote:
On 13/11/2009 7:26 PM, Gabor Grothendieck wrote:
On Fri, Nov 13, 2009 at 7:21 PM, Duncan Murdoch murd...@stats.uwo.ca
wrote:
On 13/11/2009 6:39 PM, Gabor Grothendieck wrote:
Note that one should use inherits =
On 11/16/2009 12:07 PM, Robert Gentleman wrote:
Hi,
On Fri, Nov 13, 2009 at 4:55 PM, Duncan Murdoch murd...@stats.uwo.ca wrote:
On 13/11/2009 7:26 PM, Gabor Grothendieck wrote:
On Fri, Nov 13, 2009 at 7:21 PM, Duncan Murdoch murd...@stats.uwo.ca
wrote:
On 13/11/2009 6:39 PM, Gabor
Robert Gentleman wrote:
Hi,
On Fri, Nov 13, 2009 at 4:55 PM, Duncan Murdoch murd...@stats.uwo.ca wrote:
On 13/11/2009 7:26 PM, Gabor Grothendieck wrote:
On Fri, Nov 13, 2009 at 7:21 PM, Duncan Murdoch murd...@stats.uwo.ca
wrote:
On 13/11/2009 6:39 PM, Gabor Grothendieck wrote:
Note that one
Greetings everyone,
I have a question about the default behaviour of a missing entry in an
environment.
Let us look at the following sequence of R statements:
e - new.env()
e$a - 1
e$a
[1] 1
e$b
NULL
I think I understand the logic for returning NULL to a missing entry in an
environment,
On 11/13/2009 2:03 PM, Trishank Karthik Kuppusamy wrote:
Greetings everyone,
I have a question about the default behaviour of a missing entry in an
environment.
Let us look at the following sequence of R statements:
e - new.env()
e$a - 1
e$a
[1] 1
e$b
NULL
I think I understand the
Hello Duncan,
Thanks for your reply.
On Nov 13, 2009, at 2:27 PM, Duncan Murdoch wrote:
You get the same behaviour when asking for a nonexistent element of a list,
or a nonexistent attribute. If you want stricter checking, don't use $, use
get():
get(b, e)
Error in get(b, e) :
On 11/13/2009 2:39 PM, Trishank Karthik Kuppusamy wrote:
Hello Duncan,
Thanks for your reply.
On Nov 13, 2009, at 2:27 PM, Duncan Murdoch wrote:
You get the same behaviour when asking for a nonexistent element of a list, or
a nonexistent attribute. If you want stricter checking, don't use
On Nov 13, 2009, at 2:47 PM, Duncan Murdoch wrote:
Inconsistent with what happens for lists:
x - list()
x$b
NULL
and attributes:
attr(x, b)
NULL
Ah, I see. I would claim that the same argument for default safety should apply
here too.
It is already a little stricter than $ on
If you develop your own code you can add your own behavior by
extending the environment class. I put extending in quotation
marks, because 'environment' is one of few classes you should *not*
extend from in the regular S3 (and S4?) sense, at least that was the
case a few years ago. You can
Hello Henrik,
On Nov 13, 2009, at 3:42 PM, Henrik Bengtsson wrote:
If you develop your own code you can add your own behavior by
extending the environment class. I put extending in quotation
marks, because 'environment' is one of few classes you should *not*
extend from in the regular S3
On 11/13/2009 3:03 PM, Trishank Karthik Kuppusamy wrote:
On Nov 13, 2009, at 2:47 PM, Duncan Murdoch wrote:
Inconsistent with what happens for lists:
x - list()
x$b
NULL
and attributes:
attr(x, b)
NULL
Ah, I see. I would claim that the same argument for default safety should apply
Note that one should use inherits = FALSE argument on get and exists
to avoid returning objects from the parent, the parent of the parent,
etc.
On Fri, Nov 13, 2009 at 2:27 PM, Duncan Murdoch murd...@stats.uwo.ca wrote:
On 11/13/2009 2:03 PM, Trishank Karthik Kuppusamy wrote:
Greetings
On 13/11/2009 6:39 PM, Gabor Grothendieck wrote:
Note that one should use inherits = FALSE argument on get and exists
to avoid returning objects from the parent, the parent of the parent,
etc.
I disagree. Normally you would want to receive those objects. If you
didn't, why didn't you set
On Fri, Nov 13, 2009 at 7:21 PM, Duncan Murdoch murd...@stats.uwo.ca wrote:
On 13/11/2009 6:39 PM, Gabor Grothendieck wrote:
Note that one should use inherits = FALSE argument on get and exists
to avoid returning objects from the parent, the parent of the parent,
etc.
I disagree. Normally
On 13/11/2009 7:26 PM, Gabor Grothendieck wrote:
On Fri, Nov 13, 2009 at 7:21 PM, Duncan Murdoch murd...@stats.uwo.ca wrote:
On 13/11/2009 6:39 PM, Gabor Grothendieck wrote:
Note that one should use inherits = FALSE argument on get and exists
to avoid returning objects from the parent, the
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