Upgraded to 2010b - can no longer specify Fixed-Step ODE4 with continuous states

Have had the following solver specs for years - worked great:

1) Type: Fixed-step 2) Solver: OD4 (Runge-Kutta) 3) All of our models have continuous states

I am trying to use embedded encoder with target support package (Spent big bucks for all these painful toys) on 2010b using idelink_ert.tlc.

No choice at all is now available for a solver - just a series of endless catch-22s. Can't use fixed setup with OD4. Can't pick OD4 with variable-set. Can't use descrete because all our models are full of continuous signals.

This is mind numbing, What have you done with Simulink?

[Doug Eastman]

Can you provide the error message you are receiving when trying to use ODE4? Is it during simulation or during code generation?

Answer 1

[Sulaymon Eshkabilov]

In fact, in Solver selection tab, Solver Type: Fixed-Step is selected, then all of the solvers ode1 (Euler), ode2 (Heun), ode3 (Bogacki-Shampine), odeFixed-step4(Rungge-Kutta), etc., are all fixed step solvers. By default, Fixed-step size (Fundamental sample timee) is "auto" that can be altered with a user entry.