# Problem with large/small numbers in knitr

3 messages
 I have problems with very large numbers using knitr. In the following, my a and b are extremely small and ssrr and ssru are extremely large. Knitr delivers error messages. Scaling ssrr and ssru by 1000 resolved the problem: ssrr <-ssrr/1000 ;  ssru<-ssru/1000 Any clue as to how I might resolve the problem? BTW, the same program does run in another computer. I am wondering whether my installation of Scientific Work place interferes, and if so, what else I might do to avoid the problem. \documentclass{article} \begin{document} <>= ## numbers >= 10^5 will be denoted in scientific notation, ## and rounded to 2 digits options(scipen = 1, digits = 2) <<>>= a<-1e-13 b<-2.5e-10 ssrr<-123456.12 ssru<-123400.00 @ $c=\Sexpr{a}/\Sexpr{b} % either this formula or the following formula will has error message "missing$" after click "complie" in Rstudio. f=\Sexpr{ssrr-ssru}/\Sexpr{ssru} $\end{document} Reply | Threaded Open this post in threaded view | ## Re: Problem with large/small numbers in knitr  (The same question was cross-posted in the knitr mailing list, so cc'ed as well) According to the other email from Steven, this problem was solved by reinstalling R. I cannot reproduce the problem under either Ubuntu or Windows (regardless of 32-bit or 64-bit R), so I have no idea of what happened. All I can suggest in this case is to update R and run update.packages() as indicated by FAQ1: https://github.com/yihui/knitr/blob/master/FAQ.mdRegards, Yihui -- Yihui Xie <[hidden email]> Phone: 515-294-2465 Web: http://yihui.nameDepartment of Statistics, Iowa State University 2215 Snedecor Hall, Ames, IA On Wed, Dec 26, 2012 at 6:28 PM, xiaodao <[hidden email]> wrote: > I have problems with very large numbers using knitr. In the following, my a > and b are extremely small and ssrr and ssru are extremely large. Knitr > delivers error messages. Scaling ssrr and ssru by 1000 resolved the problem: > ssrr <-ssrr/1000 ; ssru<-ssru/1000 > Any clue as to how I might resolve the problem? > BTW, the same program does run in another computer. I am wondering whether > my installation of Scientific Work place interferes, and if so, what else I > might do to avoid the problem. > > \documentclass{article} > \begin{document} > > <>= > ## numbers >= 10^5 will be denoted in scientific notation, > ## and rounded to 2 digits > options(scipen = 1, digits = 2) > > <<>>= > a<-1e-13 > b<-2.5e-10 > ssrr<-123456.12 > ssru<-123400.00 > @ > >$ > c=\Sexpr{a}/\Sexpr{b} % either this formula or the following formula will > has error message "missing $" after click "complie" in Rstudio. > f=\Sexpr{ssrr-ssru}/\Sexpr{ssru} >$ > > \end{document} > > > > -- > View this message in context: http://r.789695.n4.nabble.com/Problem-with-large-small-numbers-in-knitr-tp4653986.html> Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > [hidden email] 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. ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
 In reply to this post by xiaodao On 26.12.2012 23:28, xiaodao wrote: > I have problems with very large numbers using knitr. In the following, my a > and b are extremely small and ssrr and ssru are extremely large. > > \documentclass{article} > \begin{document} > > <>= > ## numbers >= 10^5 will be denoted in scientific notation, > ## and rounded to 2 digits > options(scipen = 1, digits = 2) > > <<>>= > a<-1e-13 > b<-2.5e-10 > ssrr<-123456.12 > ssru<-123400.00 > @ > > $> c=\Sexpr{a}/\Sexpr{b} % either this formula or the following formula will > has error message "missing$" after click "complie" in Rstudio. > f=\Sexpr{ssrr-ssru}/\Sexpr{ssru} > $> > \end{document} > I copied your file to "abc.Pnw", then opened an R session and run setwd("") library(knitr) knit("abc.Rnw") I got the following text in the resulting abc.tex file:$ c=$10^{-13}$/$2.5\times 10^{-10}$ % either this formula or ... f=56.12/$1.23\times 10^{5}$ $knitr converts large numbers in Sexpr to the exponential notation, so you've got a nested math environment here. You can convert your numbers to strings with as.character() Alternative: if you run knit_hooks$get("inline") you get the function used for inline output procession https://github.com/yihui/knitr/issues/33-> if you write knit_hooks$set()$inline function (x) {     if (is.numeric(x))         x = round(x, getOption("digits"))     paste(as.character(x), collapse = ", ") } in your setup chunk (did you forget the closing @ in your setup chunk?), it also works. (which is strange, because this function is exactly what is predefinded by knitr but that's another question Regards, Moritz -- GnuPG Key: 0x7340821E ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.