Updates to balred() and gram()#118

Merged

slivingston merged 2 commits intopython-control:masterfrom

mdclemen:master

Jan 20, 2017

Commits on Jan 6, 2017

balred() now has 'matchdc' option and may handle unstable systems and will accept a list of 'orders'. gram() now does Cholesky factored gramians if desired. Requires slycot routines AB09MD, AB09ND,…
mdclemen
committed

Commits on Jan 19, 2017

Updated docstring for balred to remove abbreviations and better describe `alpha`. In balred(), if method='truncate' and the system is stable, slycot ab09ab is used, otherwise ab09md is used.
mdclemen
committed