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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:] 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:> To: Snehamoy Banerjee <mailto:> ; 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:] Sent: Tuesday, May 04, 2004 6:30 PM To: ; 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:> To: 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 _____________________________________ Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. _____________________________________ About this discussion group: To Join: To Post: To Leave: Archives: http://www.yahoogroups.com/group/matlab More DSP-Related Groups: http://www.dsprelated.com/groups.php3 <hr size=2 widthP0 style='width:375.0pt' alignter > . _____ makeover> _____ ermakeover |
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FW: build X(t)=Y(t)-X(t-1) using simulink!!
Started by ●May 7, 2004
Reply by ●May 18, 20042004-05-18
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Hi, Using S-functions in simulink u can solve ur problem, I tried ur problem like this, I took an input vector of any arbitary length, then in the s function i have written the logic for x(t) = y(t) +x(t-1); and the output is x(t); i am attaching the code and mdl file for your info. Hope this solves ur problem. Best Regards, -SaiRamesh. __________________________________ | |||
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