Re: [R] Looking for simple line-splitting code
Hi,
using the library "stringi" allows this:
> unlist(stringr::str_split(x, "\n"))
[1] "abc" "def" """ghi"
Best,
Kimmo
ke, 2025-02-05 kello 09:35 -0500, Duncan Murdoch kirjoitti:
> Thanks to Rui, Peter and Tanvir! Peter's seems to be the fastest of
> the
> 3 suggestions so far on the little test case, but on the real data
> (where x contains several thousand lines), Rui's seems best.
>
> Duncan
>
> On 2025-02-05 9:13 a.m., peter dalgaard wrote:
> > This also seems to work:
> >
> > > strsplit(paste(x,collapse="\n"),"\n")[[1]]
> > [1] "abc" "def" """ghi"
> >
> >
> > > On 5 Feb 2025, at 14:44 , Duncan Murdoch
> > > wrote:
> > >
> > > If I have this object:
> > >
> > > x <- c("abc\ndef", "", "ghi")
> > >
> > > and I write it to a file using `writeLines(x, "test.txt")`, my
> > > text editor sees a 5 line file:
> > >
> > > 1: abc
> > > 2: def
> > > 3:
> > > 4: ghi
> > > 5:
> > >
> > > which is what I'd expect: the last line in the editor is empty.
> > > If I use `readLines("test.txt")` on that file, I get the vector
> > >
> > > c("abc", "def", "", "ghi")
> > >
> > > and all of that is fine.
> > >
> > > What I'm looking for is simple code that modifies x to the
> > > `readLines()` output, without actually writing and reading it.
> > >
> > > My first attempt doesn't work:
> > >
> > > unlist(strsplit(x, "\n"))
> > >
> > > because it leaves out the blank line 3. I can fix that with this
> > > ugly code:
> > >
> > > lines <- strsplit(x, "\n")
> > > lines[sapply(lines, length) == 0] <- list("")
> > > lines <- unlist(lines)
> > >
> > > Surely there's a simpler way to do this? I'd like to use just
> > > base functions, no other packages.
> > >
> > > Duncan Murdoch
> > >
> > > __
> > > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > > https://stat.ethz.ch/mailman/listinfo/r-help
> > > PLEASE do read the posting guide
> > > https://www.r-project.org/posting-guide.html
> > > and provide commented, minimal, self-contained, reproducible
> > > code.
> >
>
> __
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> and provide commented, minimal, self-contained, reproducible code.
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Re: [R] Looking for simple line-splitting code
On 2025-02-05 5:20 p.m., Rolf Turner wrote:
On Wed, 5 Feb 2025 08:44:12 -0500
Duncan Murdoch wrote:
If I have this object:
x <- c("abc\ndef", "", "ghi")
and I write it to a file using `writeLines(x, "test.txt")`, my text
editor sees a 5 line file:
1: abc
2: def
3:
4: ghi
5:
which is what I'd expect: the last line in the editor is empty.If I
use `readLines("test.txt")` on that file, I get the vector
c("abc", "def", "", "ghi")
Apologies for muddying the waters with my ignorance, but why would you
expect a 5 line file? I would expect a 4 line file, and that is
indeed what I get when I try the code in question.
If I append an empty line at the end of my test.txt and then
apply readLines() to that file, I get [1] "abc" "def" """ghi" "",
again as *I* would expect.
What am I missing? Sorry for being a thicko.
That fifth line is more a function of the editor (RStudio) than the
file. The last line ends with a newline. The editor shows this by
including a blank 5th line. If the last line just stopped at the last
letter, the editor would display it as a 4 line file.
Duncan Murdoch
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Re: [R] Looking for simple line-splitting code
Hello,
Inline.
Às 20:27 de 05/02/2025, peter dalgaard escreveu:
A 3rd option could be
scan(text=x, what="", blank.lines.skip=FALSE)
(all because readLines() doesn't obey the text=x convention, perhaps it should?
