def use_solver(**kwargs):
 if ('useUmfpack' in kwargs):
  globals()['useUmfpack'] = kwargs['useUmfpack']

def use_solver ( ** kwargs ) : if ( 'useUmfpack' in kwargs ) : globals ( ) [ 'useUmfpack' ] = kwargs [ 'useUmfpack' ]
select default sparse direct solver to be used .