[R] indexing question

[Benjamin.STABLER@odot.state.or.us]

take a look at match or maybe merge

>-----Original Message-----
>From: Adrian Dusa [mailto:adi at roda.ro]
>Sent: Wednesday, May 19, 2004 8:44 AM
>To: r-help at stat.math.ethz.ch
>Subject: [R] indexing question
>
>
>Hi,
>
>I have a problem and a rather poor solution that I would like 
>to improve.
>There a 2 datasets with different number of cases like this:
>
>Dataset 'poploc'                                Dataset 'siruta'
>
>Case no.     SIRUTA     TYPE                    Case no.     
>SIRUTA     TYPE
>1            1017        0                      1            
>1017        3  
>2            1026        0                      2            
>1020        5
>3            42711       0                      3            
>1026        4
>...                                               ...
>13000        100234      0                      ...
>                                                16000        
>160241      3
>
>I want to bring the TIP variable in the 'poploc' dataset 
>according to the 
>SIRUTA variable (which has unique codes for each case, in both 
>datasests).
>The resulting dataset 'poploc' should look like this:
>
>Case no.     SIRUTA     TYPE
>1            1017        3
>2            1026        4
>3            42711       3
>...
>13000        100234      5
>
>My current solution involves a combination of FOR looping and 
>indexing, which 
>takes about 3 minutes to complete.
>
>for (i in 1:nrow(siruta))
>poploc$TIP[poploc$SIRUTA %in% siruta$SIRUTA[i]] <- siruta$TIP[i]
>
>I'm sure there are more clever solutions, any help 
>appreciated. Thank you!
>Adrian
>
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