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(This article was first published on <strong><a href="http://msperlin.github.io/2017-02-10-Shiny_Exams/"> R and Finance</a></strong>, and kindly contributed to <a rel="nofollow" href="https://www.r-bloggers.com/">R-bloggers)</a> </div>
<p> Serving book exercises in the web with Shiny and Exams – </p>
<p>As you may know, I recently published a <a target="_blank" rel="nofollow" href="https://www.amazon.com/dp/8592243513">R book in amazon</a>.<br>
I decided to keep R exercises out of the book and serve them freely over the web. This was not a difficult decision since I’m still writing and revising all questions. My experience tell me that <strong>good</strong> exercises requires time to develop and I didn’t want to rush it just for the sake of publishing the book.</p>
<p>I’m a big fan of package Exams and, given that I already have some questions about R in this format, I should use it to build the exercises for my book. The reader is better served than using a <em>single version format</em> as he/she can rebuild a different set of exercises each time, and take the same set of exercises over and over, if needed. The problem is that building a new exam in package Exams requires R and latex compilation. I could compile in my computer and provide pdf files of different versions in the website, but this is not really an elegant solution.</p>
<p>With that in mind, I was able to write a shiny app that distributes pdf files in the internet. I customized all templates so that they fit my needs. I have never seen anything like that, which is why I am posting it here. I’m still amazed of how much a few lines of code in Shiny can do.</p>
<p>The users can choose the chapter and the language. After clicking the “build” button, a custom call to <code>exams2pdf</code> is made and the user can download a zip file with the contents of the exercises.</p>
<p>Give it a try <a target="_blank" rel="nofollow" href="https://msperlin.shinyapps.io/book_exercises/">here</a>.</p>
<p>Curious about the code? All files are available in <a target="_blank" rel="nofollow" href="https://github.com/msperlin/Book-Exercises">github</a>.</p>
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<div>To <strong>leave a comment</strong> for the author, please follow the link and comment on their blog: <strong><a href="http://msperlin.github.io/2017-02-10-Shiny_Exams/"> R and Finance</a></strong>.</div>
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