Have you tried `eval=FALSE` in the `knitr` code chunk options? e.g.:

    ```{r eval=FALSE}
    print(&quot;Don&#39;t run me&quot;)
    ```

`{r, eval=F, echo=T}` will include the R source code in the output file while it is not evaluated

Posting for anyone who may come across this like I have. I&#39;ve found that for small examples (if you don&#39;t want to use chunks), you can also just use back ticks like you would with regular markdown inline, but just don&#39;t add the &quot;r&quot; at the beginning:

    `plot(cars)`

Will print the code itself, but will not print the plot.



I am using iOS 7&#39;s new `NSURLSessionDataTask` to retrieve data as follows:

    NSURLSession *session = [NSURLSession sharedSession];
    
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:
    request completionHandler:
    ^(NSData *data, NSURLResponse *response, NSError *error) {
    //
    }];

How can I increase the time out values to avoid the error `&quot;The request timed out&quot;` (in  `NSURLErrorDomain` Code=`-1001`)?

I have checked the documentation for [NSURLSessionConfiguration][1] but did not find a way to set the time out value.

Thank you for your help!


  [1]: https://developer.apple.com/library/ios/documentation/Foundation/Reference/NSURLSessionConfiguration_class/Reference/Reference.html#//apple_ref/doc/uid/TP40013440-CH1-SW32

NSURLSession: How to increase time out for URL requests?

How do I get the min and max Dates from a dataframe&#39;s major axis?

               value
    Date                                           
    2014-03-13  10000.000 
    2014-03-21   2000.000 
    2014-03-27   2000.000 
    2014-03-17    200.000 
    2014-03-17      5.000 
    2014-03-17     70.000 
    2014-03-21    200.000 
    2014-03-27      5.000 
    2014-03-27     25.000 
    2014-03-31      0.020 
    2014-03-31     12.000 
    2014-03-31      0.022

 
Essentially I want a way to get the min and max dates, i.e. `2014-03-13` and `2014-03-31`. I tried using `numpy.min` or `df.min(axis=0)`, I&#39;m able to get the min or max value but that&#39;s not what I want

Getting min and max Dates from a pandas dataframe

I have a .Rpres file in RStudio. I would like to include code, but not have it run (I am only showing the code to explain how it works). Is it possible to accomplish this (and ensure that it will not produce errors, because it is not running)?

Include code that does not run in Rpresentation Markdown

<p>I have a .Rpres file in RStudio. I would like to include code, but not have it run (I am only showing the code to explain how it works). Is it possible to accomplish this (and ensure that it will not produce errors, because it is not running)?</p>


I want to send emails from R. This is what I have so far:

    library(sendmailR)
    
    
    from &lt;- &quot;eamil@example.com&quot;
    to &lt;- &quot;email2@example.com&quot;
    subject &lt;- &quot;Performance Result&quot;
    body &lt;- &quot;This is the result of the test:&quot;                     
    mailControl=list(smtpServer=&quot;snmpt server address&quot;)
    
    sendmail(from=from,to=to,subject=subject,msg=body,control=mailControl)

When I execute this script, my R session hangs. Any ideas what might be happening?

how do you send email from R

I am very new to R, and I could not find a simple example online of how to remove the last n characters from every element of a vector (array?) 

I come from a Java background, so what I would like to do is to iterate over every element of `a$data` and remove the last 3 characters from every element.

How would you go about it?

How to remove last n characters from every element in the R vector

I&#39;m wondering if there&#39;s a trick to put the current date in the YAML front-matter of a `.rmd` document to be processed by `knitr` and the `rmarkdown` package. I used to have the following line at the top of my wiki pages,

       _baptiste, `r format(Sys.time(), &quot;%d %B, %Y&quot;)`_

and it would get converted to _baptiste, 03 May, 2014_ in the html output. Now, I would like to take advantage of the advanced pandoc wrapper provided by `rmarkdown`, but having r code in the YAML header doesn&#39;t seem to work:

    ---
    title: &quot;Sample Document&quot;
    output:
      html_document:
        toc: true
        theme: united
    date: `r format(Sys.time(), &quot;%d %B, %Y&quot;)`
    author: baptiste
    ---

    Error in yaml::yaml.load(front_matter) : 
      Scanner error: while scanning for the next token at line 6, column 7
     found character that cannot start any token at line 6, column 7
    Calls: &lt;Anonymous&gt; ... output_format_from_yaml_front_matter -&gt; 
           parse_yaml_front_matter -&gt; &lt;Anonymous&gt; -&gt; .Call

Any workaround?


