Hi
[email protected] napsal dne 24.06.2009 14:16:15:
> Hello
>
> I have a data frame d with columns "var1", "var2", "var3"
>
> Then I have two vectors:
> columns <- c("var2", "var3")
> values <- c(0, 1)
>
>
> Is there a compact way to subset the data frame
> using these two vectors and get the result equivalent to:
>
> select (d, var2==0 & var3==1) ?
The first part, to select columns seems to be straightforward
d[,columns]
the second part is a bit trickier e.g.
ind = which(rowSums(mapply("%in%", d[,columns], values))>1)
d[ind, columns]
shall give you the result
Regards
Petr
>
> Thank You
>
> Blazej
>
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