I'm unsure whether the textConnection is left open in Rui's method.)
No, it is not left open. Use ?showConnections to check it.
x <- c("abc\ndef", "", "ghi")
x |> textConnection() |> readLines()
showConnections()
# this creates and opens a connection
tc <- textConnection(x)
showConnections()
readLines(tc)
showConnections()
close(tc)
showConnections()
Hope this helps,
Rui Barradas
-pd
On 5 Feb 2025, at 15:35 , Duncan Murdoch wrote:
Thanks to Rui, Peter and Tanvir! Peter's seems to be the fastest of the 3
suggestions so far on the little test case, but on the real data (where x
contains several thousand lines), Rui's seems best.
Duncan
On 2025-02-05 9:13 a.m., peter dalgaard wrote:
This also seems to work:
strsplit(paste(x,collapse="\n"),"\n")[[1]]
[1] "abc" "def" """ghi"
On 5 Feb 2025, at 14:44 , Duncan Murdoch wrote:
If I have this object:
x <- c("abc\ndef", "", "ghi")
and I write it to a file using `writeLines(x, "test.txt")`, my text editor sees
a 5 line file:
1: abc
2: def
3:
4: ghi
5:
which is what I'd expect: the last line in the editor is empty. If I use
`readLines("test.txt")` on that file, I get the vector
c("abc", "def", "", "ghi")
and all of that is fine.
What I'm looking for is simple code that modifies x to the `readLines()`
output, without actually writing and reading it.
My first attempt doesn't work:
unlist(strsplit(x, "\n"))
because it leaves out the blank line 3. I can fix that with this ugly code:
lines <- strsplit(x, "\n")
lines[sapply(lines, length) == 0] <- list("")
lines <- unlist(lines)
Surely there's a simpler way to do this? I'd like to use just base functions,
no other packages.
Duncan Murdoch
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Re: [R] Looking for simple line-splitting code
On Wed, 5 Feb 2025 08:44:12 -0500
Duncan Murdoch wrote:
> If I have this object:
>
>x <- c("abc\ndef", "", "ghi")
>
> and I write it to a file using `writeLines(x, "test.txt")`, my text
> editor sees a 5 line file:
>
>1: abc
>2: def
>3:
>4: ghi
>5:
>
> which is what I'd expect: the last line in the editor is empty.If I
> use `readLines("test.txt")` on that file, I get the vector
>
>c("abc", "def", "", "ghi")
Apologies for muddying the waters with my ignorance, but why would you
expect a 5 line file? I would expect a 4 line file, and that is
indeed what I get when I try the code in question.
If I append an empty line at the end of my test.txt and then
apply readLines() to that file, I get [1] "abc" "def" """ghi" "",
again as *I* would expect.
What am I missing? Sorry for being a thicko.
cheers,
Rolf
--
Honorary Research Fellow
Department of Statistics
University of Auckland
Stats. Dep't. (secretaries) phone:readLines("test.txt")
+64-9-373-7599 ext. 89622
Home phone: +64-9-480-4619
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Re: [R] Looking for simple line-splitting code
A 3rd option could be
scan(text=x, what="", blank.lines.skip=FALSE)
(all because readLines() doesn't obey the text=x convention, perhaps it should?
I'm unsure whether the textConnection is left open in Rui's method.)
-pd
> On 5 Feb 2025, at 15:35 , Duncan Murdoch wrote:
>
> Thanks to Rui, Peter and Tanvir! Peter's seems to be the fastest of the 3
> suggestions so far on the little test case, but on the real data (where x
> contains several thousand lines), Rui's seems best.
