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Hi,
One point I forgot to
mention in my previous mail. You can avoid this problem by using the IC block
which sets an initial condition. That is it gives an output for the looped block
at t=0 and this will avoid the guessing problem.
Cheers,
-Snehamoy
----- Original Message -----
From: Abdul Fattah Batran
To: m...@yahoogroups.com
Sent: Friday, May 07, 2004 9:24 PM
Subject: FW: [matlab] build X(t)=Y(t)-X(t-1) using simulink!!
Sorry friends,
My question is as follows:
If I want to build the following equation what shall I do?
X(ti)=Y(ti)-X(t(i-1))
X depends on it's previous value in the
previous iteration.
Designing it with simulink gives a warring
because it's an algebraic
loop, where the algebraic loop occurs when
an input port with direct
feed through is driven by the output of the same
block, either directly,
or by a feedback path through other blocks with
direct feedthrough.
Simulink when dealing with algebraic loop, guesses the
previous value
using numerical method, which gives inaccurate result in my
model.
How to avoid this algebraic loop?
Could you please guide me to
design the same equation without guessing
the previous value by simulink, I
need the present value to be depend on
the previous iteration (at time t-h,
where h is the time stip)
Thanks a lot.
Yours truly,
abatran _____
From: Snehamoy Banerjee
[mailto:s...@yahoo.com]
Sent: Thursday, May 06, 2004 6:14 PM
To:
Abdul Fattah Batran
Subject: Re: [matlab] build X(t)=Y(t)-X(t-1) using
simulink!!
Hi,
Could you be more explicit about
your equation. Please explain the
terms and the equation.
-Snehamoy
----- Original Message -----
From: Abdul Fattah Batran
<mailto:a...@birzeit.edu>
To: Snehamoy Banerjee <mailto:s...@yahoo.com> ;
m...@yahoogroups.com
Sent:
Thursday, May 06, 2004 2:37 PM
Subject: RE: [matlab] build X(t)=Y(t)-X(t-1) using simulink!!
Hi,
How to build this:
X(ti)=Y(ti)-X(t(i-1))
I think using delay block here is not good.
thanks
_____ From: Snehamoy Banerjee
[mailto:s...@yahoo.com]
Sent: Tuesday, May
04, 2004 6:30 PM
To: m...@yahoogroups.com;
Abdul Fattah Batran
Subject: Re: [matlab]
build X(t)=Y(t)-X(t-1) using simulink!!
Hi
Abdul,
If yours is a Continuous
System then use the Transport Delay
Block for the X(t-1) part and if it is
Discrete then use the Unit Delay
block. Assuming Y(t) to be the output,
just feed the input X(t) to a Sum
block. Also feed the same input in
parallel to the Delay block and feed
its output to the second input of the
summer. Your equation is ready.
You may give any type of continuous source
as input X(t) and see the
output Y(t) on a Scope.
If X(t) is the output, Delay block will be in the feedback
path.See the clipping below for continuous system..
Hope this solves your problem.
-Snehamoy
----- Original
Message -----
From: Abdul Fattah Batran
<mailto:a...@birzeit.edu>
To: m...@yahoogroups.com
Sent: Tuesday,
May 04, 2004 5:58 PM
Subject: [matlab] build X(t)=Y(t)-X(t-1) using
simulink!!
Hi all,
How to build this equation using simulink?
X(t)=Y(t)-X(t-1)
Thanks a lot.
Yours,
Abatran
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