I am using xtable and want my column names to containt a . The reason is, that I want to copy this into Latex and have Special symbols avaible. I have tried this:
names(xt) = c("$\\kappa$", "$\\theta$")
print(xt, math.style.exponents = TRUE)
but my names read \$$\backslash$kappa\$. This is nice because in Latex it translates to exactly what I wrote. But I want special characters, so it's not so nice for me. Can I somehow print the titles literally, or something similar?
print(xt, math.style.exponents = TRUE, sanitize.text.function=function(x){x})
As pointed out in the comments, this argument needs to be added so that the sanitization doesn't mess the titles up.
Related
I've got a CSV file that I am reading into an R script using fread. The resulting variable is a vector, which is what I need for the next step in my process. There are values in my CSV file such as 'Energy \nElectricity', and the intention is that these will be labels for a chart, with a line break between (in this case) 'Energy' and 'Electricity' for formatting reasons.
When I manually code the vector to be
myVec <- c('Energy \nElectricity'), this works fine and the line break is maintained.
When I read the data in using fread, however, the resulting vector is effectively c('Energy \\nElectricity'), i.e. the process has inserted an extra escape character and the formatting is lost.
My question is as follows:
Is there a way to use fread to maintain these line breaks at all?
If not, can I format them differently in my csv file?
If not, can I use gsub or similar to remove the extra line break once the file has been read into a vector?
I have tried all manner of ways to implement gsub (and sub), but they either get rid of both escape characters, such as gsub("\\\\", "\\", myVec) which gives
[1] "Energy nElectricity", or they throw an error. I think I am missing something obvious. Any help appreciated.
If nobody comes up with a better solution, this is how you would clean it using gsub:
gsub("\\n", "\n", "Energy \\nElectricity", fixed = TRUE)
The fixed option ignores all regex characters and is also considerably faster than fixed = FALSE.
This question is related to the utf-8 package for R. I have a weird problem in which I want emojis in a data set I'm working with to stay in code point representation (i.e. as '\U0001f602'). I want to use the 'FindReplace' function from the Data Combine package to turn UTF-8 encodings into prose descriptions of emojis in a dataset of YouTube comments (using a dictionary I made available here). The only issue is that when I 'save' the output as an object in R the nice utf-8 encoding generated by utf8_encode for which I can use my dictionary, it disappears...
First I have to adjust the dictionary a bit:
emojis$YouTube <- tolower(emojis$Codepoint)
emojis$YouTube <- gsub("u\\+","\\\\U000", emojis$YouTube)
Convert to character so as to be able to use utf8_encode:
emojimovie$test <- as.character(emojimovie$textOriginal)
This works great, gives output of \U0001f595 (etc.) that can be matched with dictionary entries when it 'prints' in the console.
utf8_encode(emojimovie$test)
BUT, when I do this:
emojimovie$text2 <- utf8_encode(emojimovie$test)
and then:
emoemo <- FindReplace(data = emojimovie, Var = "text2", replaceData = emojis, from = "YouTube", to = "Name", exact = TRUE)
I get all NAs. When I look at the output in $text2 with View I don't see the \U0001f595, I see actual emojis. I think this is why the FindReplace function isn't working -- when it gets saved to an object it just gets represented as emojis again and the function can't find any matches. When I try gsub("\U0001f602", "lolface", emojimovie$text2), however, I can actually match and replace things, but I don't want to do this for all ~2,000 or so emojis.... I've tried reading as much as I can about utf-8, but I can't understand why this is happening. I'm stumped! :P
It looks like in the above, you are trying to convert the UTF-8 emoji to a text version. I would recommend going the other direction. Something like
emojis <- read.csv('Emoji Dictionary 2.1.csv', stringsAsFactors = FALSE)
# change U+1F469 U+200D U+1F467 to \U1F469\U200D\U1F467
escapes <- gsub("[[:space:]]*\\U\\+", "\\\\U", emojis$Codepoint)
# convert to UTF-8 using the R parser
codes <- sapply(parse(text = paste0("'", escapes, "'"),
keep.source = FALSE), eval)
This will convert the text representations like U+1F469 to UTF-8 strings. Then, you can search for these strings in the original data.
Note: If you are using Windows, make sure you have the latest release of R; in older versions, the parser gives you the wrong result for strings litke "\U1F469".
The utf8::utf8_encode should really only be used if you have UTF-8 and are trying to print it to the screen.
I need to insert the species names in a table created by xtable in my Rnw file and I want to convert the relative column to italics format. Is it possible without any manual intervention?
My call is:
xtable(cklist, caption="Checklist...", align='lllc',label = 'tab:ckzygo')
To typeset a column in italics (or any other non-standard font shape), you should use the >{\cmd} syntax for column specification.
Assigning the column type >{\itshape}l generates a left-justified column in italics.
This is a better solution than iris$Species <- paste0("\\textit{", iris$Species, "}") as suggested in the comments because you neither have to modify your data nor you need to disable text sanitizing.
Small illustration:
\documentclass{article}
\usepackage{array}
\begin{document}
<<xtableItalics, results = "asis">>=
library(xtable)
print(xtable(head(iris), align = c(rep("l", 5), ">{\\itshape}l")))
#
\end{document}
The PDF looks like:
Please note that you need to use the array package for this to work.
