accessing Matrix and ComplexMatrix objects

[Michael J Ursiak]

I am interfacing a lanczos fortran subroutine with octave and have a 
question about Matrix and ComplexMatrix objects.  The fortran subroutine
may will return a Matrix or ComplexMatrix of size m by n, but I it may
only have m by k (k < n) significant elements which I want to return from
the wrapper function to the octave environment.  How can I access the
m by n Matrix (or ComplexMatrix) and copy its elements to a m by k Matrix
(or ComplexMatrix) to return from the wrapper function to the octave 
environment.  Thanks.