Hi r-help-boun...@r-project.org napsal dne 02.02.2010 21:32:16:
> > ke te pehea koe Peter? > I don't see how I could do this with a merge to be honest... > mat<-matrix(sample(letters[1:3], 24, replace=T),6,4) > mat [,1] [,2] [,3] [,4] [1,] "b" "c" "b" "c" [2,] "b" "a" "a" "c" [3,] "c" "b" "c" "a" [4,] "b" "b" "a" "a" [5,] "a" "a" "a" "a" [6,] "a" "c" "b" "c" > mat2<-matrix(sample(letters[1:5], 24, replace=T),6,4) > mat2 [,1] [,2] [,3] [,4] [1,] "c" "a" "d" "c" [2,] "c" "b" "c" "b" [3,] "c" "c" "a" "d" [4,] "c" "b" "d" "c" [5,] "e" "c" "c" "e" [6,] "a" "b" "d" "c" > df1<-data.frame(mat) > df2<-data.frame(mat2) > merge(df1, df2, all=T) X1 X2 X3 X4 1 a a a a 2 a b d c 3 a c b c 4 b a a c 5 b b a a 6 b c b c 7 c a d c 8 c b c a 9 c b c b 10 c b d c 11 c c a d 12 e c c e > merge(df1, df2, by=c("X1", "X2"), all=T) X1 X2 X3.x X4.x X3.y X4.y 1 a a a a <NA> <NA> 2 a b <NA> <NA> d c 3 a c b c <NA> <NA> 4 b a a c <NA> <NA> 5 b b a a <NA> <NA> 6 b c b c <NA> <NA> 7 c a <NA> <NA> d c 8 c b c a c b 9 c b c a d c 10 c c <NA> <NA> a d 11 e c <NA> <NA> c e Is this what you want? Regards Petr > > ----- > Anna Lippel > -- > View this message in context: http://n4.nabble.com/Build-a-matrix-from- > another-matrix-by-specifying-the-indexes-tp1460326p1460355.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.