EDIT: To show the flexibility of this approach, two more examples:
print(xtable(head(iris), align = c(rep("l", 5), ">{\\textit\\bgroup}l<{\\egroup}")))
print(xtable(head(iris), align = c(rep("l", 5), ">{\\textcolor{red}\\bgroup}l<{\\egroup}")))
The first line uses \textit{} instead of \itshape to typeset the italics. As \textit{} requires the text to modify as an argument, we need a slightly more complex syntax. (It's described in the wikibooks.org article linked above.)
This syntax can also be used to change for example the color of the text. In more complex cases, lrbox is required, as described in the linked article.
In the knitr package I like the kable function. It gives a nice layout of tables and data frame like objects even as it is called from within an R code chunk. Now I want to do the same thing with a character value. Is there a function that gives a kable-like output ("kprint") that can be formated?
knitr::kable() # exists for tables
knitr::kprint() # does a function like this exists for character values?
This is what I get now:
print("character value") # within the R Chunk
Output in generated report:
## [1] "character value"
And this is what I want, just:
character value
EDIT cat("character value") is not the solution I am looking for because I don't want an R output anymore, but just a plain text.
There are two things to do to get a "raw" character string (without any formatting or additional output like [1]) from R to TEX:
Use the chunk option results = "asis" to instruct knitr not to modify the output.
Use cat instead of print because print adds the lenght of the vector and quotes to the output.
In this context, inline output using \Sexpr{} might be useful because values in \Sexpr{} are by default printed "as they are": \Sexpr{myoutput}.
As there was the question of how to format the output in the comments, here some options:
Add LaTeX to the text you pass to cat: cat("\\emph{foo}"). Don't forget to escape \ by an additional \.
Do the same thing as above, but use a function to do the "dirty work":
makeItNiceR <- function(x) {
return(paste("\\fbox{\\texttt{", x, "}}"))
}
cat(makeItNiceR("foo bar is nice"))
(Note that we could use cat inside makeItNiceR to save some typing, but this makes the function less flexible and we cannot use it in combination with \Sexpr{} anymore.)
Manually add LaTeX formatting commands around \Sexpr{}:
Add formatting to \emph{\Sexpr{myoutput}} directly in LaTeX.
Combine makeItNiceR and \Sexpr{} to get nicely formatted output from \Sexpr{}:
\Sexpr{makeItNiceR(paste(myoutput, "is nice"))}
The following minimal examples demonstrates the usage of all code snippets from above:
\documentclass{article}
\begin{document}
<<results = "asis">>=
makeItNiceR <- function(x) {
return(paste("\\fbox{\\texttt{", x, "}}"))
}
myoutput <- "slim"
cat("foo")
cat("\\emph{foo}")
cat(makeItNiceR("foo bar is nice"))
#
\paragraph{Outside of chunk:} ~\\
\Sexpr{myoutput} \\
Add formatting to \emph{\Sexpr{myoutput}} directly in LaTeX. \\
\Sexpr{makeItNiceR(paste(myoutput, "is nice"))}
\end{document}
I'm working on a document in R, with knitr to pdflatex and am using the extended version of toLatex from memisc.
When I'm producing a table with cut intervals however, the square brackets are not sanitised and the pdflatex job errors because of the existence of [.
I tried putting sanitize=TRUE in the knitr chunk code, but this only works for tikz.
Previously, I have used gsub and replaced the string in the R object itself which is rather inelegant. I'm hoping someone could point me in the direction of a nuance of memisc or knitr that I'm missing or another function/method that would easily handle latex special characters.
Example
library("memisc")
library("Hmisc")
example<-data.frame(cbind(x=1:100,y=1:100))
example$x<-cut2(example$x,m=20)
toLatex(example)
UPDATE
Searching SO I found a post about applying latexTranslate with apply function, but this requires characters so I would have to unclass from factor to character.
I found another SO post that identifies the knitr:::escape_latex function however, the chunk then outputs the stuff as markup instead of translating it (using results='asis') or produces an R style table inside a code block (using results='markup'). I tried configuring it as a hook function in my parent document and it had the effect of outputting all the document contents as markup. This is a brand new area for me so I probably implemented it incorrectly.
<<setup,include=FALSE>>=
hook_inline = knit_hooks$get('inline')
knit_hooks$set(inline = function(x) {
if (is.character(x)) x = knitr:::escape_latex(x)
hook_inline(x)
})
#
...
<<tab-example,echo=FALSE,cache=TRUE,results='asis',sanitize=TRUE,inline=TRUE>>=
library("Hmisc")
library("memisc")
example<-data.frame(cbind(x=1:100,y=1:100))
example$x<-cut2(example$x,m=20)
toLatex(example)
#
According to #yihui this is the wrong way to go
UPDATE 2
I have created a gsub wrapper which will escape percentages etc, however the [ symbol still pushes latex into maths mode and errors.
Courtesy of folks on the tex SE, a [ directly after a line break(\\) is considered an entry into math-mode. It is very simple to prevent this behaviour by adding {} into the output just before a [. My function looks like:
escapedLatex<-function (df = NULL)
{
require("memisc")
gsub(gsub(x = toLatex(df, show.xvar = TRUE), pattern = "%",
replacement = "\\%", fixed = TRUE), pattern = "[", replacement = "{}[",
fixed = TRUE)
}
I'd be very happy to see any alternative, more elegant solutions around and will leave it open for a few days.