How to store value in simulink

Hello everyone I am desgning a model in which I need to store a value . For example: there is 2 inputs to the subsystem, input a & b .If a &b both are true, I calculate some values,say, x1 and x2. Now, next time when either a or b is false, I want to use those previously calcutaed values (i.e. when a & b were true). So, is there any way to store x1 and x2 in Simulink to use it later? Thanks in adcance.

[Aquatris]

You can use a "transport delay" block to store the value for the next time step (transport delay to delay the signal 1 time step so that the next time step you will have access to the signal from current time step) . Do you need to store the values for more than 1 time step?

[Gabriele Curcio]

I have the same problem, but I need to store values for more than 1 time step. How it's possible to do it?

Thanks in advance

Answer 1

[Ben Cunningham]

There is a good blog entry covering this.

I'd recommend the 'Enabled Subsystem' approach (coincidently the author's favourite as well).

[Ben Cunningham]

Alternately if you have the DSP System Toolbox the Sample and Hold block would be a neater but comparable solution.