YAML current date in rmarkdown

I have a read large csv file into a data frame. Data in the csv file are from multiple web sites representing user information. For example here is the structure of the data frame.

    user_id, number_of_logins, number_of_images, web
    001, 34, 3, aa.com
    002, 4, 4, aa.com
    034, 3, 3, aa.com
    001, 12, 4, bb.com
    002, 1, 3, bb.com
    034, 2, 2, cc.com

as you can see once I bring the data into the data frame user_id is no longer a unique id and this causes all the analysis. I am trying to add another columns prior to `user_id` which is something like `&quot;generated_uid&quot;` and pretty much use the index of the `data.frame` to be filled by that column. What&#39;s the best way to accomplish this. 

Add an index (numeric ID) column to large data frame

I know that using `summary` will help me to do this manually, however, I will have to calculted tons of R-squared values. Therefore, I need the computer to extract it for me. Here is a simple example:

    library(alr3)
    M.lm=lm(MaxSalary~Score,data=salarygov)
    #Here you will see the R square value
    summary(M.lm)

How can I do that?

Extract R-square value with R in linear models

In my Githubs repos *documentation* I want to represent a directory tree structure like this:

![enter image description here][1]

Is there a way to do that with Github flavoured markdown, besides just creating it with ascii art?

So basically like [this question](https://stackoverflow.com/questions/19699059/representing-directory-file-structure-in-markdown-syntax), but I&#39;m wondering if there is a github specific solution.


  [1]: http://i.stack.imgur.com/8amGY.png

Is there a way to represent a directory tree in a Github README.md?

I&#39;m using Jekyll to create a documentation site wherein I am trying to document some code that contains handlebars-like syntax. For example `{{foo}}`. The problem is that Jekyll uses liquid tags and no matter what I do, my double curlies are getting ripped out by the liquid processor.

By the way, I&#39;m using kramdown as the markdown processor.

Here is something I&#39;ve tried:

    {% highlight html linenos %}
      Hello, my name is {{name}}.
    {% endhighlight %}

This one removes the {{name}} section completely because it thinks it&#39;s a reference to a liquid variable.

I also tried this:

    {% highlight html linenos %}
      Hello, my name is \{\{name\}\}.
    {% endhighlight %}

In this case, I&#39;m trying to escape the curly braces but the result is that the slashes get rendered into the page.

I even tried this:

    {% highlight html linenos %}
      Hello, my name is &lt;span&gt;{&lt;/span&gt;{name}}.
    {% endhighlight %}

Admittedly this one was pretty dumb. In this case, because I&#39;ve specified the syntax as html (which it needs to be), the span tag gets rendered into the page.

So how in the world can I resolve this?


Escaping double curly braces inside a markdown code block in Jekyll

I have a table:


        | This | Is | A | Table |
        | :--- | -- | - | ----: |
        | foo  | ba | r | elbaT |

I&#39;d like the table to display in the center of my Markdown file instead of left-aligned. I am not trying to align text, but the entire table itself. Do I need to resort to HTML/CSS to achieve what I want?

This is for an Apiary.io project.



Is it possible to center tables in a markdown file?

I&#39;m writing a wiki page on GitHub, and I&#39;m using Markdown. 

My problem is that I&#39;m putting a large image (this image is in its own repository) and I need resize it.

I have tried different solutions, but they do not work:

&lt;!-- language: none --&gt;

    ![image](http://url.to/image.png &quot;Title&quot; {width=40px height=400px})

    ![image](http://url.to/image.png = 250x250)

    ![image](http://url.to/image.png = 250x)

    [[http://url.to/image.png = 250x]]

Is there a way to get it?

It is preferable without HTML.


Resize image in the wiki of GitHub using Markdown

Is there a way to do it by adding latex code in the text or does the solution lie in (R)Markdown?

No sign of a solution here: http://rmarkdown.rstudio.com/pdf_document_format.html

At present I&#39;m bodging a solution by adding my `monospace` signature to the bottom of the 1st page, to force the next section to start on page 2: https://github.com/Robinlovelace/Creating-maps-in-R/blob/master/intro-spatial-rl.pdf


How to add whitespace to an RMarkdown document?

How to add new line in Markdown presentation?

I mean, something like `\newline` in TeX.

Content Type	Original Author	Original Content on Stackoverflow
Question	user2808302	View Question on Stackoverflow
Solution 1 - R	hrbrmstr	View Answer on Stackoverflow
Solution 2 - R	JdP	View Answer on Stackoverflow
Solution 3 - R	Meghan H.	View Answer on Stackoverflow

Include code that does not run in Rpresentation Markdown

R Problem Overview

R Solutions

Solution 1 - R

Solution 2 - R

Solution 3 - R

Getting min and max Dates from a pandas dataframe

NSURLSession: How to increase time out for URL requests?

Attributions