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 ? 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 -------------- next part -------------- Ce message et toutes les pi?ces jointes (ci-apr?s le 'Message') sont ?tablis ? l'intention exclusive des destinataires et les informations qui y figurent sont strictement confidentielles. Toute utilisation de ce Message non conforme ? sa destination, toute diffusion ou toute publication totale ou partielle, est interdite sauf autorisation expresse. Si vous n'?tes pas le destinataire de ce Message, il vous est interdit de le copier, de le faire suivre, de le divulguer ou d'en utiliser tout ou partie. Si vous avez re?u ce Message par erreur, merci de le supprimer de votre syst?me, ainsi que toutes ses copies, et de n'en garder aucune trace sur quelque support que ce soit. Nous vous remercions ?galement d'en avertir imm?diatement l'exp?diteur par retour du message. Il est impossible de garantir que les communications par messagerie ?lectronique arrivent en temps utile, sont s?curis?es ou d?nu?es de toute erreur ou virus. ____________________________________________________ This message and any attachments (the 'Message') are intended solely for the addressees. The information contained in this Message is confidential. Any use of information contained in this Message not in accord with its purpose, any dissemination or disclosure, either whole or partial, is prohibited except formal approval. If you are not the addressee, you may not copy, forward, disclose or use any part of it. If you have received this message in error, please delete it and all copies from your system and notify the sender immediately by return message. E-mail communication cannot be guaranteed to be timely secure, error or virus-free.
Hi,
"we can, once we know how to do it, 'drive' R from within
FORTRAN"
I am not sure I understand what you mean by this ...
You can call routines written in Fortran or C from within R - how easy this is
depends on the interfaces to those routines.
You can call (some) R functionality from C (see for example
http://quantitative-ecology.blogspot.co.uk/2008/11/call-c-from-r-and-r-from-c.html).
As you can call C from within Fortran, it is obviously possible also call R from
within Fortran, but it is not something I have done so have no idea how much
work is required to do that.
"for what I have understood in r_exts, it's more 'efficient' to
translate R routines in C rather than in FORTRAN"
As far as I aware the R API for writing extensions etc is only available in C
and there isn't a Fortran equivalent, so I guess it would be more
"efficient" / easier in that sense as that would be one less level of
cross-language programming you would have to worry about.
"I do not know why my customer (client ?) wanted to translate some R
routines in FORTRAN."
Which language is preferred really boils down to personal preference and I am
going to be slightly biased as I do almost all my numerical computing in
Fortran. There is a good argument that Fortran is the most natural fit for
numerical computing with its built in syntax to deal with complex numbers,
matrices, array slicing, array operations etc. In theory this gives compilers a
good base to optimise from. The more restrictive nature of Fortran does make it
more difficult to interface with other languages than C (but conversely makes it
much more difficult to shoot yourself in the foot - and the Fortran compilers
tend to pick up more problems at compile time than the C ones).
Martyn
-----Original Message-----
From: MAURICE Jean - externe [mailto:jean-externe.maurice at edf.fr]
Sent: 07 March 2016 15:46
To: Martyn Byng <martyn.byng at nag.co.uk>
Cc: r-devel at r-project.org
Subject: RE: ALLOCATE in a FORTRAN subroutine
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 ?
