Module 2 exercise 2

31b2d399 · boulanlo · 6bc83479 · 31b2d399
Commit 31b2d399 authored Oct 14, 2020 by boulanlo
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--- a/module2/exo2/exercice_R_en.org
+++ b/module2/exo2/exercice_R_en.org
-#+TITLE:  Your title
+#+TITLE:  Computing numerical values
-#+AUTHOR: Your name
+#+AUTHOR: Louis Boulanger
-#+DATE:   Today's date
+#+DATE:   October 14th 2020
 #+LANGUAGE: en
 # #+PROPERTY: header-args :eval never-export
@@ -11,71 +11,150 @@
 #+HTML_HEAD: <script type="text/javascript" src="http://www.pirilampo.org/styles/lib/js/jquery.stickytableheaders.js"></script>
 #+HTML_HEAD: <script type="text/javascript" src="http://www.pirilampo.org/styles/readtheorg/js/readtheorg.js"></script>
-* Some explanations
+* Data :noexport:
+#+Begin_src R :session *R* :exports none
+data <- c(14.0, 7.6, 11.2, 12.8, 12.5, 9.9, 14.9, 9.4, 16.9, 10.2, 14.9, 18.1, 7.3, 9.8, 10.9,12.2, 9.9, 2.9, 2.8, 15.4, 15.7, 9.7, 13.1, 13.2, 12.3, 11.7, 16.0, 12.4, 17.9, 12.2, 16.2, 18.7, 8.9, 11.9, 12.1, 14.6, 12.1, 4.7, 3.9, 16.9, 16.8, 11.3, 14.4, 15.7, 14.0, 13.6, 18.0, 13.6, 19.9, 13.7, 17.0, 20.5, 9.9, 12.5, 13.2, 16.1, 13.5, 6.3, 6.4, 17.6, 19.1, 12.8, 15.5, 16.3, 15.2, 14.6, 19.1, 14.4, 21.4, 15.1, 19.6, 21.7, 11.3, 15.0, 14.3, 16.8, 14.0, 6.8, 8.2, 19.9, 20.4, 14.6, 16.4, 18.7, 16.8, 15.8, 20.4, 15.8, 22.4, 16.2, 20.3, 23.4, 12.1, 15.5, 15.4, 18.4, 15.7, 10.2, 8.9, 21.0)
+#+End_src
-This is an org-mode document with code examples in R.  Once opened in
+#+RESULTS:
-Emacs, this document can easily be exported to HTML, PDF, and Office
+|   14 |
-formats. For more information on org-mode, see
+|  7.6 |
-https://orgmode.org/guide/.
+| 11.2 |
+| 12.8 |
-When you type the shortcut =C-c C-e h o=, this document will be
+| 12.5 |
-exported as HTML. All the code in it will be re-executed, and the
+|  9.9 |
-results will be retrieved and included into the exported document. If
+| 14.9 |
-you do not want to re-execute all code each time, you can delete the #
+|  9.4 |
-and the space before ~#+PROPERTY:~ in the header of this document.
+| 16.9 |
+| 10.2 |
-Like we showed in the video, R code is included as follows (and is
+| 14.9 |
-exxecuted by typing ~C-c C-c~):
+| 18.1 |
+|  7.3 |
-#+begin_src R :results output :exports both
+|  9.8 |
-print("Hello world!")
