[GiNaC-list] write access to entries of submatrices [Was: multi index storage of expressions]

[Sheplyakov Alexei]

On Mon, Feb 19, 2007 at 11:38:20PM -0300, Charlls Quarra wrote:

> ok i found that this awfully-looking hack does the
> job:
> 
> ( *(matrix*) & ex_to<matrix>(foo(0,1)) )(1,1) = 34;

Ugh, this is plain EVIL.

> im eager to find out what its the ginac-sanctioned way
> to do it though

As I explained in the previous mail, there is no way to assign anything
to references returned by ex_to<T>. If you really need multidimensional
arrays (and vector<matrix> or vector<vector<vector <ex> > > are not
good enough) then GiNaC is not proper tool for your task.

Best regards,
 Alexei

-- 
All science is either physics or stamp collecting.

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