I think the issue is that cbind applied to a vector or matrix drops
classes.
It seems that data.frame() should have been used to combine columns here.
On Mon, 25 Aug 2008, Charles Plessy wrote:
Le Sun, Aug 24, 2008 at 10:56:43PM -0700, Yuan Jian a écrit :
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when I used cbind to combine columns, some contents of columns has been
replaced by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")
Hello,
read.table converts characters to factors. Factors will be converted
to numbers by cbind, as in the following example:
toto <- c("aaa","bbb","aaa")
toto
[1] "aaa" "bbb" "aaa"
as.factor(toto)
[1] aaa bbb aaa
Levels: aaa bbb
cbind(as.factor(toto))
[,1]
[1,] 1
[2,] 2
[3,] 1
The 'as.is' or 'colClasses' option of read.table will help you to
prevent the conversion of characters to factors.
Have a nice day,
--
Charles Plessy
http://charles.plessy.org
Tsurumi, Kanagawa, Japan
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Brian D. Ripley, [EMAIL PROTECTED]
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