[R] Why a list of NULL's are reduced to NULL?
mailinglist.honeypot at gmail.com
Fri Dec 11 22:49:01 CET 2009
On Dec 11, 2009, at 4:45 PM, Peng Yu wrote:
> On Fri, Dec 11, 2009 at 2:37 PM, Charlie Sharpsteen
> <chuck at sharpsteen.net> wrote:
>> On Fri, Dec 11, 2009 at 10:24 AM, Peng Yu <pengyu.ut at gmail.com> wrote:
>>> How do you figure out all the possibilities?
>> Well, the "Value" section of the third party function's help page should
>> outline the return types it produces. If it doesn't cover all cases, write
>> a letter to the package maintainer. If you are using third party functions
>> that are not packaged with help pages, then this sort of uncertainty is part
>> of using unpublished code.
> A document may not document all the corner cases. Even if it is so,
> you can never be sure unless all the possibilities are examined .
No, you can be sure. Just look at the code of the function that is ill behaved.
As Don asked: are you actually experiencing this problem with a library on CRAN?
Graduate Student: Computational Systems Biology
| Memorial Sloan-Kettering Cancer Center
| Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/~lianos/contact
More information about the R-help