+| 10.9 |
-#+end_src
+| 12.2 |
+|  9.9 |
+|  2.9 |
+|  2.8 |
+| 15.4 |
+| 15.7 |
+|  9.7 |
+| 13.1 |
+| 13.2 |
+| 12.3 |
+| 11.7 |
+|   16 |
+| 12.4 |
+| 17.9 |
+| 12.2 |
+| 16.2 |
+| 18.7 |
+|  8.9 |
+| 11.9 |
+| 12.1 |
+| 14.6 |
+| 12.1 |
+|  4.7 |
+|  3.9 |
+| 16.9 |
+| 16.8 |
+| 11.3 |
+| 14.4 |
+| 15.7 |
+|   14 |
+| 13.6 |
+|   18 |
+| 13.6 |
+| 19.9 |
+| 13.7 |
+|   17 |
+| 20.5 |
+|  9.9 |
+| 12.5 |
+| 13.2 |
+| 16.1 |
+| 13.5 |
+|  6.3 |
+|  6.4 |
+| 17.6 |
+| 19.1 |
+| 12.8 |
+| 15.5 |
+| 16.3 |
+| 15.2 |
+| 14.6 |
+| 19.1 |
+| 14.4 |
+| 21.4 |
+| 15.1 |
+| 19.6 |
+| 21.7 |
+| 11.3 |
+|   15 |
+| 14.3 |
+| 16.8 |
+|   14 |
+|  6.8 |
+|  8.2 |
+| 19.9 |
+| 20.4 |
+| 14.6 |
+| 16.4 |
+| 18.7 |
+| 16.8 |
+| 15.8 |
+| 20.4 |
+| 15.8 |
+| 22.4 |
+| 16.2 |
+| 20.3 |
+| 23.4 |
+| 12.1 |
+| 15.5 |
+| 15.4 |
+| 18.4 |
+| 15.7 |
+| 10.2 |
+|  8.9 |
+|   21 |
+* Mean
+The mean of the dataset is computed in R with the =mean= function:
+#+Begin_src R :session *R* :exports both :results output
+mean(data)
+#+End_src
 #+RESULTS:
-: [1] "Hello world!"
+: [1] 14.113
-And now the same but in an R session. This is the most frequent
+* Minimum and maximum
-situation, because R is really an interactive language. With a
+The minimum is computed using =min=, and the maximum with =max=.
-session, R's state, i.e. the values of all the variables, remains
-persistent from one code block to the next. The code is still executed
-using ~C-c C-c~.
-#+begin_src R :results output :session *R* :exports both
+#+Begin_src R :session *R* :exports both :results output
-summary(cars)
+min(data)
-#+end_src
+max(data)
+#+End_src
 #+RESULTS:
-:      speed           dist       
+: [1] 2.8
-:  Min.   : 4.0   Min.   :  2.00  
+: [1] 23.4
-:  1st Qu.:12.0   1st Qu.: 26.00  
-:  Median :15.0   Median : 36.00  
-:  Mean   :15.4   Mean   : 42.98  
-:  3rd Qu.:19.0   3rd Qu.: 56.00  
-:  Max.   :25.0   Max.   :120.00
-Finally, an example for graphical output:
+* Median and standard deviation
-#+begin_src R :results output graphics :file "./cars.png" :exports results :width 600 :height 400 :session *R* 
+The median is computed with =median=:
-plot(cars)
-#+end_src
-#+RESULTS:
+#+Begin_src R :session *R* :exports both :results output
-[[file:./cars.png]]
+median(data)
+#+End_src
-Note the parameter ~:exports results~, which indicates that the code
+#+RESULTS:
-will not appear in the exported document. We recommend that in the
+: [1] 14.5
-context of this MOOC, you always leave this parameter setting as
-~:exports both~, because we want your analyses to be perfectly
-transparent and reproducible.
-Watch out: the figure generated by the code block is /not/ stored in
+The standard deviation is computed with =sd=:
-the org document. It's a plain file, here named ~cars.png~. You have
-to commit it explicitly if you want your analysis to be legible and
-understandable on GitLab.
-Finally, don't forget that we provide in the resource section of this
+#+Begin_src R :session *R* :exports both :results output
-MOOC a configuration with a few keyboard shortcuts that allow you to
+sd(data)
-quickly create code blocks in R by typing ~<r~ or ~<R~ followed by
+#+End_src
-~Tab~.
-Now it's your turn! You can delete all this information and replace it
+#+RESULTS:
-by your computational document.
+: [1] 4.334094