"mado " <email@example.com> wrote in message <firstname.lastname@example.org>... > "Trouble solving algebraic loop containing 'chee_pv/pv6/Algebraic Constraint/Initial Guess' at time 0. Stopping simulation. There may be a singularity in the solution. If the model is correct, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)" - - - - - - - - - It looks as though this error message is associated with the way you are using 'new' rather than being about 'new' itself. Are you using Simulink? If I were you, I would read that message very carefully and see if it contains a clue as what the trouble is. It seems to hint that some iteration you have set up, presumably involving 'new', is not converging properly.