"P. B. Pynsent" <[EMAIL PROTECTED]> writes:
> I have a data.frame comprising percentiles with the column headings
> containing % characters, e.g.
> > (pp <- colnames(temp2))
> [1] "5%" "10%" "25%" "50%" "75%" "90%" "95%"
> I use xtable to convert the data.frame to Latex but I want to protect
> these % signs from Latex using a backslash in the normal way before
> calling xtable.
> I have tried using gsub as follows;
> > gsub("\%","\\%",pp)
> [1] "5%" "10%" "25%" "50%" "75%" "90%" "95%"
> also
...
> However I am very much left with the feeling that R is in control of
> me rather than vise versa.
The generic rule for backslashes is that you need twice as many as you
thought:
> p
[1] "25%"
> gsub("%","\\\\%",p)
[1] "25\\%"
> cat(gsub("%","\\\\%",p),"\n")
25\%
The thing that people usually forget is that you have two levels of
escaping, one in R's string parser and another one in the regexp
machinery.
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
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