On Mar 16, 2011, at 8:13 AM, Sarah Goslee wrote:
read.table() looks at the first five rows when determining how many
columns
there are. If there are more columns in row 7 and you do not specify
that in
the read.table() command directly, they will be wrapped to the next
row.
This was discussed on the list within the last couple weeks.
In addition to Sarah's comments, I also not that you did not include
your code. I don't think it could have been identical to the code I
suggested, which was in turn based on the code you had proposed.
So ... what did you do to get that result?
--
David.
Sarah
On Wed, Mar 16, 2011 at 7:54 AM, Luis Ridao <luri...@gmail.com> wrote:
David,
Thanks for your tip but it seems I'm having problems with the number
of columns R manages to read in. Below it s an example of the data
read in:
inp[1:20,]
V1 V2 V3 V4 V5 V6 V7
V8 V9
1 1.0000 log_fy_coff -1.007600 0.119520 1.0000 NA
NA NA
2 2.0000 log_fy_coff -0.935010 0.112840 0.8896 1.0000
NA NA
3 3.0000 log_fy_coff -0.876260 0.107500 0.8219 0.8847 1.0000
NA NA
4 4.0000 log_fy_coff -0.683090 0.103030 0.7656 0.8143 0.8747
1.0000 NA
5 5.0000 log_fy_coff -0.623500 0.100980 0.7206 0.7636 0.8086
0.8764 1.0000
6 6.0000 log_fy_coff -0.583330 0.098978 0.6819 0.7214 0.7615
0.8150 0.8762
7 1.0000 NA NA NA NA
NA NA
8 7.0000 log_fy_coff -0.676790 0.096608 0.6521 0.6892 0.7254
0.7719 0.8148
9 0.8717 1.0000 NA NA NA NA
NA NA
10 8.0000 log_fy_coff -0.696060 0.093761 0.6297 0.6654 0.6988
0.7405 0.7750
11 0.8116 0.8643 1.000000 NA NA NA
NA NA
12 9.0000 log_fy_coff -0.527060 0.089949 0.6003 0.6347 0.6667
0.7060 0.7367
as you see there are only 9 columns in inp and the rest is read in in
the following row(see row 7)
I just don't understand why this is happening (using fill=T does not
help either)
Best,
Luis
On Tue, Mar 15, 2011 at 5:15 PM, David Winsemius <dwinsem...@comcast.net
> wrote:
On Mar 15, 2011, at 1:11 PM, <rex.dw...@syngenta.com> wrote:
I think you need to read an introduction to R.
For starters, read.table returns its results as a value, which
you are not
saving.
The probable answer to your question:
Read the whole file with read.table, and select columns you need,
e.g.:
tab <- read.table(myfile, skip=2)[,1:5]
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org
]
On Behalf Of Luis Ridao
Sent: Tuesday, March 15, 2011 11:53 AM
To: r-help@r-project.org
Subject: [R] How to read only specified columns from a data file
R-help,
I'm trying to read a data file with plenty of columns.
I just need the first 5 but it doe not work by doing something
like:
mycols <- rep(NULL, 430) ; mycols[c(1:4)] <- NA
read.table(myfile, skip=2, colClasses=mycols)
I would have suggested:
mycols <- rep(NULL, 430) ; mycols[1:5] <- rep("numeric", 5)
inp <- read.table(myfile, skip=2, colClasses=mycols)
head(inp)
--
David.
Any suggestions?
--
Sarah Goslee
http://www.functionaldiversity.org
______________________________________________
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.
David Winsemius, MD
West Hartford, CT
______________________________________________
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.
