186 lines
4.1 KiB
Org Mode
186 lines
4.1 KiB
Org Mode
#+TITLE: Notes on “Babel: Introduction”
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#+AUTHOR: Daniel
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#+DATE: 2016-06-26
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Tutorial from http://orgmode.org/worg/org-contrib/babel/intro.html
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* Source Code Execution
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#+begin_src hy
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(print "Hello, There!")
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#+end_src
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#+RESULTS:
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: Hello, There!
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#+begin_src sh
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echo "This file takes up `du -h emacs-org-babel-tutorial.org | sed 's/\([0-9k]*\)[ ]*emacs-org-babel-tutorial.org/\1/'`"
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#+end_src
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#+RESULTS:
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: This file takes up 4.0K
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#+begin_src R :colnames yes
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words <- tolower(scan("emacs-org-babel-tutorial.org", what="", na.strings=c("|",":")))
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t(sort(table(words[nchar(words) > 3]), decreasing=TRUE)[1:10])
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#+end_src
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#+RESULTS:
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| #+begin_src | #+end_src | #+results: | date | plus | today's | :results | hello, | import | is") |
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|-------------+-----------+------------+------+------+---------+----------+--------+--------+------|
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| 5 | 5 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 2 |
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** Capturing the Results of Code Evaluation
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#+begin_src python :results value
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import time
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print("Hello, today's date is %s" % time.ctime())
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print("Two plus two is")
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return 2 + 2
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#+end_src
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#+RESULTS:
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: 4
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#+begin_src python :results output
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import time
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print("Hello, today's date is %s" % time.ctime())
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print("Two plus two is")
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2 + 2
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#+end_src
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#+RESULTS:
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: Hello, today's date is Sun Jun 26 16:04:36 2016
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: Two plus two is
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** Session-based Evaluation
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Have a look into /Emacs Speaks Statistics/
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** Arguments to Code Blocks
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#+name: square
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#+header: :var x = 0
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#+begin_src python
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return x*x
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#+end_src
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#+call: square(x=6)
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#+RESULTS:
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: 36
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#+tblname: fibonacci-inputs
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| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
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| 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 |
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#+name: fibonacci-seq
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#+begin_src emacs-lisp :var fib-inputs=fibonacci-inputs
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(defun fibonacci (n)
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(if (or (= n 0) (= n 1))
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n
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(+ (fibonacci (- n 1))
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(fibonacci (- n 2)))))
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(mapcar (lambda (row)
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(mapcar #'fibonacci row))
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fib-inputs)
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#+end_src
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#+RESULTS: fibonacci-seq
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| 1 | 1 | 2 | 3 | 5 | 8 | 13 | 21 | 34 | 55 |
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| 1 | 3 | 8 | 21 | 55 | 144 | 377 | 987 | 2584 | 6765 |
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** In-line Code Blocks
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In-line code can be call without header arguments (like so: src_sh{date}) or
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with header arguments (like so: src_python[:results value]{return 10 + 10}).
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** Code Block Body Expansion
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Preview: =C-c C-v v=, bound to =org-babel-expand-src-block=
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#+tblname: data
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| username | john-doe |
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| password | abc123 |
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#+begin_src emacs-lisp :var data=data
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(setq my-special-username (first (first data)))
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(setq my-special-password (first (second data)))
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#+end_src
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** A Meta-programming Language for Org-mode
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#+name: directories
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#+begin_src sh :results replace
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cd ~ && du -sc * | grep -v total
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#+end_src
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#+RESULTS: directories
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| 538604 | Desktop |
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| 77332656 | Documents |
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| 1206668 | Mail |
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| 8 | News |
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#+name: directory-pie-chart
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#+begin_src R :session R-pie-example :var dirs=directories
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pie(dirs[,1], labels = dirs[,2])
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#+end_src
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#+RESULTS: directory-pie-chart
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Note: the syntax =#+name: directory-pie-chart(dirs=directories)= did not work.
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** Using Code Blocks in Org Tables
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*** Example 1: Data Summaries Using R
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#+name: tbl-example-data
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#+begin_src R
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runif(n=5, min=0, max=1)
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#+end_src
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#+name: R-mean
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#+begin_src R :var x=""
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colMeans(x)
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#+end_src
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#+tblname: summaries
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| mean |
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|-------------------|
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| 0.574235895462334 |
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#+TBLFM: @2$1='(org-sbe "R-mean" (x "tbl-example-data()"))
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*** Example 2: Babel Test Suite
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/No notes/
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* The Library of Babel
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#+lob: square(x=6)
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Does not do what I expected …
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* Literate Programming
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#+name: hello-world-prefix
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#+begin_src sh :exports none
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echo "/-----------------------------------------------------------\\"
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#+end_src
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#+name: hello-world-postfix
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#+begin_src sh :exports none
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echo "\-----------------------------------------------------------/"
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#+end_src
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#+name: hello-world
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#+begin_src sh :tangle hello.sh :exports none :noweb yes
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<<hello-world-prefix>>
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echo "| hello world |"
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<<hello-world-postfix>>
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#+end_src
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Tangling with =C-c C-v t=.
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* Reproducible Research
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