I believe Wu Gong has given you a solution. As a note you were probably
reading in the first two columns as either factors or characters and the last
one as numeric. You might want to try it again and then do a str() on the
resulting data.frame to see what was happening.
It can be confusing to discover that you have factor rather than character data
in the data.frame. :)
--- On Thu, 8/5/10, karena dr.jz...@gmail.com wrote:
From: karena dr.jz...@gmail.com
Subject: [R] a question about 'read.table' with or without
'read.table'.(urgent)
To: r-help@r-project.org
Received: Thursday, August 5, 2010, 12:32 AM
Hi, I've got a quite tricky question.
I have a txt file, named 'temp.txt', as the following:
snp1 snp2
snp3
AA 00
00
GG GG
00
00 AA
00
I want to read the file into R.
1) when I use 'read.table' without 'header=T' option,
temp - read.table('temp.txt')
# I got
temp
V1 V2 V3
1 snp1 snp2 snp3
2 AA 00 00
3 GG GG 00
4 00 AA 00
2) If I include the 'header=T' option,
temp - read.table('temp.txt', header=T, as.is=T)
# I got
temp
snp1 snp2 snp3
1 AA 00 0
2 GG GG 0
3 00 AA 0
The difference is for 'snp3', we can see, in 1) the values
for snp3 are all
'00', while in 2) the values are all '0'.
How can I keep the original
values for snp3 as '00', meanwhile get the 'headers' or say
the colnames as
'snp1 snp2
snp3'?
thank you very much,
karena
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