Hello Everyone,
I am an avid Sweave user and I am trying to pretty print floating point
numbers for latex output. For example in my document, I would like:
4.2\cdot 10^-{8}
Instead of:
4.2e-08
The Hmisc package has a nice function for doing this- but Hmisc has a ton of
dependencies and has proved very unportable to the various machines I work
on. So, I set out to write my own function that just uses basic R commands,
it looks like this:
latexNum <- function (x,dig=4,sci=T)
{
x <- format(x,digits=dig,scientific=sci)
x <- gsub("e\\+00","",x)
x <- gsub("e\\-0([0-9]*)","\\\\cdot
10^{-\\1}",x)
x <- gsub("e\\-([0-9]*)","\\\\cdot 10^{-\\1}",x)
x <- gsub("e\\+0([0-9]*)","\\\\cdot 10^{\\1}",x)
x <- gsub("e\\+([0-9]*)","\\\\cdot 10^{\\1}",x)
return(x)
}
Everything works nicely, if I type
> latexNum(4*10^-3)
I get
[1] "4\\cdot10^{-3}"
And the following:
> cat(latexNum(4*10^-3))
Produces:
4\cdot10^{-3}
However the following in a .Rnw file:
$\Sexpr{latexNum(4*10^-3)}$\\
Only produces this in the .tex output file:
$4cdot 10^{-3}$\\
No amount of extra backslashing seems to help. Any idea why my escapes are
not being respected?
-----
Charlie Sharpsteen
Undergraduate
Environmental Resources Engineering
Humboldt State University
--
View this message in context:
http://www.nabble.com/Sweave-and-backslashes-tp21864385p21864385.html
Sent from the R help mailing list archive at Nabble.com.
cls59 wrote:> Hello Everyone, > > I am an avid Sweave user and I am trying to pretty print floating point > numbers for latex output. For example in my document, I would like: > > 4.2\cdot 10^-{8} > > Instead of: > > 4.2e-08 > > The Hmisc package has a nice function for doing this- but Hmisc has a ton of > dependencies and has proved very unportable to the various machines I work > on. So, I set out to write my own function that just uses basic R commands,Please name the dependencies that are bothering you. Frank Harrell> it looks like this: > > latexNum <- function (x,dig=4,sci=T) > { > x <- format(x,digits=dig,scientific=sci) > > x <- gsub("e\\+00","",x) > x <- gsub("e\\-0([0-9]*)","\\\\cdot 10^{-\\1}",x) > x <- gsub("e\\-([0-9]*)","\\\\cdot 10^{-\\1}",x) > x <- gsub("e\\+0([0-9]*)","\\\\cdot 10^{\\1}",x) > x <- gsub("e\\+([0-9]*)","\\\\cdot 10^{\\1}",x) > > return(x) > } > > Everything works nicely, if I type > >> latexNum(4*10^-3) > > I get > > [1] "4\\cdot10^{-3}" > > And the following: > >> cat(latexNum(4*10^-3)) > > Produces: > > 4\cdot10^{-3} > > However the following in a .Rnw file: > > $\Sexpr{latexNum(4*10^-3)}$\\ > > Only produces this in the .tex output file: > > $4cdot 10^{-3}$\\ > > No amount of extra backslashing seems to help. Any idea why my escapes are > not being respected? > > ----- > Charlie Sharpsteen > Undergraduate > Environmental Resources Engineering > Humboldt State University-- Frank E Harrell Jr Professor and Chair School of Medicine Department of Biostatistics Vanderbilt University
On Thu, 5 Feb 2009, cls59 wrote:> > Hello Everyone, > > I am an avid Sweave user and I am trying to pretty print floating point > numbers for latex output. For example in my document, I would like: > > 4.2\cdot 10^-{8} > > Instead of: > > 4.2e-08 > > The Hmisc package has a nice function for doing this- but Hmisc has a ton of > dependencies and has proved very unportable to the various machines I work > on. So, I set out to write my own function that just uses basic R commands, > it looks like this: > > latexNum <- function (x,dig=4,sci=T) > { > x <- format(x,digits=dig,scientific=sci) > > x <- gsub("e\\+00","",x) > x <- gsub("e\\-0([0-9]*)","\\\\cdot 10^{-\\1}",x) > x <- gsub("e\\-([0-9]*)","\\\\cdot 10^{-\\1}",x) > x <- gsub("e\\+0([0-9]*)","\\\\cdot 10^{\\1}",x) > x <- gsub("e\\+([0-9]*)","\\\\cdot 10^{\\1}",x) > > return(x) > } > > Everything works nicely, if I type > >> latexNum(4*10^-3) > > I get > > [1] "4\\cdot10^{-3}" > > And the following: > >> cat(latexNum(4*10^-3)) > > Produces: > > 4\cdot10^{-3} > > However the following in a .Rnw file: > > $\Sexpr{latexNum(4*10^-3)}$\\The syntax Sweave uses is fairly sensitive to backslashes. I might guess that this is a feature to protect against runaway expressions. You need to add a backslash to undo what Sweave does to the backslashes in that type of expression. Put extra.slash <- function(x) sub('\\','\\\\', x, fixed=TRUE) in an earlier code chunk and then call \Sexpr(extra.slash( latexNum( 4*10^3 ) ) ) or better still just use a code chunk like this: @ <<echo=F,results=tex>> cat( latexNum( 4*10^3 ) ) @ %def HTH, Chuck> > Only produces this in the .tex output file: > > $4cdot 10^{-3}$\\ > > No amount of extra backslashing seems to help. Any idea why my escapes are > not being respected? > > ----- > Charlie Sharpsteen > Undergraduate > Environmental Resources Engineering > Humboldt State University > -- > View this message in context: http://www.nabble.com/Sweave-and-backslashes-tp21864385p21864385.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help at 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. >Charles C. Berry (858) 534-2098 Dept of Family/Preventive Medicine E mailto:cberry at tajo.ucsd.edu UC San Diego http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
cls59 <sharpsteen <at> mac.com> writes:> I am an avid Sweave user and I am trying to pretty print floating point > numbers for latex output. For example in my document, I would like: > > 4.2\cdot 10^-{8} > > Instead of: > > 4.2e-08 > > The Hmisc package has a nice function for doing this- but Hmisc has a ton of > dependencies and has proved very unportable to the various machines I work > on. So, I set out to write my own function that just uses basic R commands, > it looks like this:I have my special version of it in the library : "latexSNdouble" <- function (val) { # special copy of Hmisc latexSN with \\\\ require(Hmisc) x <- format(val) x <- sedit(val, c("e+00", "e-0*", "e-*", "e+0*", "e+*"), c("", "\\\\!\\\\times\\\\!10^{-*}", "\\\\!\\\\times\\\\!10^{-*}", "\\\\!\\\\times\\\\!10^{*}", "\\\\!\\\\times\\\\!10^{*}")) x }