|
»
»
»
« Return to Thread: typemaps in R
Re: typemaps in R
by Bastian Angermann
::
Rate this Message:
On Tue, 06 May 2008 05:18:04 +0200 Soeren Sonnenburg wrote:
> On Tue, 2008-05-06 at 00:50 +0200, Bastian Angermann wrote:
> > Hi,
> >
> > the typemaps for mapping unsigned int to an appropriate type in
> > R seem to be broken.
>
> Yeah well R does not have anything except bool, integer, double - so
> this mapping is quite arbitrary / IMHO unclear what should be done.
>
> > I am trying to wrap a class with constructor
> > Erdos_Renyi_Network(unsigned int ng, double af,double prob);
> > Calling network <- Erdos_Renyi_Network(ng=10,af=0.5,p=0.1) results in:
> > Error in Erdos_Renyi_Network(ng = 10, af = 0.5, p = 0.1) :
> > REAL() can only be applied to a 'numeric', not a 'integer'
>
> BTW, would it work when you used an int instead of an unsigned int?
Yes it is working for int. In R we have the typemap
%typemap(scoercein) int, int *, int &
%{ $input = as($input, "integer"); %}
and on the C side of things
INTEGER(ng)[0]
> > Could this be fixed by changing line 45,46 in rtypes.swg to
> > %typemap(scoercein) unsigned int, unsigned int *, unsigned int &
> > %{ $input = as($input, "numeric"); %} ?
> > This removes be cast to "integer" done in R and things seem to work,
> > but I don't know if I am introducing other bugs by this "fix".
>
> In my eyes this cast is broken anyway... just consider $input is a
> matrix, doing as($input, ... ) will turn it into a vector. I tend to say
> that that the code doing the REAL(ng)[0] should be changed to generate a
> INTEGER(ng)[0] and that this scoercein typemap shouldn't do anythin,
> i.e. %{ %} .
>
I don't think this will solve all problems, when going in the other direction (C->R) starting with an unsigned int => 2^31 a cast to "integer" will not have the desired result.
Bastian
--
Psssst! Schon vom neuen GMX MultiMessenger gehört?
Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger
-------------------------------------------------------------------------
This SF.net email is sponsored by the 2008 JavaOne(SM) Conference
Don't miss this year's exciting event. There's still time to save $100.
Use priority code J8TL2D2.
http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone
_______________________________________________
Swig-user mailing list
Swig-user@...
https://lists.sourceforge.net/lists/listinfo/swig-user
> On Tue, 2008-05-06 at 00:50 +0200, Bastian Angermann wrote:
> > Hi,
> >
> > the typemaps for mapping unsigned int to an appropriate type in
> > R seem to be broken.
>
> Yeah well R does not have anything except bool, integer, double - so
> this mapping is quite arbitrary / IMHO unclear what should be done.
>
> > I am trying to wrap a class with constructor
> > Erdos_Renyi_Network(unsigned int ng, double af,double prob);
> > Calling network <- Erdos_Renyi_Network(ng=10,af=0.5,p=0.1) results in:
> > Error in Erdos_Renyi_Network(ng = 10, af = 0.5, p = 0.1) :
> > REAL() can only be applied to a 'numeric', not a 'integer'
>
> BTW, would it work when you used an int instead of an unsigned int?
Yes it is working for int. In R we have the typemap
%typemap(scoercein) int, int *, int &
%{ $input = as($input, "integer"); %}
and on the C side of things
INTEGER(ng)[0]
> > Could this be fixed by changing line 45,46 in rtypes.swg to
> > %typemap(scoercein) unsigned int, unsigned int *, unsigned int &
> > %{ $input = as($input, "numeric"); %} ?
> > This removes be cast to "integer" done in R and things seem to work,
> > but I don't know if I am introducing other bugs by this "fix".
>
> In my eyes this cast is broken anyway... just consider $input is a
> matrix, doing as($input, ... ) will turn it into a vector. I tend to say
> that that the code doing the REAL(ng)[0] should be changed to generate a
> INTEGER(ng)[0] and that this scoercein typemap shouldn't do anythin,
> i.e. %{ %} .
>
I don't think this will solve all problems, when going in the other direction (C->R) starting with an unsigned int => 2^31 a cast to "integer" will not have the desired result.
Bastian
--
Psssst! Schon vom neuen GMX MultiMessenger gehört?
Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger
-------------------------------------------------------------------------
This SF.net email is sponsored by the 2008 JavaOne(SM) Conference
Don't miss this year's exciting event. There's still time to save $100.
Use priority code J8TL2D2.
http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone
_______________________________________________
Swig-user mailing list
Swig-user@...
https://lists.sourceforge.net/lists/listinfo/swig-user
« Return to Thread: typemaps in R
| Free Forum Powered by Nabble | Forum Help |