>
> Duncan
>
> On 2025-02-05 9:13 a.m., peter dalgaard wrote:
>> This also seems to work:
>>> strsplit(paste(x,collapse="\n"),"\n")[[1]]
>> [1] "abc" "def" """ghi"
>>> On 5 Feb 2025, at 14:44 , Duncan Murdoch wrote:
>>>
>>> If I have this object:
>>>
>>> x <- c("abc\ndef", "", "ghi")
>>>
>>> and I write it to a file using `writeLines(x, "test.txt")`, my text editor
>>> sees a 5 line file:
>>>
>>> 1: abc
>>> 2: def
>>> 3:
>>> 4: ghi
>>> 5:
>>>
>>> which is what I'd expect: the last line in the editor is empty. If I use
>>> `readLines("test.txt")` on that file, I get the vector
>>>
>>> c("abc", "def", "", "ghi")
>>>
>>> and all of that is fine.
>>>
>>> What I'm looking for is simple code that modifies x to the `readLines()`
>>> output, without actually writing and reading it.
>>>
>>> My first attempt doesn't work:
>>>
>>> unlist(strsplit(x, "\n"))
>>>
>>> because it leaves out the blank line 3. I can fix that with this ugly code:
>>>
>>> lines <- strsplit(x, "\n")
>>> lines[sapply(lines, length) == 0] <- list("")
>>> lines <- unlist(lines)
>>>
>>> Surely there's a simpler way to do this? I'd like to use just base
>>> functions, no other packages.
>>>
>>> Duncan Murdoch
>>>
>>> __
>>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide
>>> https://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>
--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd@cbs.dk Priv: pda...@gmail.com
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and provide commented, minimal, self-contained, reproducible code.
Re: [R] Looking for simple line-splitting code
Thanks to Rui, Peter and Tanvir! Peter's seems to be the fastest of the
3 suggestions so far on the little test case, but on the real data
(where x contains several thousand lines), Rui's seems best.
Duncan
On 2025-02-05 9:13 a.m., peter dalgaard wrote:
This also seems to work:
strsplit(paste(x,collapse="\n"),"\n")[[1]]
[1] "abc" "def" """ghi"
On 5 Feb 2025, at 14:44 , Duncan Murdoch wrote:
If I have this object:
x <- c("abc\ndef", "", "ghi")
and I write it to a file using `writeLines(x, "test.txt")`, my text editor sees
a 5 line file:
1: abc
2: def
3:
4: ghi
5:
which is what I'd expect: the last line in the editor is empty. If I use
`readLines("test.txt")` on that file, I get the vector
c("abc", "def", "", "ghi")
and all of that is fine.
What I'm looking for is simple code that modifies x to the `readLines()`
output, without actually writing and reading it.
My first attempt doesn't work:
unlist(strsplit(x, "\n"))
because it leaves out the blank line 3. I can fix that with this ugly code:
lines <- strsplit(x, "\n")
lines[sapply(lines, length) == 0] <- list("")
lines <- unlist(lines)
Surely there's a simpler way to do this? I'd like to use just base functions,
no other packages.
Duncan Murdoch
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Re: [R] Looking for simple line-splitting code
x <- c("abc\ndef", "", "ghi")
unlist(strsplit(gsub("^$", "\n", x), "\n"))
or
x %>%
gsub("^$", "\n", .) %>%
strsplit("\n") %>%
unlist()
Regards.
Tanvir Ahamed
Stockholm, Sweden | mashra...@yahoo.com
On Wednesday, February 5, 2025 at 02:44:37 PM GMT+1, Duncan Murdoch
wrote:
If I have this object:
x <- c("abc\ndef", "", "ghi")
and I write it to a file using `writeLines(x, "test.txt")`, my text
editor sees a 5 line file:
1: abc
2: def
3:
4: ghi
5:
which is what I'd expect: the last line in the editor is empty. If I
use `readLines("test.txt")` on that file, I get the vector
c("abc", "def", "", "ghi")
and all of that is fine.
What I'm looking for is simple code that modifies x to the `readLines()`
output, without actually writing and reading it.
My first attempt doesn't work:
unlist(strsplit(x, "\n"))
because it leaves out the blank line 3. I can fix that with this ugly code:
lines <- strsplit(x, "\n")
lines[sapply(lines, length) == 0] <- list("")
lines <- unlist(lines)
Surely there's a simpler way to do this? I'd like to use just base
functions, no other packages.
