function B = continuity(momobj)% continuity.m A nonlinear algebraic equation model object constructor, derived%              from the naemodel class. Called as%%               A = continuity(momobj)%% INPUT PARAMETERS%%       momobj : A momentum (balance) object%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% set up an instance of the continuity object% Solution initial guess is obtained from object momobjunpack(momobj)var   = assocarray({'d' d});param = assocarray({'momobj' momobj});A = naemodel('continuity',var,param);B = struct([]);B = class(B,'continuity',A);