hi, when I used cbind to combine columns, some contents of columns has been replaced by number. in the script below, column should be aaa,bbb,ccc but I was given 1,2,3. but when I change the column to vector, it gave me correct contents. can you please tell me why? > d<-read.table("aaa.txt") > d V1 V2 1 aaa 123 2 bbb 345 3 ccc 986 > cbind(d[,1],d[,2]) [,1] [,2] [1,] 1 123 [2,] 2 345 [3,] 3 986 > cbind(as.vector(d[,1]),d[,2]) [,1] [,2] [1,] "aaa" "123" [2,] "bbb" "345" [3,] "ccc" "986" >
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