Duncan Murdoch
__
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and provide commented, minimal, self-contained, reproducible code.
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Re: [R] Looking for simple line-splitting code
This also seems to work:
> strsplit(paste(x,collapse="\n"),"\n")[[1]]
[1] "abc" "def" """ghi"
> On 5 Feb 2025, at 14:44 , Duncan Murdoch wrote:
>
> If I have this object:
>
> x <- c("abc\ndef", "", "ghi")
>
> and I write it to a file using `writeLines(x, "test.txt")`, my text editor
> sees a 5 line file:
>
> 1: abc
> 2: def
> 3:
> 4: ghi
> 5:
>
> which is what I'd expect: the last line in the editor is empty. If I use
> `readLines("test.txt")` on that file, I get the vector
>
> c("abc", "def", "", "ghi")
>
> and all of that is fine.
>
> What I'm looking for is simple code that modifies x to the `readLines()`
> output, without actually writing and reading it.
>
> My first attempt doesn't work:
>
> unlist(strsplit(x, "\n"))
>
> because it leaves out the blank line 3. I can fix that with this ugly code:
>
> lines <- strsplit(x, "\n")
> lines[sapply(lines, length) == 0] <- list("")
> lines <- unlist(lines)
>
> Surely there's a simpler way to do this? I'd like to use just base
> functions, no other packages.
>
> Duncan Murdoch
>
> __
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide https://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd@cbs.dk Priv: pda...@gmail.com
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Re: [R] Looking for simple line-splitting code
Às 13:44 de 05/02/2025, Duncan Murdoch escreveu:
If I have this object:
x <- c("abc\ndef", "", "ghi")
and I write it to a file using `writeLines(x, "test.txt")`, my text
editor sees a 5 line file:
1: abc
2: def
3:
4: ghi
5:
which is what I'd expect: the last line in the editor is empty. If I
use `readLines("test.txt")` on that file, I get the vector
c("abc", "def", "", "ghi")
and all of that is fine.
What I'm looking for is simple code that modifies x to the `readLines()`
output, without actually writing and reading it.
My first attempt doesn't work:
unlist(strsplit(x, "\n"))
because it leaves out the blank line 3. I can fix that with this ugly
code:
lines <- strsplit(x, "\n")
lines[sapply(lines, length) == 0] <- list("")
lines <- unlist(lines)
Surely there's a simpler way to do this? I'd like to use just base
functions, no other packages.
Duncan Murdoch
__
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guide.html
and provide commented, minimal, self-contained, reproducible code.
Hello,
Use ?textConnection.
The 5th line is left out, just like in your code.
x <- c("abc\ndef", "", "ghi")
x |> textConnection() |> readLines()
# [1] "abc" "def" """ghi"
Hope this helps,
Rui Barradas
--
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de vírus.
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[R] Looking for simple line-splitting code
If I have this object:
x <- c("abc\ndef", "", "ghi")
and I write it to a file using `writeLines(x, "test.txt")`, my text
editor sees a 5 line file:
1: abc
2: def
3:
4: ghi
5:
which is what I'd expect: the last line in the editor is empty. If I
use `readLines("test.txt")` on that file, I get the vector
c("abc", "def", "", "ghi")
and all of that is fine.
What I'm looking for is simple code that modifies x to the `readLines()`
output, without actually writing and reading it.
My first attempt doesn't work:
unlist(strsplit(x, "\n"))
because it leaves out the blank line 3. I can fix that with this ugly code:
lines <- strsplit(x, "\n")
lines[sapply(lines, length) == 0] <- list("")
lines <- unlist(lines)
Surely there's a simpler way to do this? I'd like to use just base
functions, no other packages.
Duncan Murdoch
__
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and provide commented, minimal, self-contained, reproducible code.
