I have written a matlab program for a simulink model and taking control through it programmatically, but I am facing one problem while using set_param('testmodel11', 'SimulationCommand', 'start');.
It gives all the values at once, that is gives the entire scope and workplace values all at the same time, but I don't want this. I would like to run the program and execute at that point, seeing only rest of the values should be zero. How can I stop the simulation at that point and fetch plots and values from that point only, the rest should be zero. And ideally have this same behavior for the next break points too?
There is a way to pause the simulation at certain breakpoints (simulation points), plot the output or do whatever is desired of it, and then continue the simulation until the next breakpoint.
However, at any breakpoint, you will get output data from all the time samples till the breakpoint is reached. To isolate data from a certain timestamp, you can calculate its index based on the sample time and extract it from the workspace (output data is stored as an array)
Here is the link to my answer which will be helpful, pls go through it:
https://stackoverflow.com/a/38348315/6580313
Now, in the m-file which you will run when the simulation is paused, you can change the value of the constant block which specifies the next simulation time at which simulation needs to be paused. In the m-file, you can also write a code snippet to access the output data.
Once the simulation continues, it will be paused at the new simulation time specified in the constant block.
Let me know in case you have any queries.
It sounds like you want to use the Simulink Debugger. Check out the documentation for more details on how to use it. The main command-line interface to it is sldebug.
Related
As a student I am currently working on a Matlab Simulink project. I am quite new to using Matlab/Simulink (few weeks).
I want to implement and run a Matlab “.m” file with which I can open Simulink and start the simulation. The aim is to do a 24h Test with a load cell cut into 1h “pieces” and to save the data to different sheets of an excel file each hour. So my simulation runs for 1h, stops and starts again, and so on. Through Matlab and a “for” loop I do the measures 24 times.
Between measuring steps I have to wait for simulink to finish its measures and saving the file in order for the Simulink window to be able to get closed by close_system('Thesis_SerDatTransm_Simulink').
So I tried to implement the delay with a while loop and by checking if the measures I get fit into an array of the size bigger than 449 (I measure 449 values):
for k=0:1:24
% Load Simulink
load_system('Thesis_SerDatTransm_Simulink.slx')
% Open Simulink
open_system('Thesis_SerDatTransm_Simulink.slx')
% Start Simulation
set_param('Thesis_SerDatTransm_Simulink', 'SimulationCommand', 'Start');
% Save Data
my_cell = sprintf('A%d',k);
xlswrite('file.xlsx',y,my_cell)
% Wait for Simulation
while 1
test=size(y)>=449;
if (test)
close_system('Thesis_SerDatTransm_Simulink')
break
end
end
end
The Problem now is, that program gets stuck at the while loop. Simulink is started, but no simulation or data gathering is done.
So I wondered if anyone could check if something is wrong with my While loop, since the rest of the programm works all fine without the loop (but receiving an error message, that during the simulation, Simulink window can't be closed).
I know there is a way to create a delay with waitforin matlab and create another function which I could call, but I couldn't figure out how to do this yet.
thanks
Regards
hohmchri
The right way to do this is to use the sim function to run your model (not the sequence of load_system, open_system and set_param that you have).
sim will block the execution of m-code until the model completes executing. Data can either be returned into the workspace (when used with no output arguments) or returned as an output from the call to sim. (And then you can write it to Excel as you've done.)
The only reason not to use sim, and perhaps use the commands you have, is if the model takes a long time to initialize, and you don't want to to open and close it every time through the loop. However, even in this case your code isn't correct. The load_system would be outside the loop; the open_system is not required; in your while loop you would poll the model's SimulationStatus property to see if it is still running (not the size of the y variable); and the close_system would be after the loop (as indicated by #m_power in one of the comments).
As written you should use the matlab pause command. This stops your execution for X seconds.
You should also look to optimize your code as m_power states
how to import a bitsream form binary vector from workspace into simulink.Actually I have found that I can use simin block or In block but my binary vector is independant of time. I tried to use Const block and it works but afer that when I wanted to put my output in the Buffer block in simulink, it didn't work because the input is continuous and not discrete. So I am asking if it's a way to add time to my binary uni-dimensional without having any influence on the result?and how can I do it?
