You are looking for [`file.edit`](https://stat.ethz.ch/R-manual/R-devel/library/utils/html/file.edit.html)


    file.edit(&#39;test.R&#39;)

should open the file in an editor (if you are in `RStudio`, this should default to `RStudio`)






It appears that if you are using RStudio then another option is to use `rstudioapi::navigateToFile(&quot;test.R&quot;)`

Another alternative is the [shell.exec][1] function. 

`shell.exec(&quot;text.R&quot;)` # This will open the file or URL using the path associated with it

Also, I think for your use case. This code snippet might be a little bit useful.

    file &lt;- &quot;example.csv&quot;
    sub_dir &lt;- &quot;subdirectory&quot;
    dir.create(sub_dir)
    writeLines(&quot;myfile&quot;,file.path(sub_dir, file))
    # Works
    shell.exec(file.path(sub_dir, file, fsep = &quot;\\&quot;))
    shell.exec(file.path(sub_dir, file))


  [1]: https://www.rdocumentation.org/packages/base/versions/3.4.1/topics/shell.exec

I had the same issue that `utils::file_edit()` within my package opens outside R-studio. I changed it to `usethis::edit_file()`. With this function the file opens inside R-studio.


I was just wondering what could happen if, while an ajax call is being executed, an alert is prompted to the user, in the browser window.

Let&#39;s say, for example, that I have an ajax call

    $.ajax({
        url: ...,
        type: GET/POST,
        ...
        success: function(data){
            console.log(data);
        },
        error: ...
    });

that takes long time to complete (10 sec). While the call is executed, a simple javascript alert is thrown

    alert(&quot;hello!&quot;);

What happens for example if:

1. ajax call starts
2. ajax call fetching data
3. alert is shown
4. ajax call returns data (alert window is still open!)

Knowing that JS is single threaded I know that the script execution will halt, I was just wondering what happens to the ajax call/response if the alert window is not closed &quot;in time&quot;.

I hope I was clear enough and that this is not a &quot;dummy&quot; question. Thank you 



What happens if an alert window is shown during an ajax call?

I have a C++ program. This program does something like this:

    struct MyT {void memfunc(std::unique_ptr&lt;MyT&gt; arg);};
    std::unique_ptr&lt;MyT&gt; obj = /* some init */;
    obj-&gt;memfunc(std::move(obj));

Is this guaranteed to be valid, or can I end up calling a member function on `nullptr`?  
Standard quotes applicable.  
I know that the order of evaluation of the arguments is unsequenced, but I don&#39;t recall what the sequencing is w.r.t. the function object being called.

In f(x), can x be evaluated before f?

I have a simple script file called `test.R`. It&#39;s saved in the working directory. When I go to `File &gt; Open &gt; test.R`, it opens the file in the editor (without executing the code, which is what I want). 

How do I do this by typing a command in the console window? To be clear, I just want to open (**not** execute) the file.

How do I open a script file in RStudio using an R command?

I have a simple script file called <code>test.R</code>. It's saved in the working directory. When I go to <code>File > Open > test.R</code>, it opens the file in the editor (without executing the code, which is what I want).
How do I do this by typing a command in the console window? To be clear, I just want to open (not execute) the file.

When I run `R CMD check --as-cran`  on my package, the one note I still get is:

    checking CRAN incoming feasibility ... NOTE 
    Maintainer:[my name] &lt;my email&gt;

I can&#39;t seem to find a good explanation of this note, although I haven&#39;t read anything that tells my I should be concerned about it.  As anyone else run into this?  Is there anything I can do that will clear the note?

checking CRAN incoming feasibility ... NOTE Maintainer

Is there a way to read a Stata version 13 dataset file in R?

I have tried to do the following:

    &gt; library(foreign)
    &gt; data = read.dta(&quot;TEAdataSTATA.dta&quot;) 

However, I got an error:

&gt;Error in read.dta(&quot;TEAdataSTATA.dta&quot;) :   
&gt;not a Stata version 5-12 .dta file

Could someone point out if there is a way to fix this?



Read Stata 13 file in R

I am using RStudio for writing markdown documents and want to add Table of Contents (TOC) at top of the documents so that the user could click the relevant section for reading. There were some relevant examples on rpubs but now I can&#39;t seem to find them. Please note that I don&#39;t use `pandoc` and am quite new to `Rmd` &amp; `knitr`. Is there any way to add TOCs without using `pandoc`? If using `pandoc` is must then which functions are relevant?

# EDIT

Here&#39;s a small sample page:

    ---
    title: &quot;Sample Document&quot;
    output:
      html_document:
        toc: true
        theme: united
    ---

    Header 1
    ---------------
    This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see &lt;http://rmarkdown.rstudio.com&gt;.
        
