skipZerosQS
Usage: [A,n] = skipZerosQS(A [,eps,opts]);
skip data blocks that have all-zero entries to within eps
(default eps=1E-14). The total number of skipped blocks
is returned as 2nd argument.
For scalar (i.e. rank-2 block-diagonal) operators zero-
blocks are kept, by default (e.g. relevant for Hamiltonians
where states with energy zero are relevant states.
This can be disable by using the option '--all'.
Wb,May14,10