[R] R and C++ compared with only C++

[Liaw, Andy]

I must say that I agree with Andrew.  I recently did just that:  took an R
package with C code and turn it into a stand-alone C program.  Granted I'm
far from being a C expert, but not only that the code didn't run any faster
(because all the heavy computations were already done in C anyway), but I
had to spend lots and lots of time debugging the new code.  If I have the
choice, I wouldn't do it.  (No, I didn't have that choice...)

Cheers,
Andy

> -----Original Message-----
> From: Andrew C. Ward [mailto:s195404 at student.uq.edu.au] 
> Sent: Monday, July 21, 2003 10:20 PM
> To: fjmolina at lbl.gov
> Cc: r-help
> Subject: Re: [R] R and C++ compared with only C++
> 
> 
> As always, it depends on your priorities and motivation. If 
> that extra 10% is important and if you can be bothered 
> writing the C++, then putting the whole thing into C++ may be 
> worth it. If not then you could let R deal with the input and output.
> 
> Regards,
> 
> Andrew C. Ward
> 
> CAPE Centre
> Department of Chemical Engineering
> The University of Queensland
> Brisbane Qld 4072 Australia
> andreww at cheque.uq.edu.au
> 
> 
> Quoting Francisco J Molina <fjmolina at lbl.gov>:
> 
> > 
> > My computer is a pentium 4 running at 2.4 GHz.
> > My R is 1.7.1
> > 
> > I have written a program in R that calls C++. The program 
> spends most 
> > of the time in C++ ( > 90% ). R basically deals with output and
> > input.
> > How slower can this be compared with the program I would
> > get from rewriting
> > everything in C++?
> > 
> > Thank you.
> > 
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> >
> 
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