[R] Is there a function to test if all the elements in a vector are unique

[Rolf Turner]

On 2/12/2009, at 3:48 PM, Peng Yu wrote:

> On Tue, Dec 1, 2009 at 8:24 PM, Rolf Turner  
> <r.turner at auckland.ac.nz> wrote:
>>
>> On 2/12/2009, at 3:09 PM, Peng Yu wrote:
>>
>>        <SNIP>
>>
>>> Here is my sessionInfo().
>>
>>        [Snotty comment deleted.]
>>
>>>> sessionInfo()
>>>
>>> R version 2.7.1 (2008-06-23)
>>
>>        <SNIP>
>>
>>        If you're going to use a version which is that antiquated
>>        then you can expect a great many things not to work.
>>
>>        Version 2.10.1 is about to be released, for crying out loud!
>
> Are are package installations backward compatible?

	Mostly.

> Will R code that works in order installations work in the new  
> installations?

	Mostly.

	R-core go to a great deal of effort to make new releases backward
	compatible and to make sure that old code doesn't get broken.
	Sometimes, however, there's just no help for it, and things get
	broken.  Usually there are plenty of warnings in the ``news'',
	and the breaks can of course always be fixed.  This is R, after all.

		cheers,

			Rolf Turner

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