[vtkusers] vtkMath::LUFactorLinearSystem

[Adriano Gagliardi]

Excellent! Thanks for that, David. 

Yes, it would be nice if the interface was more similar in functionality to
the Ublas libraries provided with Boost. I'd be happy to vote for that.

Cheers,

Adriano


===================================

Adriano Gagliardi MEng PhD
Project Scientist
Computational Aerodynamics
Aircraft Research Association Ltd.
Manton Lane
Bedford

Tel: 01234 32 4644
E-mail: agagliardi at ara.co.uk
Url: www.ara.co.uk 
-----Original Message-----
From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On Behalf
Of David Doria
Sent: 23 November 2009 13:15
Cc: vtkusers at vtk.org
Subject: Re: [vtkusers] vtkMath::LUFactorLinearSystem

On Mon, Nov 23, 2009 at 7:47 AM, Adriano Gagliardi <agagliardi at ara.co.uk>
wrote:
> Dear All,
>
> I'd like to use vtk's implementation of LU factorisation, but I am not 
> sure how to prepare the type of argument it requires. The function header
is:
>
> int vtkMath::LUFactorLinearSystem( double **A, int *index, int size, 
> double *tmpSize );
>
> The issue is the first argument, double **A, which I believe is a list 
> of pointers to pointers to doubles? Is this correct? Can someone 
> provide an example of how to construct this so that it could be used 
> as input into the function, please?
>
> Regards,
>
> Adriano
>
>
> ===================================
>
> Adriano Gagliardi MEng PhD

The interfaces to vtkMath functions are quite "old school. Here is an
example and a nice helper function to create a matrix in a civilized
way:
http://www.cmake.org/Wiki/Quadric_Surface_Fitting

The create_matrix function is what I'm referring to.

Please vote to include a function like this in VTK and revamp the vtkMatrix
function interfaces:
http://vtk.uservoice.com/pages/31508-general/suggestions/369820-create-a-mat
rix-class-and-use-it-for-vtkmath-function-interfaces?ref=title

Thanks,

David
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