dense matrix vs. SSOR

Hi, all,

I am trying to solve a linear system using dense matrix and SSOR 
precondioner. But I got compile errors:

c:\Program Files\Microsoft Visual Studio 
.NET\Vc7\include\mtl\oned_part.h(264): error C2039: 'nz_struct' : is not a 
member of 'mtl::external_vec<T,NN,SizeType>'
       with
       [
           
T=mtl::generic_dense2D<std::vector<double,std::allocator<double>>,mtl::refcnt_ptr<std::vector<double,std::allocator<double>>>,mtl::gen_rect_offset<0,0>,0,0>::elt_type,
           NN=0,
           SizeType=unsigned int
       ]


It seems that SSOR can only be used with sparse matrix (I don't have any 
problems with sparse matrix). Can anybody can tell me if I am right or 
wrong?

The other question is: can I copy a dense matrix to a sparse matrix? and 
how?

Thanks for your help.

chi


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