I am trying to link an external app to a Simulink model and run the simulation step-by-step. In the model command description it says 'other MATLAB program-based tools to run a simulation step-by-step', what it does not say is how you do this.
The process looks to be:
compile model
then for each time step:
call outputs = model(t,x,u,'outputs');
call dstates = model(t,x,u,'update');
call derivs = model(t,x,u,'derivs');
What appears to be missing is the call to calculate the continuous states; does any one know how to do this?
There is no simple call for calculating continuous states.
You must write a code to calculate them.
More about that on this link:
http://www.mathworks.com/matlabcentral/answers/7267-what-is-the-best-way-to-execute-a-simulink-model-step-by-step-interactively-from-matlab
There is also a set of files with example.
Related
I wrote a script file in MATLAB that executes two functions as shown below:
function TempFunction()
fcn1();
fcn2();
end
After fcn1() is executed, I want the program to wait for execution of a model in Simulink, and then execute fcn2().
How can I do that?
One way to do this would be to use a Model Callback - set up a 'StopFcn' to trigger the next thing you want to run.
Alternatively, you could go into a loop polling the 'SimulationStatus' - see this page in the doc. .
you can call simulink models as functions from MATLAB as sim('Model_Name')
Read more about the options in the docs: https://uk.mathworks.com/help/simulink/ug/using-the-sim-command.html
and the sim function: https://uk.mathworks.com/help/simulink/slref/sim.html
I want a solution for command line implementation for Matlab Simulink. In simulink model there is simulation switch called "step forward". With this I am able to run step by step and able to see the outputs in scope for each sample time.
I am also able to change some inputs for constant input blocks at any sample period time. However, I want to do this in command line, because I have a huge model and I want to reuse this model verification script.
I am able to do some thing like this using "sim" command. But the sim command is just simulating the entire model at once, and I could not observe/change the intermediate outputs/inputs. The "sim" command with a certain stop time is running for certain sample periods, but later if I give the next "sim" command, it is running from the beginning and not starting from where it stopped. But, is there any exact Matlab command to step and pause (for one sample period time) the simulation, like that in simulink gui.
You want to use SimState to save the states of the model at the end of one simulation, and restore them at the beginning of the next simulation. How to do this is described in the documentation under Save and Restore Simulation State as SimState.
You cannot make any structural changes to the model (e.g. add or remove block) between each call to sim. There are also a few blocks which don't support SimState, see the documentation for more details. Note that this is for the latest release (R2015a), more and more blocks were added to support SimState over the past few years, so you want to check the release notes depending on the release you are using.
You can try this:
sldebug('gcs');
you are now in debug mode, you can type in help to get an overview of the available commands. To run through the model type in:
next
Each time you type next, you move the simulation one step forwards.
The following link will provide you with further details on how stepping through a simulation works.
http://www.mathworks.com/help/simulink/ug/how-stepping-through-a-simulation-works.html
For more details on using the debugger to run through the simulation step by step you can go to:
http://www.mathworks.com/help/simulink/ug/running-a-simulation-step-by-step.html
We are developing an ABM under AnyLogic 7 and are at the point where we want to make multiple simulations from a single experiment. Different parameters are to be set for each simulation run so as to generate results for a small suite of standard scenarios.
We have an experiment that auto-starts without the need to press the "Run". Subsequent pressing of the Run does increment the experiment counter and reruns the model.
What we'd like is a way to have the auto-run, or single press of Run, launch a loop of simulations. Within that loop would be the programmatic adjustment of the variables linked to passed parameters.
EDIT- One wrinkle is that some parameters are strings. The Optimization or Parameter Variation experiments don't lend themselves to enumerating a set of strings to be be used across a set of simulation runs. You can set a string per parameter for all the simulation runs within one experiment.
We've used the help sample for "Running a Model from Outside Without Presentation Window", to add the auto-run capability to the initial experiment setup block of code. A method to wait for Run 0 to complete, then dispatch Run 1, 2, etc, is needed.
Pointers to tutorial models with such features, or to a snip of code for the experiment's java blocks are much appreciated.
maybe I don't understand your need but this certainly sounds like you'd want to use a "Parameter Variation" experiment. You can specify which parameters should be varied in which steps and running the experiment automatically starts as many simulation runs as needed, all without animation.
hope that helps
As you, I was confronted to this problem. My aim was to use parameter variation with a model and variation were on non numeric data, and I knew the number of runs to start.
