Then perhaps your example should illustrate one of these "many situations" that
trouble you but you are not being clear about.
--
Sent from my phone. Please excuse my brevity.
On May 31, 2016 11:39:04 AM PDT, Santosh <santosh2...@gmail.com> wrote:
>I agree that performing merge outside the scope of "within" function,
>is
>pretty straight forward.. At times there are situations when many, if
>not
>all, of the operations are needed to be done within the scope the
>"within"
>environment..
>
>Thanks so much..
>Regards,
>Santosh
>
>On Tue, May 31, 2016 at 11:29 AM, Jeff Newmiller
><jdnew...@dcn.davis.ca.us>
>wrote:
>
>> What is complicated about merge( q, r )?
>>
>> Keep in mind that there is nothing simple about the rules for
>non-standard
>> evaluation of variables that within() uses, and it only gets more
>> complicated if you try to apply those rules to two data frames at
>once.
>> While I am not quite sure I understand what you really want, I
>suspect you
>> won't like the behavior you get when you pile too much context into
>> within().
>>
>> Note that dplyr::inner_join, which is designed to fit into a whole
>> ecosystem of NSE functions, uses strings to specify column names to
>join by
>> just like the merge "by" parameters do rather than using NSE, because
>it is
>> actually the least confusing approach when two data frames are being
>> referenced.
>> --
>> Sent from my phone. Please excuse my brevity.
>>
>> On May 31, 2016 10:50:24 AM PDT, Santosh <santosh2...@gmail.com>
>wrote:
>>>
>>> Thanks for response.. I want to merge two data frames using "within"
>>> function..the columns to used for merge could vary.. then the other
>>> commands become simpler..
>>>
>>> Thanks so much for your help!
>>> Santosh
>>>
>>> On Sat, May 28, 2016 at 1:53 PM, Duncan Murdoch
><murdoch.dun...@gmail.com>
>>> wrote:
>>>
>>> On 27/05/2016 7:00 PM, Santosh wrote:
>>>>
>>>> Dear Rxperts!
>>>>>
>>>>> Is there a way to compute relative values.. using within()..
>function?
>>>>>
>>>>> Any assistance/suggestions are highly welcome!!
>>>>> Thanks again,
>>>>> Santosh...
>>>>> ------------------------------
>>>>>
>>>>> A sample dataset and the computation "outside" within() function
>is
>>>>> shown..
>>>>>
>>>>> q <- data.frame(GL =
>>>>> rep(paste("G",1:3,sep = ""),each = 50),
>>>>> G = rep(1:3,each = 50),
>>>>> D = rep(paste("D",1:5,sep = ""),each = 30),
>>>>> a = rep(1:15,each = 10),
>>>>> t = rep(seq(10),15),
>>>>> b = round(runif(150,10,20)))
>>>>> r <- subset(q,!duplicated(paste(G,a)),sel=c(G,a,b))
>>>>> names(r)[3] <- "bl"
>>>>> s <- merge(q,r)
>>>>> s$db <- s$b-s$bl
>>>>>
>>>>> head(s,5)
>>>>>
>>>>>>
>>>>>> G a GL D t b bl db
>>>>> 1 1 1 G1 D1 1 13 13 0
>>>>> 2 1 1 G1 D1 2 16 13 3
>>>>> 3 1 1 G1 D1 3 19 13 6
>>>>> 4 1 1 G1 D1 4 12 13 -1
>>>>> 5 1 1 G1 D1 5 19 13 6
>>>>
>>>>
>>>>
>>>> Just use
>>>>
>>>> s <- within(s, db <- b - bl)
>>>>
>>>> Duncan Murdoch
>>>
>>>
>>>
>>>
>>> [[alternative HTML version deleted]]
>>>
>>> ------------------------------
>>>
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>>>
>>>
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