Dear Thierry, Your suggestion doesn't work on my version of R. Here's what I get > gsub("_", "\_", print(version$platform) Error: '\_' is an unrecognized escape in character string starting ""\_" > print(gsub("_", "\_", version$platform)) Error: '\_' is an unrecognized escape in character string starting ""\_"
> sub("_", "\\_", version$platform) [1] "x86_64-apple-darwin10.8.0" Sweave does not evaluate this expression when \Sexpr is applied and a tex error results > sub("_", "\\\_", version$platform) Error: '\_' is an unrecognized escape in character string starting ""\\\_" Error message from R > sub("_", "\\\\_", version$platform) [1] "x86\\_64-apple-darwin10.8.0" R evaluates this. However, the above examples indicate a deficiency/possible bug in the command sub, because sub does not seem to be able to output an expression with a single backslash. I tried the previous version as follows in my .Rnw document \Sexpr{print(sub("_", "\\\\_", version$platform))} When Sweave is run, this expression is evaluated to illegal LaTeX David. On 2 Sep 2013, at 16:47, ONKELINX, Thierry wrote: > You have to escape the underscore > > \Sexpr{gsub("_", "\_", print(version$platform))} > > Best regards, > > Thierry > > ________________________________________ > Van: r-help-boun...@r-project.org [r-help-boun...@r-project.org] namens David > Epstein [david.epst...@warwick.ac.uk] > Verzonden: maandag 2 september 2013 17:38 > Aan: r-help@r-project.org > Onderwerp: [R] Sweave: printing an underscore in the output from an R command > > I am working with Sweave and would like to print out into my latex document > the result of the R command > version$platform > So what I first tried in my .Rnw document was \Sexpr{print(version$platform)}. > > However, the output from this command is the string > "x86_64-apple-darwin10.8.0" (without the quotes). This contains an > underscore, which is a special character in tex and so I get an error message > from latex. > > I can get round this by using sub to replace underscore with a space, but I > would like to know how to print the underscore if I really wanted to do so. > > ______________________________________________ > R-help@r-project.org 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. > * * * * * * * * * * * * * D I S C L A I M E R * * * * * * * * * * * * * > Dit bericht en eventuele bijlagen geven enkel de visie van de schrijver weer > en binden het INBO onder geen enkel beding, zolang dit bericht niet bevestigd > is door een geldig ondertekend document. > The views expressed in this message and any annex are purely those of the > writer and may not be regarded as stating an official position of INBO, as > long as the message is not confirmed by a duly signed document. > ______________________________________________ R-help@r-project.org 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.