Then i succeed in this task with the help of Custom Variation.
Firstly I build an experiment typed as 'multiple run', create my GUI (user was able to select the string values used in each run.
Then, I create a new java class which inherit from the previous 'multiple run' experiment,
In this class (called MyMultipleRunClass) was present:
- overload of the getMaximumIterations method from default experiment to provide to default anylogic callback the correct number of iteration, and idnex was also used to retrieve my parameter value from array,
- implementation of the static method start,
public static void start() {
prepareBeforeExperimentStart_xjal( MyMultipleRunClass.class);
MyMultipleRunClass ex = new MyMultipleRunClass();
ex.setCommandLuneArguments_xjal(null);
ex.setup(null);
}
Then the experiment to run is the 'empty' customExperiment, which automatically start the other Multiple run experiment thru the presented subclass.
Maybe it exists shortest path, but from my point of view anylogic is correctly used (no trick with non exposed interface) and it works as expected.
I am looking to set up a test set for an existing Simulink model. Ideally I could take full control of the model, explicitly stepping it and measuring the state of any signal on any bus in the model.
As might have been gleaned, this is the precursor of a unit testing system for the model. Being so, I can't really justify changing the model to suit the test, the test must accommodate the model as-is.
The furthest I've got so far is using load_model() to return a handle to the model. From there there seems to be a quite obscure set of functions for accessing the model. I can't see any that relate to accessing states and can't see any further commands that relate to accessing a loaded model.
The easiest way is to use the Data Import/Export function within the Simulink Preferences.
Set the checkbox States and it will store every state of your system for every time step in your workspace, also when you pause the simulation or execute it step by step.
Be aware not to set Save simulation output as single object, in this case the access would be more complicated and you need to follow the instructions here.
To add to the other answer, you probably want to check this page in the documentation: Control Simulation Using the set_param Command. Of interest are the following commands:
set_param(<model_name>, 'SimulationCommand', 'start')
set_param(<model_name>, 'SimulationCommand', 'pause')
set_param(<model_name>, 'SimulationCommand', 'WriteDataLogs')
set_param(<model_name>, 'SimulationCommand', 'continue')
Replace <model_name> by the path to your model file.
I want to retrieve the data from simulink during simulation, and use serial network function to send these data to another program. Because I need to use another program to do some tricks and send command back to simulink, so I have to get data from simulink during runtime so that another program can make the right command.
I've tried using To Workspace block to export the data.
However, I can only got value in the very beginning of the simulation.
And I've also tried using scope and change some properties: check Save Data To Workspace and Uncheck Limite data to Last.
First, I started simulation, and I found the ScopeData didn't appear in the Workspace. Only when I stop simulation, ScopeData would appear in workspace.
And after that, I can use ScopeData.signals.values to get values.
But what I want is: when I start simulation, ScopeData would appear in workspace so that I can send these data to other program.
Does anyone know how to achieve this?
I found this page might be helpful, but I still don't know how to continuously export data during simulation.
Use get_param to read data from just at the current time. Also to send the data back to Simulink with set_param of a gain or another block.
An example of get_param
First load and start the simulation:
load_system('myModel')
set_param('myModel','SimulationCommand','Start');
To read data on any line of your simulink model:
Get a simulink block object (let's try a Clock with the name Clock):
block = 'myModel/Clock';
rto = get_param(block, 'RuntimeObject');
Then get the data on its first (or any) output port (or input) of that block.
time = rto.OutputPort(1).Data;
You could do the reading, in a timer callback.
Also this might be helpful: Command Line Functionality for Simulink
During simulation Simulink stores logged data in an internal buffer and only writes the data to the Workspace when the simulation is paused or stopped.
It sounds as if you really need to write an S-function (which will get signal values on a timestep-by-timestep basis) and communicate with Proteus that way.
Of course Simulink is a non-realtime simulator, so if you are talking about doing anything resembling real-time control then you are most likely taking the wrong approach altogether.
At any time during simulation you can force Simulink to write the simulation output data to the workspace:
set_param(bdroot,'SimulationCommand','WriteDataLogs');
I've found that this command is quite unstable in my Matlab 2010a for Win64. In particular I have to avoid it when simulation is stopped (i.e. first check
get_param(bdroot,'SimulationStatus') ), otherwise Matlab shows an error and asks to be restarted.