[Rcpp-devel] Compilation without libR.so ?

[Romain Francois]

Le 14 juin 2013 à 10:40, Martin Jakt <mjakt at z2.keio.jp> a écrit :

> Hi Romain (?),
> 
> thanks for your quick reply,
> 
>> 
>> Why do you want that. R CMD essentially takes care all of the details,
>> cooks a Makefile, runs it ... transparently. It never needs to be a
>> concern.
>> You can gain some control by using the Makevars, etc ...
> 
> I might be doing it wrong, but I'm using:
> 
> R CMD check pkgName
> 
> which has two inconveniences:
> 
> 1. It's slow

Perhaps look into devtools which might help you with the process. 

> 2. The compilation output gets put into a log file.
> 
> This is mostly a pain when removing all sorts of typos and stupid mistakes. I 
> also use colorgcc to colour output which makes things much easier to read.
> 
> I did look for a R CMD COMPILE, R CMD make
> 
> (eg. R CMD make -f Makevars), but got, 'Nothing to be done'.
> 
> I presume there's a better way, but for just making sure that the code 
> compiles I've not found anything better.
> 
>> 
>> I have a plan for a documentation website. but it is not ready.
>> Coming close is Dirk's doxygen digested documentation:
>> http://dirk.eddelbuettel.com/code/rcpp/html/index.html
>> 
>> This might help you, it might not. It is a matter of taste. For
>> example, I don't like it so much.
> 
> Wonderful. It seems to be pretty much what I'm looking for. Could perhaps do 
> with a little more textual description, but it is at least a good place to 
> start. Look forward to seeing your website as well.. 
> 
>>> Not really an ideal situation. For example, looking at the
>>> GenericVector class, I was surprised to find push_front suggesting
>>> that it
>>> doesn't quite mimic the STL vector class, which I believe guarantees
>>> that the
>>> memory is allocated in a contiguous block (possible to combine with
>>> push_front
>>> and push_back, but with some difficulty).
>> 
>> Those are somehow cosmetic additions. The usual suggestion is not to
>> use push_front and push_back on Rcpp types.
>> 
>> We use R's memory, and in R, resizing a vector means moving the data.
>> So if you push_back 3 times, you're moving the data 3 times.
>> 
>> Using R own memory is the best ever decision we made in Rcpp. You can
>> always use your own data structures to accumulate data, perhaps using
>> stl types and then convert back to R types, which is something we make
>> easy to do.
> 
> that's pretty much what I'm doing; though it's rather tempting to use R Matrix 
> slicing commands.
> 
> thanks!
> 
> Martin
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