How to zero order hold with time-varying sampling time?

I want the sampling time to be random value that is changing during the simulation. For example from random value generator.

I have tried this from matlab exchange: https://www.mathworks.com/matlabcentral/fileexchange/31711-zero-order-hold-with-variable-time-step

But i got an error, saying

The "VariableStepDiscrete" solver cannot be used to simulate block diagram 'VariableTimeSFunModel' because it contains continuous states

[Abdoullah NDOYE]

Hello,

I think you have either to change the "block.SampleTimes" in the s-function and choose you own sample time or change your solver to variable step.

For me, I had a sample time of 0.2, so I put block.SampleTimes = [0.2 0];

Hope it helps !

Answer 1

[Benjamin Thompson]

Simulink blocks and sources cannot change sample times on a per sample or per update basis in the way you are describing. The solver requires predictable update time steps. However, if your simulation might be able to run at a much smaller update time than the step size you want in your input signal, you could use a Signal Builder block or a lookup table function block in Simulink to interpolate your signal onto Simulink's time base.