Having this code in a test.md file
$$
\begin{aligned}
20x 1 \leqt 70
\end{aligned}
$$
When I use RStudio button Preview Html the equation is well formatted using Mathjax.
But when I try to do it using markdownToHTML function:
for example
markdownToHTML('test.md', 'test.html'),
the equation is not formatted.
The bug is due to the extra blank line after my equation( I can't remove it because the equation is generated using an R chunk and the cat command)
Does Rstudio does any post-processing on .md files to remove blank lines between $$ ?
For RStudio, we actually have our own version of the markdown package embedded which does the conversion from .md to .html. I tried your scenario and was able to reproduce as well. I recommend reporting this to Jeff Horner to see if there is a bug here that he can fix:
http://cran.r-project.org/web/packages/markdown/index.html
https://github.com/rstudio/markdown
Josh
Product Manager - RStudio
Related
I have written a document in the jupyter notebook as a markdown (.md) file. The document contains some mathematical equation which I have written inside $$ equation $$, for example,
$$c = \sqrt{a^2 + b^2}$$
Now, when I push the .md file in the Gitlab, my equations are appearing in the latex format, like
$$c = \sqrt{a^2 + b^2}$$
The file was okay when I did the print preview but in the GitLab the equations are appearing inside $$...$$.
Could you pls help me to resolve the issue?
Thanks!!
I have found a solution to resolve the issue. Most of the solutions are mentioned in the below link in the math section
https://docs.gitlab.com/ee/user/markdown.html
To summarise
This math is inline $`a^2+b^2=c^2`$
This is on a separate line
```math
a^2+b^2=c^2
```
Separate line with equation number
```math
\tag{1} a^2+b^2=c^2
```
Now, I am trying to find how to add \label{} in the equation.
I have a simple LaTex code in my R notebook as
$y=\frac{(x-\mu)}{(max-min)}$
When I hover on the code, I see the output and also when I knit to HTML. However, how do I see the rendered output within the .RMD file?
I know this can be done because once I accidentally hit something on the keyboard and I was able to see the rendered LaTeX output within the .RMD file itself. I just do not know what I hit and I am not able to reproduce that behavior. I was not able to find in documentation as well.
Display equations (surrounded with $$) preview as a chunk result rather than a popup, as inline equations ($) do.
$$y=\frac{(x-\mu)}{(max-min)}$$
However, note that $$ will print the math in its own paragraph/div while $ produces inline output. AFAIK, there is no way to have inline equations preview without hovering over them.
I'm brand new to R, as in my class just began two days ago. In our first assignment we are to show our work and answers, which are written in R Markdown (inside R Studio) and then output in PDF.
On one question we are asked to display the quadratic equation. I know the command, which I figured out is $$ x=\frac{ -b \pm \sqrt{ b^2 - 4ac} }{2a} $$.
After I Knit the file to PDF the equation shows up all nice and pretty. However, I cannot figure out how to also get the command to also display to show my work. If I prefix the command with an asterisk, backslash, hashtag, etc., after I knit the file it shows the prefix and then just displays the quadratic equation but not the command.
I'd ask my prof, but he actually suggested we try Stack Overflow with questions in the syllabus (haha!), then referred to himself as a "facilitator more than a teacher". Hmmm. So here I am.
One option is to insert a chunk with your equation:
```
$$ x=\frac{ -b \pm \sqrt{ b^2 - 4ac} }{2a} $$.
```
What commands are run when pressing "Knit HTML" on an R Markdown file in Rstudio 0.96?
My motivation is that I might want to run the same command when I'm in another text editing environment or I might want to combine the command in a larger makefile.
Basic Script
So now that the R markdown package has been released, here is some code to replicate the features of Knit to Html.
require(knitr) # required for knitting from rmd to md
require(markdown) # required for md to html
knit('test.rmd', 'test.md') # creates md file
markdownToHTML('test.md', 'test.html') # creates html file
browseURL(paste('file://', file.path(getwd(),'test.html'), sep='')) # open file in browser
where test.rmd is the name of your R markdown file.
Note that I'm not 100% confident about the browseURL line (hence my question here about opening files in a web browser).
markdownToHTML Options
The good thing about markdownToHTML is that there are heaps of options in how the HTML is created (see ?markdownHTMLOptions). So for example, if you want just a code fragment without all the header information, you could write:
markdownToHTML('test.md', 'test.html', options='fragment_only')
or if you don't like hard wrapping (i.e., inserting line breaks when there are single manual line breaks in the markdown source), you can omit the 'hard_wrap' option.
# The default options are 'hard_wrap', 'use_xhtml',
# 'smartypants', and 'base64_images'.
markdownToHTML('test.md', 'test.html',
options=c('use_xhtml', 'base64_images'))
Makefile
This could also all be added to a makefile perhaps using Rscript -e (e.g., something like this). Here's a basic example makefile I put together, where test indicates that the rmd file is called test.rmd.
RMDFILE=test
html :
Rscript -e "require(knitr); require(markdown); knit('$(RMDFILE).rmd', '$(RMDFILE).md'); markdownToHTML('$(RMDFILE).md', '$(RMDFILE).html', options=c('use_xhtml', 'base64_images')); browseURL(paste('file://', file.path(getwd(),'$(RMDFILE).html'), sep=''))"
The makefile uses my preferred markdown options: i.e., options=c('use_xhtml', 'base64_images')
Put Sys.sleep(30) in a chunk and you will see clearly what commands are called by RStudio. Basically they are
library(knitr); knit() to get the markdown file;
RStudio has internal functions to convert markdown to HTML;
The second step will be more transparent in the next version of the markdown package. Currently you can use knitr::knit2html('your_file.Rmd') to get a similar HTML file as RStudio gives you.
Update on 2019/09/17: The above answer applies to RStudio v0.96 (in the year 2012). Now R Markdown is compiled through rmarkdown::render(), which uses Pandoc instead of the retired R package markdown. See the post Relationship between R Markdown, Knitr, Pandoc, and Bookdown for more details.
Very easy command line method from knitr in a knutshell:
R -e "rmarkdown::render('knitr_example.Rmd')"
This requires rmarkdown to be installed with install.packages(rmarkdown) and that pandoc is installed (apparently it comes with Rstudio, see knitr in a knutshell for more details).
So far when I've used this it nicely puts all the plots in the HTML file rather than as images in a figure directory and cleans up any intermediate files, if any; just like compilation in RStudio does.
It seems you should call rmarkdown::render() instead of knitr::knit2html() because a.rmd appears to be an R Markdown v2 document.
I was learning about using the command line version of latex today, and I was experimenting with outputting .tex to .dvi, and then .dvi to .png.
The problem is, I have a simple .tex document which contains some math. The goal is to eventually produce a png form of the equation. But when I run:
$ latex -output-format=dvi test.tex
$ dvipng test.dvi
I get test1.png that is shaped like a regular letter-sized page. I only want an image that is as big as the equation needs to be. I'm sure I'm missing something obvious, but I can't figure it out!
Is there a command line option for either latex or dvipng to specify that the output file should only be set on a page as large as needed to render the equation?
Here's my example test.tex:
\documentclass{article}
\begin{document}
The solution to $\sqrt{x} = 5$ is $x=25$.
\end{document}
Thanks!
Try
dvipng -T tight filename
EDIT: As Mr tur1ing points out, you'll also want \pagestyle{empty} to avoid having a page number muck up the works.
Try mathurl and Roger's Online Equation Editor. There probably several other such sites.