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
________________________________________________________________________
This e-mail has been scanned for all viruses by Star.\ _...{{dropped:16}}
> 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. - 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 > > > > Ce message et toutes les pi?ces jointes (ci-apr?s le 'Message') sont ?tablis ? l'intention exclusive des destinataires et les informations qui y figurent sont strictement confidentielles. Toute utilisation de ce Message non conforme ? sa destination, toute diffusion ou toute publication totale ou partielle, est interdite sauf autorisation expresse. > > Si vous n'?tes pas le destinataire de ce Message, il vous est interdit de le copier, de le faire suivre, de le divulguer ou d'en utiliser tout ou partie. Si vous avez re?u ce Message par erreur, merci de le supprimer de votre syst?me, ainsi que toutes ses copies, et de n'en garder aucune trace sur quelque support que ce soit. Nous vous remercions ?galement d'en avertir imm?diatement l'exp?diteur par retour du message. > > Il est impossible de garantir que les communications par messagerie ?lectronique arrivent en temps utile, sont s?curis?es ou d?nu?es de toute erreur ou virus. > ____________________________________________________ > > This message and any attachments (the 'Message') are intended solely for the addressees. The information contained in this Message is confidential. Any use of information contained in this Message not in accord with its purpose, any dissemination or disclosure, either whole or partial, is prohibited except formal approval. > > If you are not the addressee, you may not copy, forward, disclose or use any part of it. If you have received this message in error, please delete it and all copies from your system and notify the sender immediately by return message. > > E-mail communication cannot be guaranteed to be timely secure, error or virus-free. > ______________________________________________ > R-devel at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel
> 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 >> >> >> >> Ce message et toutes les pi?ces jointes (ci-apr?s le 'Message') sont ?tablis ? l'intention exclusive des destinataires et les informations qui y figurent sont strictement confidentielles. Toute utilisation de ce Message non conforme ? sa destination, toute diffusion ou toute publication totale ou partielle, est interdite sauf autorisation expresse. >> >> Si vous n'?tes pas le destinataire de ce Message, il vous est interdit de le copier, de le faire suivre, de le divulguer ou d'en utiliser tout ou partie. Si vous avez re?u ce Message par erreur, merci de le supprimer de votre syst?me, ainsi que toutes ses copies, et de n'en garder aucune trace sur quelque support que ce soit. Nous vous remercions ?galement d'en avertir imm?diatement l'exp?diteur par retour du message. >> >> Il est impossible de garantir que les communications par messagerie ?lectronique arrivent en temps utile, sont s?curis?es ou d?nu?es de toute erreur ou virus. >> ____________________________________________________ >> >> This message and any attachments (the 'Message') are intended solely for the addressees. The information contained in this Message is confidential. Any use of information contained in this Message not in accord with its purpose, any dissemination or disclosure, either whole or partial, is prohibited except formal approval. >> >> If you are not the addressee, you may not copy, forward, disclose or use any part of it. If you have received this message in error, please delete it and all copies from your system and notify the sender immediately by return message. >> >> E-mail communication cannot be guaranteed to be timely secure, error or virus-free. >> ______________________________________________ >> R-devel at r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel > > ______________________________________________ > R-devel at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel
> You can call (some) R functionality from CWhen I read about 'R api' I thought that we could call all the functionality of R. I think that in the windows world, this is called OLE automation. From a pure programmer point of view, it is very convenient and my customer is creating a team of programmers. But, if only 'some' functionalities can be called, it's not so useful. So we'll stick with FORTRAN (I mean I don't want to make revolution). Jean -------------- next part -------------- Ce message et toutes les pi?ces jointes (ci-apr?s le 'Message') sont ?tablis ? l'intention exclusive des destinataires et les informations qui y figurent sont strictement confidentielles. Toute utilisation de ce Message non conforme ? sa destination, toute diffusion ou toute publication totale ou partielle, est interdite sauf autorisation expresse. Si vous n'?tes pas le destinataire de ce Message, il vous est interdit de le copier, de le faire suivre, de le divulguer ou d'en utiliser tout ou partie. Si vous avez re?u ce Message par erreur, merci de le supprimer de votre syst?me, ainsi que toutes ses copies, et de n'en garder aucune trace sur quelque support que ce soit. Nous vous remercions ?galement d'en avertir imm?diatement l'exp?diteur par retour du message. Il est impossible de garantir que les communications par messagerie ?lectronique arrivent en temps utile, sont s?curis?es ou d?nu?es de toute erreur ou virus. ____________________________________________________ This message and any attachments (the 'Message') are intended solely for the addressees. The information contained in this Message is confidential. Any use of information contained in this Message not in accord with its purpose, any dissemination or disclosure, either whole or partial, is prohibited except formal approval. If you are not the addressee, you may not copy, forward, disclose or use any part of it. If you have received this message in error, please delete it and all copies from your system and notify the sender immediately by return message. E-mail communication cannot be guaranteed to be timely secure, error or virus-free.