    ## Header 2
    When you click the **Knit** button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:
        
    ```{r}
    summary(cars)
    ```
    
    You can also embed plots, for example:
    
    ```{r, echo=FALSE}
    plot(cars)
    ```
    ### Header 3
    Note that the `echo = FALSE` parameter was added to the code chunk to prevent printing of the R code that generated the plot.

I tried running this in RStudio v 0.98.864 and it worked! but sadly it didn&#39;t work on 0.98.501 and 0.98.507. I am working on my thesis in 0.98.501 and after updating RStudio, some of my analyses didn&#39;t work. So, I reverted back to 0.98.501.
What should I do now? I really want TOCs but without harming the outputs of other analyses.


How to add table of contents in Rmarkdown?

I want to count the number of `NA` values in a data frame column. Say my data frame is called `df`, and the name of the column I am considering is `col`. The way I have come up with is following:  

    sapply(df$col, function(x) sum(length(which(is.na(x)))))  

Is this a good/most efficient way to do this?
    

Determine the number of NA values in a column

I wish to (1) group data by one variable (`State`), (2) within each group find the row of minimum value of another variable (`Employees`), and (3) extract the entire row.

(1) and (2) are easy one-liners, and I feel like (3) should be too, but I can&#39;t get it.

Here is a sample data set:

    &gt; data
      State Company Employees
    1    AK       A        82
    2    AK       B       104
    3    AK       C        37
    4    AK       D        24
    5    RI       E        19
    6    RI       F       118
    7    RI       G        88
    8    RI       H        42

    data &lt;- structure(list(State = structure(c(1L, 1L, 1L, 1L, 2L, 2L, 2L, 
            2L), .Label = c(&quot;AK&quot;, &quot;RI&quot;), class = &quot;factor&quot;), Company = structure(1:8, .Label = c(&quot;A&quot;, 
            &quot;B&quot;, &quot;C&quot;, &quot;D&quot;, &quot;E&quot;, &quot;F&quot;, &quot;G&quot;, &quot;H&quot;), class = &quot;factor&quot;), Employees = c(82L, 
            104L, 37L, 24L, 19L, 118L, 88L, 42L)), .Names = c(&quot;State&quot;, &quot;Company&quot;, 
            &quot;Employees&quot;), class = &quot;data.frame&quot;, row.names = c(NA, -8L))

Calculate `min` by group is easy, using `aggregate`:

    &gt; aggregate(Employees ~ State, data, function(x) min(x))
      State Employees
    1    AK        24
    2    RI        19

...or `data.table`:
    
    &gt; library(data.table)
    &gt; DT &lt;- data.table(data)
    &gt; DT[ , list(Employees = min(Employees)), by = State]
       State Employees
    1:    AK        24
    2:    RI        19

But how do I extract the entire row corresponding to these `min` values, i.e. also including `Company` in the result? 

Extract row corresponding to minimum value of a variable by group

I am using Rstudio and not sure how options &quot;run&quot; and &quot;source&quot; are different.

I tried googling these terms but &#39;source&#39; is a very common word and wasn&#39;t able to get good search results :(

![enter image description here][1]


  [1]: http://i.stack.imgur.com/2GHjV.jpg

Rstudio difference between run and source

I wonder how to use `rmarkdown` to generate a pdf which has both portrait and landscape layout in the same document. If there is a pure `rmarkdown` option that would be even better than using latex.

Here&#39;s a small, reproducible example. First, rendering this `.Rmd` in RStudio (press **Knit PDF** button) results in a pdf with all pages in landscape layout:

    ---
    title: &quot;All pages landscape&quot;
    output: pdf_document
    classoption: landscape
    ---
      
    ```{r}
    summary(cars)
    ```
    
    \newpage
    ```{r}
    summary(cars)
    ```

Then an attempt to create a document which mixes portrait and landscape layout. The basic setup in the `YAML` is done according to the &#39;Includes&#39; section [**here**](http://rmarkdown.rstudio.com/pdf_document_format.html). The `in_header` file &#39;header.tex&#39; only contains `\usepackage{lscape}`, a package suggested for `knitr` landscape layout [**here**](https://github.com/yihui/knitr-examples/blob/master/030-landscape.Rnw). The `.tex` file is in the same directory as the `.Rmd` file.  

    ---
    title: &quot;Mixing portrait and landscape&quot;
    output:
        pdf_document:
            includes:
                in_header: header.tex
    ---
    
    Portrait:
    ```{r}
    summary(cars)
    ```
    
    \newpage
    \begin{landscape}
    Landscape:
    ```{r}
    summary(cars)
    ```
    \end{landscape}
    
    \newpage
    More portrait:
    ```{r}
    summary(cars)
    ```

However, this code results in an error:

    # ! You can&#39;t use `macro parameter character #&#39; in horizontal mode.
    # l.116 #
    
    # pandoc.exe: Error producing PDF from TeX source
    # Error: pandoc document conversion failed with error 43

Any help is much appreciated.

