Re: [ublas] novice question. how to use ublas bindings

Subject: Re: [ublas] novice question. how to use ublas bindings
From: Luca Sbardella (luca_at_[hidden])
Date: 2009-08-20 13:19:56

Understand, thanks for help.
The stable versions works.
I could give some help if needed. What is the trunk version trying to
achieve?
Luca

2009/8/20 Rutger ter Borg <rutger_at_[hidden]>

>
> Luca Sbardella wrote:
>
> > I got the binding from the boost sandbox
> >
> >
>
> http://svn.boost.org/svn/boost/sandbox/numeric_bindings/boost/numeric/bindings/
> >
> > I'm trying to see if I can use them the to solve an eigenvalue problem
> > within uBlas.
> > How do I call the bindings?
> >
> > I tried to compile the file in
> >
>
> http://svn.boost.org/svn/boost/sandbox/numeric_bindings/libs/numeric/bindings/lapack/test/ublas_gees.cpp
> >
> > but it fails. It seems that is not compatible with the binding for two
> > reasons
> >
> > 1) the import
> >
> > <boost/numeric/bindings/lapack/gees.hpp>
> >
> >
> > is wrong. Should that be
> >
> > <boost/numeric/bindings/lapack/driver/gees.hpp>   ?
> >
> >
> > 2) How do I call the function gees? In the example above it fails.
> >
> > lapack::gees( a, e1, z, workspace ) ;
> >
> > It looks like the functions arguments are wrong. I assume the test is
> > based on an old version of the bindings.
> > In fact looking at the header file
> >
> >
>
> http://svn.boost.org/svn/boost/sandbox/numeric_bindings/boost/numeric/bindings/lapack/driver/gees.hpp
> >
> > the functions requires two extra arguments (char const jobvs, char const
> > sort).
> >
> > Any help would be appreciated.
> >
>
>
> Hello Luca,
>
> the bindings at sandbox/numeric_bindings are the "trunk" version, whereas
> sandbox/numeric_bindings-v1 are "stable"
>
> You could try the more stable version, or help us improve the trunk
> version.
>
> For the trunk version, you could try 'N' for jobvs, and 'N' for sort.
> Select
> is probably new, too, please try 0 for that one. If unsure about any
> arguments of a lapack driver functions, please check the manual of lapack
> itself. E.g., consult your function at
>
> http://www.netlib.org/lapack/double/
> http://www.netlib.org/lapack/complex/
>
> Cheers,
>
> Rutger
>
>
>
>
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>

-- 
Dr Luca Sbardella
Director
Dynamic Quant Ltd