Prev: PMSG
Next: Enumeration
From: Colin on 12 Aug 2010 03:28
Is it possible to have a subsytem activated by multiple action ports?
The following algorithm is what I want to implement:
if x
do fnc
end
if y
do fnc
end
if z
do fnc
end
where x, y and z are complex functions, so I'd prefer to keep them as separate blocks. However, they all result in fnc being called. I could duplicate the fnc block, but this seems an odd thing to have to do.
Thanks for any ideas.
From: Will Campbell on 12 Aug 2010 08:42
Hi Colin,
I would use a Logical Operator block from the Logic and Bit Operations
library. Set it to 3 inputs and make the condition an OR. Supply x, y, and
z to the block, and feed the output to your Enabled Subsystem. This should
do the trick.

Alternatively, you can supply a Muxed signal to your action port. This is
equivalent to the OR construct, but it's a little less clear in my mind.

What's your ELSE condition when x, y, and z are false? You might need to
play with your Enabled Subsystem outport "Initial output" and "Output when
disabled" options.

Good luck,
-Will


From: Colin on 13 Aug 2010 04:43
"Will Campbell" <will.campbell(a)mathworks.com> wrote in message <i40q61$a46$1(a)fred.mathworks.com>...
> Hi Colin,
> I would use a Logical Operator block from the Logic and Bit Operations
> library. Set it to 3 inputs and make the condition an OR. Supply x, y, and
> z to the block, and feed the output to your Enabled Subsystem. This should
> do the trick.
>
> Alternatively, you can supply a Muxed signal to your action port. This is
> equivalent to the OR construct, but it's a little less clear in my mind.
>
> What's your ELSE condition when x, y, and z are false? You might need to
> play with your Enabled Subsystem outport "Initial output" and "Output when
> disabled" options.
>
> Good luck,
> -Will
>

Hi Will,
Thanks for the response. Unfortunately the algorithm isn't a simple OR, as if all conditions are true, I want to call the function 3 times, where as with an OR it will only get called once.
When x,y and z are false, then the function simply isn't called, and I move on to the next simulation step.

Any further ideas are appreciated.

Colin
From: Fangjun Jiang on 13 Aug 2010 08:45
"Colin " <colin.notthis.rogers(a)selexgalileo.northis.com> wrote in message <i430io$b6d$1(a)fred.mathworks.com>...
> "Will Campbell" <will.campbell(a)mathworks.com> wrote in message <i40q61$a46$1(a)fred.mathworks.com>...
> > Hi Colin,
> > I would use a Logical Operator block from the Logic and Bit Operations
> > library. Set it to 3 inputs and make the condition an OR. Supply x, y, and
> > z to the block, and feed the output to your Enabled Subsystem. This should
> > do the trick.
> >
> > Alternatively, you can supply a Muxed signal to your action port. This is
> > equivalent to the OR construct, but it's a little less clear in my mind.
> >
> > What's your ELSE condition when x, y, and z are false? You might need to
> > play with your Enabled Subsystem outport "Initial output" and "Output when
> > disabled" options.
> >
> > Good luck,
> > -Will
> >
>
> Hi Will,
> Thanks for the response. Unfortunately the algorithm isn't a simple OR, as if all conditions are true, I want to call the function 3 times, where as with an OR it will only get called once.
> When x,y and z are false, then the function simply isn't called, and I move on to the next simulation step.
>
> Any further ideas are appreciated.
>
> Colin

Try this,

Make each of your x, y and z subsystem generate a function-call, use a Mux block to mux them and then trig your function. I tried this. It worked.
 | 
Pages: 1
Prev: PMSG
Next: Enumeration