Rstudio rmarkdown: both portrait and landscape layout in a single PDF

I&#39;m trying to follow [this pandoc example](http://johnmacfarlane.net/pandoc/demo/example9/pandocs-markdown.html#yaml-metadata-block) to add multiple authors to an Rmarkdown file in the [yaml metadata block](http://rmarkdown.rstudio.com/authoring_pandoc_markdown.html#yaml-metadata-block). The pdf will generate in RStudio (Version 0.98.932), but there is no author information. 

    ---
    title:  &#39;This is the title: it contains a colon&#39;
    author:
    - name: Author One
      affiliation: University of Somewhere
    - name: Author Two
      affiliation: University of Nowhere
    date: &quot;`r format(Sys.time(), &#39;%d %B %Y&#39;)`&quot;
    tags: [nothing, nothingness]
    abstract: |
      This is the abstract.
    
      It consists of two paragraphs.
    output: pdf_document
    ---

I&#39;d also like to customize the heading a bit more and add a subtitle. Possible?

multiple authors and subtitles in Rmarkdown yaml

Consider the following trivial Dockerfile:



    FROM debian:testing
    RUN  adduser --disabled-password --gecos &#39;&#39; docker
    RUN  adduser --disabled-password --gecos &#39;&#39; bob 

in a working directory with nothing else. Build the docker image: 

    docker build -t test .

and then run a bash script on the container, linking the working directory into a new subdir on bob&#39;s home directory:

    docker run --rm -it -v $(pwd):/home/bob/subdir test 

Who owns the contents of `subdir` on the container? On the container, run:
    
    cd /home/bob/subdir
    ls -l

ad we see:

    -rw-rw-r-- 1 docker docker 120 Oct 22 03:47 Dockerfile

Holy smokes! `docker` owns the contents!  Back on the host machine outside the container, we see that our original user still owns the `Dockerfile`. Let&#39;s try and fix the ownership of `bob`&#39;s home directory. On the container, run:

    chown -R bob:bob /home/bob
    ls -l 

and we see: 

    -rw-rw-r-- 1 bob bob 120 Oct 22 03:47 Dockerfile

But wait! outside the container, we now run `ls -l`

    -rw-rw-r-- 1 1001 1001 120 Oct 21 20:47 Dockerfile

we no longer own our own file.  Terrible news!  

----------

If we had only added one user in the above example, everything would have gone more smoothly.  For some reason, Docker seems to be making any home directory owned by the _first_ non-root user it encounters (even if that user is declared on an earlier image).  Likewise, this _first_ user is the one that corresponds to the same ownership permissions as my home user. 

**Question 1** Is that correct?  Can someone point me to documentation of this, I&#39;m just conjecturing based on the above experiment. 

**Question 2**: Perhaps this is just because they both have the same numerical value on the kernel, and if I tested on a system where my home user was not id `1000` then permissions would get changed in every case?

**Question 3**: The real question is, of course, &#39;what do I do about this?&#39; If `bob` is logged in as `bob` on the given host machine, he should be able to run the container as `bob` and not have file permissions altered under his host account.  As it stands, he actually needs to run the container as user `docker` to avoid having his account altered.  


I hear you asking _Why do I have such a weird Dockerfile anyway?_. I wonder too sometimes. I am writing a container for a webapp (RStudio-server) that permits different users to log in, which simply uses the user names and credentials from the linux machine as the valid user names.  This brings me the perhaps unusual motivation of wanting to create multiple users.  I can get around this by creating the user only at runtime and everthing is fine.  However, I use a base image that has added a single `docker` user so that it can be used interactively without running as root (as per best practice).  This ruins everything since that user becomes the _first_ user and ends up owning everything, so attempts to log on as other users fail (the app cannot start because it lacks write permissions).  Having the startup script run `chown` first solves this issue, but at the cost of linked volumes changing permissions (obviously only a problem if we are linking volumes).  

Content Type	Original Author	Original Content on Stackoverflow
Question	user3654852	View Question on Stackoverflow
Solution 1 - R	mnel	View Answer on Stackoverflow
Solution 2 - R	dpritch	View Answer on Stackoverflow
Solution 3 - R	Smart D	View Answer on Stackoverflow
Solution 4 - R	pbertens	View Answer on Stackoverflow

How do I open a script file in RStudio using an R command?

R Problem Overview

R Solutions

Solution 1 - R

Solution 2 - R

Solution 3 - R

Solution 4 - R

In f(x), can x be evaluated before f?

What happens if an alert window is shown during an ajax call?

Attributions