[R] Does R have a "const object"?

[Henrik Bengtsson]

On Wed, Mar 16, 2011 at 6:04 AM, Michael Friendly <friendly at yorku.ca> wrote:
> On 3/15/2011 2:23 PM, Uwe Ligges wrote:
>>
>>
>> On 15.03.2011 15:53, xiagao1982 wrote:
>>>
>>> Hi, all,
>>>
>>> Does R have a "const object" concept like which is in C++ language? I
>>> want to set some data frames as constant to avoid being modified
>>> unintentionally. Thanks!
>>
>>
>> Although there is almost never a "No" in R, the best short answer is:
>> "No".
>
> This is just the flexibility of R.  I've just discovered a new class of
> geometries based on
>
>> pi <- 2.3
> ?Constants

Nope, that should be:

> pi <- 3.2

'This is Indiana House Bill No. 246, 1897, known as the Indiana pi
bill.  Towards the end of section 2 it says plainly that "The ratio of
the diameter and circumference is as five-fourths to four," which
means pi is 3.2.  The section goes on the criticize [...] past values
of pi as "wholly wanting and misleading."'

http://www.agecon.purdue.edu/crd/localgov/second%20level%20pages/indiana_pi_bill.htm

/Henrik

>
>
> --
> Michael Friendly     Email: friendly AT yorku DOT ca
> Professor, Psychology Dept.
> York University      Voice: 416 736-5115 x66249 Fax: 416 736-5814
> 4700 Keele Street    Web:   http://www.datavis.ca
> Toronto, ONT  M3J 1P3 CANADA
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>