[R] Simple Model in R

[Rui Barradas]

Hello,

It will not change the value automatically, you will have to rerun the code.

Rui Barradas

Em 07-09-2013 11:52, Ankur Seth escreveu:
> Thanks Rui, but this does not change the value in the new column
> automatically if I change the value in the data column. Any ideas?
>
> Regards,
> Ankur Seth
>
>
> On Sat, Sep 7, 2013 at 2:11 PM, Rui Barradas <ruipbarradas at sapo.pt> wrote:
>
>> Hello,
>>
>> Try the following.
>>
>> dat <- read.table(text = "
>>
>> Date                                Value
>> 08/01/2013                        100
>> 08/02/2013                         100.5
>> 08/03/2013                         102
>> ", header = TRUE)
>>
>>
>> dat$New <- c(NA, diff(dat$Value))
>> dat
>>
>>
>> Hope this helps,
>>
>> Rui Barradas
>>
>> Em 07-09-2013 06:06, Ankur Seth escreveu:
>>
>>> Hello All,
>>>
>>> I am trying to build a model in R. I am facing the following problem...
>>>
>>> My Data Frame contains the following data...
>>>
>>> Date                                Value
>>> 08/01/2013                        100
>>> 08/02/2013                         100.5
>>> 08/03/2013                         102
>>> ....
>>>
>>> Now I want to add a column to this data frame where New Column Value =
>>> Difference of two subsequent observations. For Eg. on 08/02/2013 the new
>>> value = 100.5 - 100=0.5
>>>
>>> I want to do this dynamically such that if I change the value in Value
>>> column the new column should recalculate automatically.
>>>
>>> Is there a way to do this in R?
>>>
>>> Regards,
>>> Ankur Seth
>>>
>>>          [[alternative HTML version deleted]]
>>>
>>> ______________________________**________________
>>> R-help at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/**listinfo/r-help<https://stat.ethz.ch/mailman/listinfo/r-help>
>>> PLEASE do read the posting guide http://www.R-project.org/**
>>> posting-guide.html <http://www.R-project.org/posting-guide.html>
>>> and provide commented, minimal, self-contained, reproducible code.
>>>
>>>
>
>