How To save the value of time when a condition is met

Hi,

I am trying to save a value of time when a condition is met. the way I am currently implementing it is saving the array of time rather then the one value I require. My t is generated from a clock block in simulink.

% tM 1st instance of time when alpha1*alpha2 = 1
if (p.alpha1 * p.alpha2 == 1)&& (p.flag2 == 1)
    p.tM =t;
    p.flag2 = 0;
end

[Rik]

I have hardly any experience at all with Simulink, so I could be quite a way off, but if t is an array, shouldn't you store only the final value in the array?

The spam answers below will probably reduce the visibility of your question, so you may have to be a little more patient than usual.

[Kim Phillips]

Hi Rik,

Thanks for your reply, I am not sure if that will do it. The problem is as t (time) changes, so does p.tM when all I need is that one value for p.tM at that instance in time.

Regards

Kim

[Ashu]

Hi Kim,

Did you try linking the clock block in simulink itself.

[Kim Phillips]

Hi Ashu,

Thanks for your assistance.The clock block is linked via a mux into the matlab function block. when a condition is met p.ts should become that time, if the condition was met at 3 seconds into the simulation then p.ts = 3 however it is currently just equals all of time not that one instance when the condition was met.

I am going to attempt to add a trigger block to see if that will pull out the instance of time. If you know of any other way to grab that instance in the simulation that would be very helpful.

Regards,

Kim

[Mark McBroom]

You should not use a mux block. You should feed the digital clock block directly to the MATLAB Function block. Then, p.tM will be set to the current simulation time when the condition is true.

[Kim Phillips]

Thanks Mark.

p.tM does get set to the simulation time, however it changes as time changes, where as I need it to stay at one value and not change with time. I have extracted all my inputs from the mux block in my function so time is read as it should be inside the function.