[R] R loop

[Uwe Ligges]

Petr Pikal wrote:

> Hi
> 
> On 6 Feb 2006 at 15:57, ivo welch wrote:
> 
> Date sent:      	Mon, 6 Feb 2006 15:57:30 -0500
> From:           	ivo welch <ivowel at gmail.com>
> To:             	Sean Davis <sdavis2 at mail.nih.gov>
> Copies to:      	piet.vanremortel at gmail.com, r-help <r-help at stat.math.ethz.ch>
> Subject:        	Re: [R] R loop
> 
> 
>>>>data[ data$a == "name2" ]  # does not work and gives a weird
>>>>result,  yuck
>>>
>>> data[data$a=="name2",]
>>>
>>
>>sorry about this.  I believe a few versions back, one could not subset
>>data frames, so I did not even check what I wrote.  Works now.
> 
> 
> It depends on what you consider few versions back. I started with R 
> vesion 1.2.0 about 10 years 

I bet 200$ (or EUR) you have not used R 10 years ago. ;-)

People certainly remember the 1.0.0 release at the remarkable day 
29-FEB-2000.
1.2.0 was released in December 2000, about 5 years ago.
I started with 0.62.x in 1998.
The oldest version I found on CRAN is a pre-alpha R.sea.hqx for the Mac 
               dated 07-Nov-1996.


Uwe Ligges





> ago and I believe that data frame 
> subsetting was done in **very** similar manner as it is performed 
> now.
> 
> Cheers
> Petr
> 
> 
>>>Look at ?order.
>>
>>I know.  This is why I suggested only that we need a wrapper that
>>plugs an order() functionality into the sort() function (which
>>fortunately points in its docs to order)---but novices would find the
>>sort syntax easier.
>>
>>regards,
>>
>>/iaw
>>
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> 
> 
> Petr Pikal
> petr.pikal at precheza.cz
> 
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