[R] correct subset in R

[Rui Barradas]

Hello,

I would try ?merge, in particular see the arguments by.x and by.y

Hope this helps,

Rui Barradas

Em 23-03-2017 18:19, Elahe chalabi via R-help escreveu:
> Hi all,
> I found an answer to the last question I asked in this group and now I want to have a correct subset of my data:
>
> I have a following df1 which is list of all cities in US and their states:
>
> $ name         : Factor w/ 1008 levels "Ackley","Ackworth",..: 1 2 3
> $ state        : Factor w/ 1 level "Iowa": 1 1 1 1 1 1 1 1 1 1 .
>
> the other data frame I have is df2 which is the list of cities I have and I want to get their state from df1:
>
> $ cities : Factor w/ 547 levels "Afton","Boone","Calmar",...: 1 2 3
>
>
> now how should I subset in a way to get related states of $cities from df1?
>
> Thanks for any help!
> Elahe
>
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