From hpages at fhcrc.org  Tue May  6 21:23:05 2014
From: hpages at fhcrc.org (=?UTF-8?B?SGVydsOpIFBhZ8Oocw==?=)
Date: Tue, 06 May 2014 12:23:05 -0700
Subject: [Rd] Historical NA question
In-Reply-To: <CAF8bMcbt5j70eLj_ijMTvX5wFmXW_ZCrMTYzZO6MovASADnhuA@mail.gmail.com>
References: <CABdHhvFt2n6=ORLBSTYxkA_G+t_d_H=0B1+vhhM_ZFL_Z-RT3g@mail.gmail.com>
	<5366EAC6.9030109@yorku.ca> <53681944.9020606@fhcrc.org>
	<4BBA43DC-39CB-4CCC-9172-E2318459FD77@gmail.com>
	<CAF8bMcbt5j70eLj_ijMTvX5wFmXW_ZCrMTYzZO6MovASADnhuA@mail.gmail.com>
Message-ID: <53693699.9080502@fhcrc.org>

On 05/06/2014 08:54 AM, William Dunlap wrote:
> You can also use is.element(els,set) instead of the equivalent
> els%in%set

No they are not *equivalent*. Equivalent means you could substitute
one by the other in your code without changing its behavior.

H.

> and leave your precedence problems behind.
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
>
> On Mon, May 5, 2014 at 10:35 PM, peter dalgaard <pdalgd at gmail.com> wrote:
>>
>> On 06 May 2014, at 01:05 , Herv? Pag?s <hpages at fhcrc.org> wrote:
>>
>>>
>>> BTW, that %in% has precedence over arithmetic operations is surprising,
>>> error-prone, and doesn't cover any reasonable use case (who needs to
>>> multiply the logical vector returned by %in% by some value?) but that's
>>> another story:
>>
>> The point here is that the %foo% operators all have the _same_ precedence. In principle, they can be user-coded, and there is no way to express what precedence is desirable. It may turn out slightly weird for %in%, but think of what would happen if %*% had lower precedence than addition.
>>
>> --
>> Peter Dalgaard, Professor,
>> Center for Statistics, Copenhagen Business School
>> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
>> Phone: (+45)38153501
>> Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com
>>
>> ______________________________________________
>> R-devel at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel

-- 
Herv? Pag?s

Program in Computational Biology
Division of Public Health Sciences
Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N, M1-B514
P.O. Box 19024
Seattle, WA 98109-1024

E-mail: hpages at fhcrc.org
Phone:  (206) 667-5791
Fax:    (206) 667-1319



[Rd] Historical NA question
=?UTF-8?B?SGVydsOpIFBhZ8Oocw==?=