What if more generally that the group name doest have anything to do with
the ID, eg. for ID=AL1 and AL2, I want to name the group as "Key1", how can
I approach that?

Thanks,


On Thu, Apr 11, 2013 at 11:54 AM, Rui Barradas <ruipbarradas@sapo.pt> wrote:

> Hello,
>
> Try the following.
>
>
> dat <- read.table(text = "
>
> ID  Value
> AL1  1
> AL2  2
> CA1  3
> CA4  4
> ", header = TRUE, stringsAsFactors = FALSE)
>
> dat$State <- substr(dat$ID, 1, 2)
>
>
> Note that this dependes on having State being defined by the first two
> characters of ID.
>
> Hope this helps,
>
> Rui Barradas
>
>
> Em 11-04-2013 19:37, Ye Lin escreveu:
>
>> Hey,
>>
>> I have a dataset and I want to identify the records by groups for further
>> use in ggplot.
>>
>> Here is a sample data:
>>
>> ID  Value
>> AL1  1
>> AL2  2
>> CA1  3
>> CA4  4
>>
>> I want to identify all the records that in the same state (AL1 AND A2),
>> group them as "AL", and do the same for CA1 and CA4. How can I have an
>> output like:
>>
>> ID  Value State
>> AL1  1       AL
>> AL2  2      AL
>> CA1  3      CA
>> CA4  4     CA
>>
>> Thanks for your help!
>>
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>>
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>>
>>

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