From bhh at xs4all.nl  Mon Mar  7 19:43:37 2016
From: bhh at xs4all.nl (Berend Hasselman)
Date: Mon, 7 Mar 2016 19:43:37 +0100
Subject: [Rd] ALLOCATE in a FORTRAN subroutine
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Message-ID: <17E8BAB1-EFAC-4B3A-A2BC-E40A007A9118@xs4all.nl>


> On 7 Mar 2016, at 18:55, Berend Hasselman <bhh at xs4all.nl> wrote:
> 
>> 
>> On 7 Mar 2016, at 16:45, MAURICE Jean - externe <jean-externe.maurice at edf.fr> wrote:
>> 
>> Hi Martyn,
>> 
>> Many thanks for your answer. If I make it short : 
>> we can, once we know how to do it, 'drive' R from within FORTRAN for example to do a 
>> Myarray = seq(0, mydimension) 
>> in R once we have compute mydimension in FORTRAN. Is that correct ?
> 
> I too do not understand what you mean by this.
> 
> I told you on the R-help mailing list that what you could do is to 
> 
> - write a subroutine that calculates the required dimension given your parameters; you can do this within R code.

Correction: write a subroutine in Fortran that calculates the required dimension(s), call that routine from within R and make it return the required dimension(s).

etc.etc.

Berend

> - allocate in R (or C) a matrix/vector/.. with the required dimension.
> - call your Fortran subroutine(s) with the allocated matrix/vector
> 
> There are several packages, as I replied before on the R help list,  that do this (from within an R function or a C function).
> 
> 
> Berend
> 
>> If yes : it's too 'complicated' for the time I am hired (I mean I have been hired to do FORTRAN code not to learn R !).
>> 
>> Second question : for what I have understood in r_exts, it's more 'efficient' to translate R routines in C rather than in FORTRAN (speed must be the 'same', but there are a lot more possibilities in C for the programmer) : right ? I do not know why my customer (client ?) wanted to translate some R routines in FORTRAN. May be it's by accident (in my humble opinion they even don't know about C). If you confirm this fact, I'll speak about C with my customer because we are at the very beginning of great works (great amounts of work ?) and I don't matter, I am also a skilled C programmer !!
>> 
>> I hope you understand what I want to say, english is not my natural language !
>> 
>> Thanks again and best regards.
>> Jean
>> 
>> 
>> 
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[Rd] ALLOCATE in a FORTRAN subroutine
Berend Hasselman