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Doran, Harold

2006-Aug-16 18:43 UTC

[R] read.csv issue

I'm trying to read in some data from a .csv format and have come across
the following issue. Here is a simple example for replication

# A sample .csv format
schid,sch_name
331-802-7081,School One
464-551-7357,School Two
388-517-7627,School Three \& Four
388-517-4394,School Five

Note the third line includes the \ character. However, when I read the
data in I get
> read.csv(file.choose())         schid              sch_name
1 331-802-7081            School One
2 464-551-7357            School Two
3 388-517-7627 School Three & Four
4 388-517-4394           School Five

It turns out to be very important to read in this character as I have a
program that loops through a data set and Sweave's about 30,000 files.
The variable sch_name gets dropped into the tex file using
\Sexpr{tmp$sch_name}. However, if there is an &, the latex file won't
compile properly. So, what I need is for the data to be read in as

         schid              sch_name
1 331-802-7081            School One
2 464-551-7357            School Two
3 388-517-7627 School Three \& Four
4 388-517-4394           School Five

I am obligated by a client to include the & in the school name, so
eliminating that isn't an option. I thought maybe comment.char or quote
would be what I needed, but they didn't resolve the issue. I'm certain
I'm missing something simple, I just can't see it.

Any thoughts?

Harold



	[[alternative HTML version deleted]]

Carlos J. Gil Bellosta

2006-Aug-16 19:02 UTC

head link

[R] read.csv issue

Dear Harold,

One thing you can do is to read the file "plainly", even if the
"\" is
lost and then, inside R, change the string value with gsub.

Sincerely,

Carlos J. Gil Bellosta

http://www.datanalytics.com
http://www.data-mining-blog.com


El mi?, 16-08-2006 a las 14:43 -0400, Doran, Harold
escribi?:> I'm trying to read in some data from a .csv format and have come across
> the following issue. Here is a simple example for replication
> 
> # A sample .csv format
> schid,sch_name
> 331-802-7081,School One
> 464-551-7357,School Two
> 388-517-7627,School Three \& Four
> 388-517-4394,School Five
> 
> Note the third line includes the \ character. However, when I read the
> data in I get
> 
> > read.csv(file.choose())
>          schid              sch_name
> 1 331-802-7081            School One
> 2 464-551-7357            School Two
> 3 388-517-7627 School Three & Four
> 4 388-517-4394           School Five
> 
> It turns out to be very important to read in this character as I have a
> program that loops through a data set and Sweave's about 30,000 files.
> The variable sch_name gets dropped into the tex file using
> \Sexpr{tmp$sch_name}. However, if there is an &, the latex file
won't
> compile properly. So, what I need is for the data to be read in as
> 
>          schid              sch_name
> 1 331-802-7081            School One
> 2 464-551-7357            School Two
> 3 388-517-7627 School Three \& Four
> 4 388-517-4394           School Five
> 
> I am obligated by a client to include the & in the school name, so
> eliminating that isn't an option. I thought maybe comment.char or quote
> would be what I needed, but they didn't resolve the issue. I'm
certain
> I'm missing something simple, I just can't see it.
> 
> Any thoughts?
> 
> Harold
> 
> 
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at stat.math.ethz.ch 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.

jim holtman

2006-Aug-16 19:09 UTC

head link

[R] read.csv issue

Try 'gsub'
> y         schid            sch_name
1 331-802-7081          School One
2 464-551-7357          School Two
3 388-517-7627 School Three & Four
4 388-517-4394         School Five
> levels(y$sch_name) <- gsub("&", "\\\\&",
levels(y$sch_name))
> y         schid              sch_name
1 331-802-7081            School One
2 464-551-7357            School Two
3 388-517-7627 School Three \\& Four
4 388-517-4394           School Five>


On 8/16/06, Doran, Harold <HDoran@air.org> wrote:>
> I'm trying to read in some data from a .csv format and have come across
> the following issue. Here is a simple example for replication
>
> # A sample .csv format
> schid,sch_name
> 331-802-7081,School One
> 464-551-7357,School Two
> 388-517-7627,School Three \& Four
> 388-517-4394,School Five
>
> Note the third line includes the \ character. However, when I read the
> data in I get
>
> > read.csv(file.choose())
>         schid              sch_name
> 1 331-802-7081            School One
> 2 464-551-7357            School Two
> 3 388-517-7627 School Three & Four
> 4 388-517-4394           School Five
>
> It turns out to be very important to read in this character as I have a
> program that loops through a data set and Sweave's about 30,000 files.
> The variable sch_name gets dropped into the tex file using
> \Sexpr{tmp$sch_name}. However, if there is an &, the latex file
won't
> compile properly. So, what I need is for the data to be read in as
>
>         schid              sch_name
> 1 331-802-7081            School One
> 2 464-551-7357            School Two
> 3 388-517-7627 School Three \& Four
> 4 388-517-4394           School Five
>
> I am obligated by a client to include the & in the school name, so
> eliminating that isn't an option. I thought maybe comment.char or quote
> would be what I needed, but they didn't resolve the issue. I'm
certain
> I'm missing something simple, I just can't see it.
>
> Any thoughts?
>
> Harold
>
>
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@stat.math.ethz.ch 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.
>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?

