Hello,
I have a data.frame with a column that I would like to split into based
around the delimiter ":". This is a useful feature in Excel. I cannot
work out the best way to do it in R. I am sure you need to use
strsplit, but that returns a list. The problem is that some values in
the column do not contain a ":" so should have a "NA" in the second
column of the result, and this makes doing an unlist a non-starter.
Any ideas?
Many thanks
Daniel Brewer
The Institute of Cancer Research: Royal Cancer Hospital, a charitable Company Limited by Guarantee, Registered in England under Company No. 534147 with its Registered Office at 123 Old Brompton Road, London SW7 3RP.
This e-mail message is confidential and for use by the a...{{dropped:2}}
Best way to strsplit a column
3 messages · Daniel Brewer, Dimitris Rizopoulos, Gabor Grothendieck
try the following:
strg <- c("123:abc", "qwe:789f", "abcde", "a:fd", "567")
sapply(strsplit(strg, ":"), function(x){
if (length(x) == 1) x <- c(x, NA)
x
})
I hope it helps.
Best,
Dimitris
----
Dimitris Rizopoulos
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
http://www.student.kuleuven.be/~m0390867/dimitris.htm
----- Original Message -----
From: "Daniel Brewer" <daniel.brewer at icr.ac.uk>
To: <r-help at stat.math.ethz.ch>
Sent: Tuesday, March 04, 2008 2:54 PM
Subject: [R] Best way to strsplit a column
Hello,
I have a data.frame with a column that I would like to split into
based
around the delimiter ":". This is a useful feature in Excel. I
cannot
work out the best way to do it in R. I am sure you need to use
strsplit, but that returns a list. The problem is that some values
in
the column do not contain a ":" so should have a "NA" in the second
column of the result, and this makes doing an unlist a non-starter.
Any ideas?
Many thanks
Daniel Brewer
The Institute of Cancer Research: Royal Cancer Hospital, a
charitable Company Limited by Guarantee, Registered in England under
Company No. 534147 with its Registered Office at 123 Old Brompton
Road, London SW7 3RP.
This e-mail message is confidential and for use by the...{{dropped:14}}
Or using the same strg as below: read.table(textConnection(strg), sep = ":", fill = TRUE, as.is = TRUE, na.strings = "") On Tue, Mar 4, 2008 at 9:06 AM, Dimitris Rizopoulos
<dimitris.rizopoulos at med.kuleuven.be> wrote:
try the following:
strg <- c("123:abc", "qwe:789f", "abcde", "a:fd", "567")
sapply(strsplit(strg, ":"), function(x){
if (length(x) == 1) x <- c(x, NA)
x
})
I hope it helps.
Best,
Dimitris
----
Dimitris Rizopoulos
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
http://www.student.kuleuven.be/~m0390867/dimitris.htm
----- Original Message -----
From: "Daniel Brewer" <daniel.brewer at icr.ac.uk>
To: <r-help at stat.math.ethz.ch>
Sent: Tuesday, March 04, 2008 2:54 PM
Subject: [R] Best way to strsplit a column
Hello,
I have a data.frame with a column that I would like to split into
based
around the delimiter ":". This is a useful feature in Excel. I
cannot
work out the best way to do it in R. I am sure you need to use
strsplit, but that returns a list. The problem is that some values
in
the column do not contain a ":" so should have a "NA" in the second
column of the result, and this makes doing an unlist a non-starter.
Any ideas?
Many thanks
Daniel Brewer
The Institute of Cancer Research: Royal Cancer Hospital, a
charitable Company Limited by Guarantee, Registered in England under
Company No. 534147 with its Registered Office at 123 Old Brompton
Road, London SW7 3RP.
This e-mail message is confidential and for use by the...{{dropped:14}}
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