Backslash \ in string

Dear R community,


is there any way to include a backslash in a charakter string without meaning some escape sequence?

E.g. i need a string like:

a<- '\hline'
Error: '\h' is an unrecognized escape in character string starting "\h"

to include some latex code in a xtable object, but I only mange to do:

a<- '\\hline'

which is not what I want.

In detail I would like to add the following line of code to the first row of an xtable object with the add.to.row argument:


&  \multicolumn{4}{c}{A} \multicolumn{4}{c}{B} \\

for which I have to convert it into a character sting.

Von: Erik Iverson <eriki at ccbr.umn.edu>
Betreff: Re: [R] Backslash \ in string
An: "Jannis" <bt_jannis at yahoo.de>
CC: r-help at r-project.org
Datum: Donnerstag, 15. Juli, 2010 13:09 Uhr
On 07/15/2010 08:02 AM, Jannis
wrote:

Dear R community,


is there any way to include a backslash in a charakter

string without meaning some escape sequence?

E.g. i need a string like:

a<- '\hline'
Error: '\h' is an unrecognized escape in character

string starting "\h"

to include some latex code in a xtable object, but I

only mange to do:

a<- '\\hline'

which is not what I want.

Why don't you want that?? I use something like that
every day with LaTeX and it 
works fine, so I'm not sure what you mean.? I don't
use xtable though, so I 
can't speak to that.? But can you explain what happens
in the resulting .tex 
file when you use '\\'.? Escaping each backslash you
want in your .tex file with 
another should be the way to go, e.g., the table end of
line would be written 
"\\\\" in R.

In detail I would like to add the following line of

code to the first row of an xtable object with the
add.to.row argument:

&? \multicolumn{4}{c}{A}

\multicolumn{4}{c}{B} \\

for which I have to convert it into a character

sting.

You are right, it does not seem to matter. When the R string contains
two \\, xtable prints it as only one \. I should have looked into the
Latex output before posting!