Real-time control with Matlab/Simulink
I am trying to control a robotic arm that performs a high speed task using a model in Simulink. The arm has it's own server that communicates with the control computer via UDP protocol.
The problem that I am experiencing is very low task repeatability. This seems to be due to execution time beeing non-linear where it should be linear. One of the reasons for this is that outside processes are interrupting matlab while the task is beeing executed. I tried closing as many as possible, but the problem still persists.
I also tried using real-time windows target, but it wouldn't ...Matlab keeps crashes time after time when using Simulink
every time I use SIMULINK (just programming) Matlab keeps crashing in
First Matlab states:
'MATLAB hat ein Problem festgestellt und muss beendet werden.' (~
Matlab encountered a problem and has to be stopped)
Afterwards Matlab crashes/quitts .
I appritiate any ideas.
i am having the same problem. were u able to resolve it ??
Michael Schiek wrote:
> every time I use SIMULINK (just programming) Matlab keeps crashing
> random intervals.
> First Matlab states:
> 'MATLAB hat ein Pro...MATLAB: How do you simulate a simulink model using a string?
Hey guys can you please help with this, I just cant get it.
I have a simulink model with the name BusAssignment and with that I have an edit box inside a GUI with a string BusAssignment. I am trying to get the mfile to read the String and simulate it as it is the name of the simulink model.
At the moment I have the follow piece of code for that section
SimulinkName = get(handles.simulinkname, 'String'); %takes the simulink model name
sim(SimulinkName) %runs the simulink model
SimulinkName gives back BusAssignment but when it goes to sim it trys to simulate SimulinkNa...Matlab simulation time
Could you help me with my simulation time of matlab? My question
is how to set the matlab when I test the performance of my
simulation. The situation is that I need to run my simulation more
than 50 times and I do not need to restart my simulation every time.
I just run once and I can get 50 results at the same system. Then I
can let my computer work by itself and I can do other job. Thank you
Use the sim command. U have to type the simulation time as parameter in
the command. I use Out blocks (usually for the subsystems) with the
variable as bloc...Timing in matlab simulation
for my simulation, i need to do timing - a function to run on constant time delays, no matter what (for example during the simulation, the program should do measurements on constant time interval, meanwhile it do some calculation on the measurments)
how do i do it?
You could use:
for i = 1:n
your simulation function....
with n a nonnegative real number (when the time
interval is not too small because for high resolution
there can be high relative error). If exactness is
important at small time scales you should check out
inf...Time-varying State-Space Model in MATLAB/Simulink
Please let me know how to implement a time-varying SS model in MATLAB/Simul=
ink (SL). I am using MATLAB R2011a. I am using State-Space block in Simulin=
k library to specify my A, B, C, D matrices. But here the problem is the el=
emnts of the matrices will change after certain time during the simulation =
or it may change continuously. Is there any way to implement this in MATLAB=
...Stateflow Model Simulation error in Matlab Simulink Environment.
I am trying to simulate a STATE-FLOW model of a Single Input and Single Output
system. The error which I am getting on Simulation is "Unable to locate a C-compiler
required by Stateflow and MATLAB Function blocks. Use 'mex -setup' to select a
supported C-compiler." Please suggest me the necessary action that can be taken for the
Thanks in advance.
Sumanta Kumar Show
National Institute Of Technology Karnataka Surathkal
"Sumanta " <firstname.lastname@example.org> wr...how to simulate a Simulink model step by step from Matlab command window?
I know we have to use model_name(t,x,u,flag) command but even an
extremely simple model gives the following error message
"One or more output arguments not assigned during call to
Does anybody have an example for step by step simulation of a
You may consider running simulink debugger.
Oguz Dagci wrote:
> I know we have to use model_name(t,x,u,flag) command but even an
> extremely simple model gives the following error message
> "One or more output arguments not assigned during call to
>...How can I use a Matlab function, whose inputs varies with time (real time function), in simulink
I need your help
I would llike to know how can I use a Matlab function, whose inputs varies with time (real time function), in simulink.
Thank you in advance
...Re: how to simulate a Simulink model step by step from Matlab command window?
could you help me.
> could you help me.
...MATLAB/Simulink and Source Control (MKS Client). MATLAB Performance Improvement.
I'm looking for two things. Help with either one would be
1) I have a MATLAB GUI that runs a series of scripts. It
makes use of the fixed point toolbox (fi objects and
quantizer objects) and those things make it VERY slow. I
have rewritten the quantizer and made my own quantizer m
function. But, it doesn't warn me about overflows or
underflows (which I suppose I could code up). Just the
same, it'd be nice to go from MATLAB scripts and function
to machine code if that's possible.
2) We use MKS Integrity Client 2006 for software source
control. ...vehicle simulation
hi there, i am currently developing a vehilce simulation model using matlab simulink. The simulation requires a vehilce to be simulated travelling around a simple race track. the vehilce model itslef has already been created and have all necessary vehicle input data for the simulation. the problem i have is that i have to simulate the vehicle approaching a corner from a straight line and decelerating at first 0.4g and then 0.8g, so that it travels around the corner at 10m/s. therefore i need to have a function that will determine the braking point relative to the stopping distance, (obviously ...a matlab simulink simulation problem
I meet a error warning which was "Input data dependency violation due to action subsystems. See Subsystem Examples in the Simulink library for valid and invalid examples of action subsystems".
