probably you're looking for
subset(capdist, ida %in% c("DEN","SWD","FIN") & idb %in%
c("DEN","SWD","FIN"))
I hope it helps.
Best,
Dimitris
Thomas Jensen wrote:
Dear R-list,
I am having troubles selecting rows from a very large data-set
containing distances between capitals.
The structure of the data-set looks like this:
numa ida numb idb kmdist midist
1 2 USA 20 CAN 731 456
2 2 USA 31 BHM 1623 1012
3 2 USA 40 CUB 1813 1130
I want to select a subset of these dyads, and have tried the following
code:
subset(capdist,ida == c("DEN","SWD","FIN") & idb ==
c("DEN","SWD","FIN"))
This should ideally give me the dyads involving only Denmark, Sweden
and Finland, however i get the error message:
[1] numa ida numb idb kmdist midist
<0 rows> (or 0-length row.names)
Warning messages:
1: In is.na(e1) | is.na(e2) :
longer object length is not a multiple of shorter object length
2: In `==.default`(ida, c("DEN", "SWD", "FIN")) :
longer object length is not a multiple of shorter object length
3: In is.na(e1) | is.na(e2) :
longer object length is not a multiple of shorter object length
4: In `==.default`(idb, c("DEN", "SWD", "FIN")) :
longer object length is not a multiple of shorter object length
Any help would be greatly appreciated,
Best, Thomas Jensen
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Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center
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