	[[alternative HTML version deleted]]

Marc Schwartz (via MN)

2006-Aug-16 19:10 UTC

head link

[R] read.csv issue

On Wed, 2006-08-16 at 14:43 -0400, Doran, Harold wrote:> I'm trying to read in some data from a .csv format and have come across
> the following issue. Here is a simple example for replication
> 
> # A sample .csv format
> schid,sch_name
> 331-802-7081,School One
> 464-551-7357,School Two
> 388-517-7627,School Three \& Four
> 388-517-4394,School Five
> 
> Note the third line includes the \ character. However, when I read the
> data in I get
> 
> > read.csv(file.choose())
>          schid              sch_name
> 1 331-802-7081            School One
> 2 464-551-7357            School Two
> 3 388-517-7627 School Three & Four
> 4 388-517-4394           School Five
> 
> It turns out to be very important to read in this character as I have a
> program that loops through a data set and Sweave's about 30,000 files.
> The variable sch_name gets dropped into the tex file using
> \Sexpr{tmp$sch_name}. However, if there is an &, the latex file
won't
> compile properly. So, what I need is for the data to be read in as
> 
>          schid              sch_name
> 1 331-802-7081            School One
> 2 464-551-7357            School Two
> 3 388-517-7627 School Three \& Four
> 4 388-517-4394           School Five
> 
> I am obligated by a client to include the & in the school name, so
> eliminating that isn't an option. I thought maybe comment.char or quote
> would be what I needed, but they didn't resolve the issue. I'm
certain
> I'm missing something simple, I just can't see it.
> 
> Any thoughts?
> 
> Harold
Harold,

What version of R and OS are you running?

Under:

 Version 2.3.1 Patched (2006-08-06 r38829)

 on FC5:
> read.csv("test.csv")         schid              sch_name
1 331-802-7081            School One
2 464-551-7357            School Two
3 388-517-7627 School Three \\& Four
4 388-517-4394           School Five

The '\' is doubled.

Take note of the impact of the 'allowEscapes' argument:
> read.csv("test.csv", allowEscapes = TRUE)         schid            sch_name
1 331-802-7081          School One
2 464-551-7357          School Two
3 388-517-7627 School Three & Four
4 388-517-4394         School Five

The '\' is lost.

Try it with 'allowEscapes = FALSE' explicitly.

HTH,

Marc Schwartz

Doran, Harold

2006-Aug-16 19:15 UTC

head link

[R] read.csv issue

OK, thanks to you and Carlos. I see how this works. Now, I just want 1
"\" (miktex doesn't work with \\). I tried tinkering around with
what
you have for the replacement portion of the function. Is it possible to
only have only one \?


________________________________

	From: jim holtman [mailto:jholtman@gmail.com] 
	Sent: Wednesday, August 16, 2006 3:10 PM
	To: Doran, Harold
	Cc: r-help@stat.math.ethz.ch
	Subject: Re: [R] read.csv issue
	
	
	Try 'gsub'
	 
	> y
	         schid            sch_name
	1 331-802-7081          School One
	2 464-551-7357          School Two
	3 388-517-7627 School Three & Four
	4 388-517-4394         School Five
	
	> levels(y$sch_name) <- gsub("&", " \\\\&",
levels(y$sch_name))
	> y
	         schid              sch_name
	1 331-802-7081            School One
	2 464-551-7357            School Two
	3 388-517-7627 School Three \\& Four
	4 388-517-4394           School Five
	> 
	
	
	 
	On 8/16/06, Doran, Harold <HDoran@air.org> wrote: 

		I'm trying to read in some data from a .csv format and
have come across
		the following issue. Here is a simple example for
replication 
		
		# A sample .csv format
		schid,sch_name
		331-802-7081,School One
		464-551-7357,School Two
		388-517-7627,School Three \& Four
		388-517-4394,School Five
		
		Note the third line includes the \ character. However,
when I read the 
		data in I get
		
		> read.csv(file.choose())
		        schid              sch_name
		1 331-802-7081            School One
		2 464-551-7357            School Two
		3 388-517-7627 School Three & Four
		4 388-517-4394           School Five 
		
		It turns out to be very important to read in this
character as I have a
		program that loops through a data set and Sweave's about
30,000 files.
		The variable sch_name gets dropped into the tex file
using
		\Sexpr{tmp$sch_name}. However, if there is an &, the
latex file won't 
		compile properly. So, what I need is for the data to be
read in as
		
		        schid              sch_name
		1 331-802-7081            School One
		2 464-551-7357            School Two
		3 388-517-7627 School Three \& Four 
		4 388-517-4394           School Five
		
		I am obligated by a client to include the & in the
school name, so
		eliminating that isn't an option. I thought maybe
comment.char or quote
		would be what I needed, but they didn't resolve the
issue. I'm certain 
		I'm missing something simple, I just can't see it.
		
		Any thoughts?
		
		Harold
		
		
		
		       [[alternative HTML version deleted]]
		
		______________________________________________
		R-help@stat.math.ethz.ch 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.
		




