Re: [Vxl-users] Vnl using non-vnl matrices/vectors?

[Ian S. <ian...@st...>]

Kris Thielemans wrote:
> Hi
> 
> I'm new to vxl, but am wondering if it would be possible to use some of the
> VNL routines with my own vector and matrix classes. I know, I'm asking too
> much...
> 
> I realise that this will involve some work but would like to ask for some
> suggestions. 
> 
> I suppose the easiest way to go would be to make sure that my classes
> provide the same interface as vnl_vector and vnl_matrix, and then typedef
> vnl_vector etc. Somewhat cleaner would be to derive vnl_vector from my
> classes from my own classes. Or some wrapper classes as suggested in
> Numerical Recipes for C++ 
> (see http://www.numerical-recipes.com/cpppages/chap1sel.pdf p.29 et al)

You can use vnl_vector_ref and vnl_matrix_ref to wrap an existing array 
of numbers in the types vnl expects. Alternatively, you could wrap the 
data of a vnl_vector in your own classes.

> A longer route (but in the end more satisfying) would be to template the vnl
> routines in terms of vector and matrix classes (which still need to have the
> correct interface). A lot of trouble with instanstations then of course.
Sounds horrendous.