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From: Gerry on 9 Mar 2010 12:33
Hello,

I am developing a model that activiates certain subsystems when a time condition has been met. What I am observing is that once the 2nd block of "if/then" subsystem becomes "true" it continues to operate even if the 1st block of the if/then subsystem condition is no longer met. I've selected the "reset" option within the if/then subsystem, but that didn't change the result. I suspect I am missing a subtle point in how to create this kind of functionality within a if/then subsystem. Love some pointers or links I can review. Essentially, I want the if/then statement to work only when the specific time condition is met.

Thanks for anyone's help,
Gerry
From: Gerry on 11 Mar 2010 10:47
> Hello,
>
> I am developing a model that activiates certain subsystems when a time condition has been met. What I am observing is that once the 2nd block of "if/then" subsystem becomes "true" it continues to operate even if the 1st block of the if/then subsystem condition is no longer met. I've selected the "reset" option within the if/then subsystem, but that didn't change the result. I suspect I am missing a subtle point in how to create this kind of functionality within a if/then subsystem. Love some pointers or links I can review. Essentially, I want the if/then statement to work only when the specific time condition is met.
>
> Thanks for anyone's help,
> Gerry

I posted this question in Seth's blog and Guy answered it at:
http://blogs.mathworks.com/seth/2009/08/20/a-better-if-else-construct/#comment-997 The key point is there are additional "held/reset" options even on the output of a subsystem
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