[R-sig-teaching] R exercices

[R. Michael Weylandt]

Sorry typo -- lapply(1:n, function(x) cat(rep("*",x),"\n"))


M


On Fri, Apr 20, 2012 at 10:45 AM, R. Michael Weylandt
<michael.weylandt at gmail.com> wrote:
> R is in the broad family of functional languages -- if your student is
> on board with the statistical capabilities of R, he might benefit from
> looking at one of the classic tutorials for those while doing the
> exercises in R. SICP is a classic, but the syntax doesn't match: maybe
> the python version works
> http://www-inst.eecs.berkeley.edu/~cs61a/sp12/book/index.html :
> alternatively, think Python or think Complexity (both online) provide
> another (less difficult) exposition. However, take these options with
> a grain of salt: if your student learns R this way, he'll get some bad
> R habits that will take a long time to break: I'd highly advise
> against any solution that suggests he do the
>
> *
> **
> ***
>
> puzzle with nested loops: performance in later programming assignments
> will be terrible. Better to learn good habits now: lapply(1:n,
> function(x) cat(rep("*", n), "\n")
>
> Alternatively, working through something like Project Euler in R will
> require a little more self-starting, but might be more rewarding after
> he masters the basics of syntax. (just what's given in a first read
> through the standard intro to R document)
>
> Finally, Matloff's Art of R programming is probably exactly what
> you're looking for, but isn't free.
>
> Hope this helps, (and my strong advice is options 2 or 3)
>
> Michael
>
> On Fri, Apr 20, 2012 at 10:05 AM, cgenolin <cgenolin at u-paris10.fr> wrote:
>> Thanks for your answer.
>>
>> Yes, it is quite different from what I am looking for which will be more
>> something like :
>>
>> --- 8< -----
>>
>> Exercice 1: wrote a function that compute the surface of a rectangle
>>
>> Exercice 2: wrote a function that compute factorial n (whithout using the
>> function factorial)
>>
>> Exercice 3: wrote a function, that given a n, will draw a triangle of "*".
>> Example with n=5
>>
>> *
>> **
>> ***
>> ****
>> *****
>>
>> --- 8< -----
>>
>> The first exemple is about writing a (very) simple function and returning
>> the result ; the second
>> need the use of a loop. The third will need two loops (for a beginer).
>>
>> And so on, on various topic.
>>
>> Christophe
>>
>>> Are you familiar with R Inferno? This is a programming-oriented
>>> tutorial for R by the statistician Patric Burns. He has generously
>>> placed it as a pdf online for free
>>> (http://www.burns-stat.com/pages/Tutor/R_inferno.pdf [4]); you could
>>>
>>> also
>>> purchase a copy. Of course this will be more than just a few practice
>>> exercises (a lot more, and actually, I'm not sure there are any
>>> exercises but you can certainly follow along with the examples).
>>> Nonetheless, it may still be right up your alley. There are other
>>> resources for learning the programming side of R, but only a few that
>>> are as good, and none other free, so far as I know. If this is really
>>> different from what you're looking for, you may want to reply with more
>>> detail.
>>>
>>> Hope that helps. -Jeff
>>>
>>> On 4/20/2012 7:41 AM, cgenolin wrote:
>>>
>>>> Hi the list, I am looking for some exercices for a PhD student that
>>>> start to learn R. He already "read" some tutorial, but now he needs
>>>> some practice. He does *not* need to learn any statistical tools ; he
>>>> just needs to work on programmation concept. So I am looking for some
>>>> exercice sheet that will, for example, focus on : - structuring the
>>>> data (data.frame / list / matrix / ...) - using controle syntax (for /
>>>> if / while / function) - reading data - ... Any link for this kind of
>>>> material? Sincerely Christophe [[alternative HTML version deleted]]
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>>
>>
>>
>> Links:
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