CGAL users discussion list

Hi,
until now I was using the CGAL 3.9 version with the TAUCS library in order
to solve a large sparse system. As recommended in the installation manual
I replaced TAUCS with Eigen in the 4.0 version.
I need to write end read some auxiliary matrices in order to build the
final large matrix which is solved with the available linear solver. With
TAUCS I used the functions set_coef and get_coef . I don't find the
equivalent of the get_function in the class Eigen matrix. How  can I have
a read access to the matrix coefficient in Eigen? Moreover, what is the
suggested method to free memory? (I'm just using the new and delete
operators to allocate and deallocate auxiliary matrices at main level).
Thanks in advance!