creating a sawtooth signal via matlab function block

Hello everyone, I am trying to make a sawtooth signal in simulink via matlab function block, the code:

    function y  = fcn(t)
       y=t-floor(t/1)
    end

what i get is something similar to a sawtooth:

the signal does not drop immediately, it take's about 0.8 seconds to drop down to 0 which makes it more like a triangle signal. is there a way to make it more accurate? or maybe is there another way to make a sawtooth signal in simulink via matlab function?

Thanks in advance.

Answer 1

[Ameer Hamza]

It is because by default the simulation time step size is 0.2 seconds, therefore any update in a signal value will occur after 0.2 seconds hence after 4.8, the value change at 5. To decrease the step size Go to Simulation menu > Model configuration parameters > Solver > Solver Detail and write a small value of step size in place of auto.

[Kamal Ibn Bari]

Thank you sir

[Ameer Hamza]

You are welcome.