Hello,
Excellent initiative. That is going to be very interesting too for
complex stuff like loops and if() statements.
A couple of suggestions:
- In general, I would add corresponding R input and output just beneath
the "visual" display of what happens, so that readers can try it in R
and see what happens.
- P. 1, para. 1: ... have a common mode, one of character, logical, and
numeric (to match the order of visual items).
- P. 3, para. 4: The character mode always wins. Logical always looses.
- P. 5, para. 11: A little sentence explaining nchar() would be useful.
Something like: "Count the number of characters in each string:"
- P. 6, para. 14.1: again, a little explanation: "Matrices are filled by
columns by default :" ... "But you can change it :"
- P. 7, para. 14.2: "Matrices have two dimensions and you must provide
extractors for each of them. You first extract the rows, then the columns."
- P. 9: you use merge() that creates a list, before introducing what a
list is... This is confusing.
- P. 11, para. 16.1: you use regular expressions without introducing
what it is. No R beginner that has not done serious programming knows
what a "Regexp" is.
(P.S.: Juste après avoir écrit tout ceci, je me rend compte que tu
travailles à l'Université de Caen. Je suis passé par là: j'ai mis en
place les nouvelles infrastructures d'élevage d'oursins à la Station
Marine de Luc-sur-mer il y a une quinzaine d'années de cela.
Bon week-end,
Philippe Grosjean
..............................................<°}))><........
) ) ) ) )
( ( ( ( ( Prof. Philippe Grosjean
) ) ) ) )
( ( ( ( ( Numerical Ecology of Aquatic Systems
) ) ) ) ) Mons University, Belgium
( ( ( ( (
..............................................................
Sylvain Loiseau wrote:
Hello all,
Following a discussion at the end of december [1] I created a package "drawExpression" on
R-Forge. It is still in a very early stage! Here is a draft of a PDF "visual reference
card" that show the usage of the code:
https://r-forge.r-project.org/plugins/scmsvn/viewcvs.php/pkg/visualRefCard/visualRefCard.pdf?rev=3&root=drawexpression&view=log
Advices welcome!
Best,
Sylvain
[1] https://stat.ethz.ch/pipermail/r-devel/2009-December/056170.html
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