[GiNaC-list] write access to entries of submatrices [Was: multi
index storage of expressions]
varg at theor.jinr.ru
Tue Feb 20 07:58:56 CET 2007
On Mon, Feb 19, 2007 at 11:38:20PM -0300, Charlls Quarra wrote:
> ok i found that this awfully-looking hack does the
> ( *(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.
All science is either physics or stamp collecting.
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