[R] to extract data

Uwe Ligges ligges at statistik.tu-dortmund.de
Mon Apr 20 09:53:59 CEST 2009



Roslina Zakaria wrote:
> Hi R-users,
> 
> I have a set of data from 1958-2009, how do I extract the data from 1927 and 2007?
>  
> beechworth.dt
>      Year Month  Rain
> 1    1858     3  21.8
> 2    1858     4  47.0
> 3    1858     5  70.1
> 4    1858     6  78.7
> 5    1858     7 101.6
> 6    1858     8 129.8
> 7    1858     9  80.8
> 8    1858    10  41.9
>  ...
>  
>      2009    ......
>  
>  
> I tried:
>  
>  beechworth.dt.2 <- beechworth.dt[beechworth.dt$Year=="1927":"2007",]

You probably want to index with
  beechworth.dt$Year %in% 1927:2007
or
  beechworth.dt$Year %in% c(1927, 2007)

(not sure which one given your question "from 1927 and 2007").

Uwe Ligges




>  
> and got
>  
> Warning message:
> In beechworth.dt$Year == "1927":"2007" :
>   longer object length is not a multiple of shorter object length
>  
> Thank you so much for any help given.
> 
> 
> 
> 
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