I know a way out. "Just for info putting a unit delay at the input can hopefully solve your problem,"Someone said. There's no error in my control system afer adding a unit delay at the input of the controller, but another problem finds me. The system is unstable. For the unstable system, the object is built by S-Function. Otherwise, for the same con...MATLAB and SIMULINK real time
I have to change a variable in simulink real time model when this
model is running. I need to change it in matlab command line,
how I can do this? Anyone know some examples?
> hi all,
> I have to change a variable in simulink real time model when this
> model is running. I need to change it in matlab command line,
> how I can do this? Anyone know some examples?
have a look at "external mode".
Matlab can't intefere with a Simulink process, normally.
Check Simulink helps & docs,...PSK Simulation
I created the same PSK simulation in Matlab and in Simulink. Both
models simulate BPSK data being passed through an AWGN channel. Even
though these simulations are the same, I get different results. Is
there a difference between "AWGN" command and the "AWGN" block? Or
is there a difference between "pskmod" and the "BPSK" block? Thanks
...Simulation time in a MATLAB-Function
I want to get the "simulation time" in a (embedded) MATLAB-Function.
In a Simulink-Block the simulation time can get by the "Clock"-block,
which outputs the current simulation time at each simulation step.
I want to do the same in an (embedded) MATLAB-Function! Is there any
command or something else to get the simlation time (NOT the current
Thanks to all experts!
...Matlab to Simulink in real time
I'm trying to use Matlab workspace data as input for Simulink instead of a joystick or mouse. Admittedly, I'm pretty inexperienced with both programs, so I can't figure out how to do this. The "From Workspace" block only takes data from the Matlab workspace at the start of the Simulink model. How can I constantly send data from Matlab to Simulink throughout the simulation? Thanks ahead of time.
"James Yamada" <email@example.com> wrote in message <firstname.lastname@example.org>...
> I'm trying to use Matlab workspace data as input for Si...Use unevenly spaced measurement time series from MATLAB workspace as input for Simulink model
I'm currently trying to verify an Error State Space Kalman Filter algorithm with real measurement data. My Simulink model shall run at discrete 0.005 s time steps (200 Hz). I discretized and rounded the time vectors given by the devices to 0.005 s to fit the Simulink model. One of the data vectors, that is used to update the filter in a lower frequency about 8 Hz, has unevenly spaced timestamps ranging from 0.1 s, 0.125 s to 0.15 s, yet still in a 0.005s resolution. I want the Kalman Filter to perform the update with the measurement data at the exact time steps given in the time ...How to get simulink simulation time to be the same as actual time.
I am using trying to use simulink as a controller for an experiment using a data acquisition board to read in instrument signals and send out command signals real time. I am having a few issues and I believe that all of these could be resolved if I could just get the simulation time to be real time. What I mean is that if I use a fixed time step of .01 seconds and have a simulation time of 10 seconds then I want the simulation to last 10 seconds and have a delay of .01 seconds between each time step. Is there a way to do this or is there a tutorial I should read for how t...how can i use my time as simulation time in Simulink?
i type the following commands to set the simulationstime of matlab.
lw = [ttc', lwc'];
rw = [ttc', rwc'];
rg = [ttc', rgc'];
[ts,xs,ys] = sim('EBM_P2',tt(end),,lw,rw,rg,tt)
my time has the value 1x332 double ,but ts has the value 415x1
ts has the value 1x
despite of giving the time("ttc") matlab use his simulationtime.
how can set my time as simulationtime?
please answer me.
thanks for your helping.
...Sequencial calling to Simulink during a MATLAB simulation
I have a compex MATLAB simulation model of an aircraft.
The simulation uses MATLAB's ode45 solver to integrate the equations of motions in time.
I'm trying to implement a flight control system (FCS) in SIMULINK which will continuosly provide the required control commands to the simulation during each integration step (using the "sim" command).
The only way I could achieve this is:
1. Integrate the aircraft state equations during a short time interval (say dt).
2. Call the sim command using the current aircraft states (speed, angular rates, etc...) and the last step compl...Matlab Simulink Coupler Simulation Problem
I am trying to do some Matlab Cadence co simulation following the AVUM
Workshop included in Cadence Distribution.
My circuit is a very simple CMOS inverter. I am providing the Pulse
Input to the inverter from Matlab/Simulink though the coupler and
feeding back the output of the inverter to Matlab/Simulink by the
I am noticing that whwever the square pulse is going through the
coupler from Matlab to Cadence, it is getting converted into
Triangular Pulse. And hence my circuit is not functioning properly.
How can I make it work properly?
I am using the following:
Matlab Vers...Getting a Matlab plot during simulation in simulink
I want to plot the output from my simulink model during simulation
using a matlab plot, (because u cannot do editing on the simulink
scope or XY graph), How to obtain the Matlab plot during simulation
which gives the complete simulation result.
You could use the time series tools in R14sp3 (inspect signals check box in
data I/O configuration paramaters) which allows this, or you could pause the
model then look at the signals yourself if you are using to workspace
blocks, or you could make your own scope from an m-code s-function to do the
"Hector" &l...Time varying filter in Matlab (not simulink)
I see that simulink has a way to implement filters where the coefficients change on a per sample basis. Is there an equivalent thing in regular matlab? I could make it myself but it might be painfully slow if I had to implement nearly every multiply in an m-file.