Comments on: Initializing Parameters

By: krishna

krishna — Fri, 16 Dec 2011 09:49:05 +0000

Hi seth,
I have created the variables in workspace and assigning those variables in block dialog(simulink,PID controller block)versus directly assigning the numerical values in the PID block dialog.

By: Seth

Seth — Wed, 14 Dec 2011 11:40:37 +0000

@krishna – there should be no difference in answers as long as the values are the same. I’m not sure by which method you are “passing the parameter values from script file to simulink blocks.” Do you mean you call a set_param command? Are you creating variables in the workspace (P=1, I=.01, D=0) and assigning those variables in the block dialog?

By: krishna

krishna — Wed, 14 Dec 2011 10:58:37 +0000

Hi,
There is a variation in simulation results by passing the parameter values from script file to simulink blocks (PID controller)against the direct values assignment for the PID controller.CAN ANYBODY TELL ME THE REASON?

By: Seth Popinchalk

Seth Popinchalk — Thu, 20 Jan 2011 13:51:23 +0000

@siva - Your question might be better posted on the new Q&A site at MATLAB Central. Go to MATLAB Central and click on Answers. Be sure to tag your question with "Simulink". Good luck!

By: Guy Rouleau

Guy Rouleau — Thu, 20 Jan 2011 13:37:53 +0000

Hi Siva,

Maybe these links will help:

http://www.mathworks.com/support/solutions/en/data/1-1BWDA/index.html

http://www.mathworks.com/support/solutions/en/data/1-ASPEIV/index.html

By: siva

siva — Thu, 20 Jan 2011 06:16:52 +0000

I have a problem in passing the parameters values from a function to simulink. CAN ANYBODY HELP ME?

SIVA

By: Anna F

Anna F — Tue, 23 Nov 2010 21:10:39 +0000

Hi Seth,

Are there any extra settings in the model that have to be configured in order for this initialization to work? I appear to have done everything you said, however I keep getting an error in my model that tells me the workspace variable I’m trying to load does not exist (and checking the workspace, it never loads). I’m accessing a variable “x” which I define in a script(I’ll call the file “xi.m”), and my preload function calls this script (and yes, I remembered to just put xi in the preload). I am attempting to access the variable x through a constant block, and when I already have the variable in the workspace, it works just fine, its just the preload that isn’t working for me. Do you have any suggestions for something I could tweak to make it work?

Thanks!
–Anna

By: Sudha B

Sudha B — Wed, 19 May 2010 04:17:40 +0000

Seth,
I`m working on the inbuilt Matlab simulink model of 802.11a for my project work.The sampling rate for this model is 20 MHz and is fixed.Can you please help me,how to change the sampling rate for this inbuilt model?

By: Joel

Joel — Sun, 11 Apr 2010 05:15:45 +0000

I am writing a my own filter in simulink. And at present I am using the memory blocks provided by simulink. However I wish to convert to writing my own piece of code which will act like a memory block. It will be an array that acts like a FIFO buffer.

However to do this the array needs to be initialised in Simulink somehow so that it can be written to.
I only want to do this as a once off. But what ever i try so far hasn’t worked.

Any Ideas. Thanks
Joel

By: Ghodrat Esmaeili

Ghodrat Esmaeili — Mon, 08 Mar 2010 22:19:37 +0000

Thanks for all the good stuff you guys are posting here.