[R] apply and factor

[Don MacQueen]

Simpler still is to just type the name at the command line (without 
parentheses, in case it's a function, in order to avoid unwanted side 
effects).

If the name is already in use, it'll be obvious, equally obvious if it isn't.
Not suitable for use in a program, of course, and if the object 
exists and is big a lot of stuff will spew, which can be annoying.

-Don

At 3:15 PM +0200 8/10/01, Laurent Gautier wrote:
>Jim Lemon wrote:
>>
>>  Prof Brian Ripley wrote:
>>  >
>>  > There is a function conflicts() to do the checking.
>>  > Deliberate overrides are fairly common, for example when debugging,
>>  > and it is probably better to get into the habit of using conflicts()
>>  > if you get strange results.
>>  >
>>  Martin Maechler kindly informed me of conflicts() after I had posted a
>>  suggestion for dup.name(). However, conflicts() only tells you _after_
>>  you have clobbered something, while dup.name() allows you to check
>>  beforehand. I do agree that it is a time-consuming operation, as
>>  dup.name() takes about 5 seconds to run. It's mostly useful to avoid
>>  trashing a laboriously constructed data set in the working directory.
>>
>
>
>What about using exists()  ?
>Then digging if something exists....
>
>Regards,
>
>Laurent
>
>--
>Laurent Gautier			CBS, Building 208, DTU
>PhD. Student			D-2800 Lyngby,Denmark
>tel: +45 45 25 24 85		http://www.cbs.dtu.dk/laurent
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-- 
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
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