	-- 
	Jim Holtman
	Cincinnati, OH
	+1 513 646 9390
	
	What is the problem you are trying to solve? 


	[[alternative HTML version deleted]]

Prof Brian Ripley

2006-Aug-16 19:23 UTC

head link

[R] read.csv issue

Set allowEscapes = FALSE when reading. See the help page for more details.

There is perhaps an argument for changing the default for allowEscapes 
under read.csv, especially as people have now changed that for 
comment.char (in R-devel).

On Wed, 16 Aug 2006, Doran, Harold wrote:
> I'm trying to read in some data from a .csv format and have come across
> the following issue. Here is a simple example for replication
> 
> # A sample .csv format
> schid,sch_name
> 331-802-7081,School One
> 464-551-7357,School Two
> 388-517-7627,School Three \& Four
> 388-517-4394,School Five
> 
> Note the third line includes the \ character. However, when I read the
> data in I get
> 
> > read.csv(file.choose())
>          schid              sch_name
> 1 331-802-7081            School One
> 2 464-551-7357            School Two
> 3 388-517-7627 School Three & Four
> 4 388-517-4394           School Five
> 
> It turns out to be very important to read in this character as I have a
> program that loops through a data set and Sweave's about 30,000 files.
> The variable sch_name gets dropped into the tex file using
> \Sexpr{tmp$sch_name}. However, if there is an &, the latex file
won't
> compile properly. So, what I need is for the data to be read in as
> 
>          schid              sch_name
> 1 331-802-7081            School One
> 2 464-551-7357            School Two
> 3 388-517-7627 School Three \& Four
> 4 388-517-4394           School Five
> 
> I am obligated by a client to include the & in the school name, so
> eliminating that isn't an option. I thought maybe comment.char or quote
> would be what I needed, but they didn't resolve the issue. I'm
certain
> I'm missing something simple, I just can't see it.
> 
> Any thoughts?
> 
> Harold
> 
> 
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at stat.math.ethz.ch 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.
> 
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

Doran, Harold

2006-Aug-16 19:27 UTC

head link

[R] read.csv issue

Well, for this particular program I am using 2.1.1, though I normally
use 2.3.0. Long story about why the old version is used, but I must for
this particular program. 
> -----Original Message-----
> From: Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk] 
> Sent: Wednesday, August 16, 2006 3:26 PM
> To: Doran, Harold
> Cc: r-help at stat.math.ethz.ch
> Subject: Re: [R] read.csv issue
> 
> On Wed, 16 Aug 2006, Prof Brian Ripley wrote:
> 
> > Set allowEscapes = FALSE when reading. See the help page 
> for more details.
> > 
> > There is perhaps an argument for changing the default for 
> allowEscapes 
> > under read.csv, especially as people have now changed that for 
> > comment.char (in R-devel).
> 
> Oops, it was already changed in 2.2.0.  What version of R is this?
> 
> > On Wed, 16 Aug 2006, Doran, Harold wrote:
> > 
> > > I'm trying to read in some data from a .csv format and have
come
> > > across the following issue. Here is a simple example for 
> replication
> > > 
> > > # A sample .csv format
> > > schid,sch_name
> > > 331-802-7081,School One
> > > 464-551-7357,School Two
> > > 388-517-7627,School Three \& Four
> > > 388-517-4394,School Five
> > > 
> > > Note the third line includes the \ character. However, 
> when I read 
> > > the data in I get
> > > 
> > > > read.csv(file.choose())
> > >          schid              sch_name
> > > 1 331-802-7081            School One
> > > 2 464-551-7357            School Two
> > > 3 388-517-7627 School Three & Four
> > > 4 388-517-4394           School Five
> > > 
> > > It turns out to be very important to read in this character as I 
> > > have a program that loops through a data set and Sweave's 
> about 30,000 files.
> > > The variable sch_name gets dropped into the tex file using 
> > > \Sexpr{tmp$sch_name}. However, if there is an &, the latex
file
> > > won't compile properly. So, what I need is for the data 
> to be read 
> > > in as
> > > 
> > >          schid              sch_name
> > > 1 331-802-7081            School One
> > > 2 464-551-7357            School Two
> > > 3 388-517-7627 School Three \& Four
> > > 4 388-517-4394           School Five
> > > 
> > > I am obligated by a client to include the & in the school 
> name, so 
> > > eliminating that isn't an option. I thought maybe
comment.char or
> > > quote would be what I needed, but they didn't resolve the 
> issue. I'm 
> > > certain I'm missing something simple, I just can't see
it.
> > > 
> > > Any thoughts?
> > > 
> > > Harold
> > > 
> > > 
> > > 
> > > 	[[alternative HTML version deleted]]
> > > 
> > > ______________________________________________
> > > R-help at stat.math.ethz.ch 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.
> > > 
> > 
> > 
> 
> -- 
> Brian D. Ripley,                  ripley at stats.ox.ac.uk
> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
> University of Oxford,             Tel:  +44 1865 272861 (self)
> 1 South Parks Road,                     +44 1865 272866 (PA)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
>

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