Comments on: Welcome!

By: Bindu

Bindu — Thu, 29 Oct 2009 04:51:20 +0000

sir please help me to get the sampling time of a signal using ode 45 algorithm

By: yiyi

yiyi — Fri, 21 Aug 2009 20:12:59 +0000

hi seth,
i saw previous comment that mention about fm demodulation
i need to model fm demodulation using simulink for my project but i have no idea how to proceed
i will appreciate if u could reply me
tq in advance :)

By: Matty Holmes

Matty Holmes — Tue, 28 Jul 2009 18:01:48 +0000

Hi Seth.
Im running Matlab r2008b on Windows Vista, and when I run a basic simulation such as the sin wave/integrator one in the help, I do not get a graph outputted. It simply seems to run for a small time-frame and nothing happens,
Thanks in advance

By: chris wilkins

chris wilkins — Fri, 15 May 2009 15:28:52 +0000

In Simulink, I can not easily pass a an array or vector into a transfer function block. At least I don’t think I can. I imagine that this basic utility must be addressed somehow. Am I missing something?

By: con

con — Tue, 17 Feb 2009 11:09:37 +0000

hi, i am generating parallel data which size will not be predetermined. eg. value = start,end,increment. these three values are coming from outside. so the size(value) is varied depends on starts,end and increment. now i want FIFO value.how cme i can convert parallel data(which is depend on input) to serial data by using simulink?

By: gustavo pinheiro

gustavo pinheiro — Sat, 14 Feb 2009 17:39:00 +0000

i want use serial block in simulink of matlab it dosent work and this error is detected how can solve this problem.
please help me
error is:
Error evaluating registered method ‘Start’ of M-S-Function ’sserialsb’ in ‘ode/Subsystem/Serial Send’. Error using ==> sserialsb>Start at 100
The block ‘Serial Send’ cannot be assigned a continuous sample time.
Please help me

By: Leonardo

Leonardo — Mon, 10 Nov 2008 22:53:06 +0000

I don`t really get how to use the variable q in the ARX or ARMAX models, when I correlate data in the toolbox Identification System.

By: Leonardo

Leonardo — Mon, 10 Nov 2008 22:51:42 +0000

Hello I was working with simulink trying to show some data from a process, I wanted to use a gauge block but It doesn´t appear on my simulink model, just appear a block with the word “ActiveX” on it. How I can do to see it correctly?

By: Danny

Danny — Mon, 13 Oct 2008 21:31:53 +0000

I have a large Simulink model (about 100 inports). I am developing a Matlab script that will allow me and my coworkers to run this simulation. The problem I’m trying to overcome is in importing variables from Matlab into the Simulink model.

To keep it straight, I use the same variable names in Matlab as are used in the Simulink model. However, when the variables are transferred to Simulink, the variable names don’t matter - it’s the order in which they’re listed.

I can take the time to make sure every input is in the right order, but that won’t solve my problem. There are about a half dozen people (around the world) who can add, remove, or renumber the inports. If they change something I’m unaware of, my script will send variable values to the wrong locations in the Simulink model.

Do you have a work around that will match the variables between Matlab and Simulink by name instead of order?

By: Prasad

Prasad — Tue, 07 Oct 2008 14:55:33 +0000

Hi
I am trying to generate bode plot of system through simulink.

I am sweeping a transfer function with a sinusoidal signal of amplitude 1 and frequency within some band. Say 1 rad/s to 1000 rad/s. I set the frequency as variable and run simulation for 10 cycles for each frequency. Then, I compare the input and output peaks for last cycle. The peaks ratio gives me gain and the timing difference between peaks gives me phase lag of the system. Taking log10 of gain gives me magnitude plot.

I compared this bode plot with the one generated by matlab command. They donot match beyond very small frequency range. Please comment on correctness of this method and also on, whether such technique can be used for simulink based systems.

I dont know, whether such topic was already discussed earlier, if yes plz give me the link.

Thanks
Prasad