Or is there another way to import this date to avoid this problem with Buffer block?
Your screenshot shows your constant block to have a sample time of Inf. As the error message suggest, you need to change that to a discrete sample time. In addition, you should also:
check your model is using a fixed-step solver
check what time step you are using for your chosen fixed-step solver (ideally the same as your constant).
You can have multi-rate models, but you need to manage the rate transitions with Rate Transition blocks. For more details on sample times, see the documentation, in particular how to view sample time information in a Simulink model. You should probably also have a quick look at the Choose a Solver section.
I am trying to make a simulation in Simulink, with the fuzzy model.
As inputs, I have set four time series variables from the workspace (compatible to simulink after performing Simulink.Timeseries function): every row of the variables has a linked time starting from 0 to 10566 (seconds, I believe). How can I set the sample time in simulink source block in order to pick every exact case without interpolation?
Thank you for your kind answers,
Phalaen
Are you using the From Workspace block? If so, it's simply a matter of specifying the sample time in the block parameters and unticking "Interpolate data". You can also display the sample time information of the model to check which sample time each block is using, see View Sample Time Information in the documentation.
I'm using the simulink block From Workspace to read in some audio data provided by a script. I have formatted the data in a matrix with 2 columns, the first is the timestamp and the second is the data.
In the configuration paramaters, I have specified Fixed-Step and Discrete solver. The Start time and Stop also need to be configured manually and don't seem to come from the data.
Also, in the From Workspace block configuration, I need to specify the sample time (1/44100) or I get a warning if I specify -1, to inherit from the data and then get strange sample times.
So, how can I get simulink to use only the sample times in the matrix and use the first and last timestamps as the start and stop time of the simulation?
You should be able to do what you want by doing the following:
Firstly note that your problem is by definition not fixed step, hence you cannot use a fixed-step solver, which by definition is ... fixed-step.
You must use a variable step solver.
Assuming your (2 column) input data is called simin then set the start and stop times to be simin(1,1) and simin(end,1) respectively.
In your From Workspace block set the sample time to be 0 (which should have been the default).
Also de-select the Interpolate data option; and set "Form the output after final data value by:" to zero (you won't be using anything past the end of your data set so this should be OK.
Then you need to tell the solver to take additional steps to those that it would naturally want to take.
Do this on the Data Import/Export pane of the Model Configuration Parameters.
Near the bottom of the pane there is a selection box and an edit box for doing this.
Note however that this does not prevent the solver from taking steps at other time points, it just forces it to take additional steps at the times you specify.
But because you have your From WOrkspace block to not interpolate this shouldn't be a problem either. You should put simin(:,1) in here so that the solver is guaranteed to take steps at the time points in your input data.
Note that if you want an input block that only samples at the time points in the simin time vector then the only way to do this is to write an S-function that uses the mdlGetTimeOfNextVarHit method to tell the solver what the next sample time (for this block) should be.
I am trying to control a simulink from a M-file.
What I want to do in the M-file is give the simulink model some input, run the simulink model, change one input value at 0.6 seconds, continue running the simulink model with the new input.
I already know that by using set_param, I can start, pause and continue the simulink, but the problem is I don't know how to pause the simulink model at a certain time(0.6s), is it possible to get the current time from simulink model and read it in the M-file?
Another way I already know is using sim to run simulink model from 0 to 0.6s, and use SimState to save the information at 0.6s, then load these information to resume the simulation. I am trying to change the input before the simulation resumed, but it seems that the model will load the input values from the information it saved, it won't take the new input value.
I stuck in this problem for a very long time, could someone help me with this please?
Thank you very much.
You can get the current time of a running simulation with:
get_param('simulink_model_name', 'SimulationTime');
So for instance by checking this value from your M-file during simulation by using
timer(...)
you can detect when the simulation is at 0.6 seconds.
I used a combination of simulink and m-script to achieve a similar goal.
In your model, add one 'assert' block. Double click it, and uncheck 'Stop Simulation when assertion fails'. In the 'Simulation Callback when assertion fails' field, add three commands:
set_param(bdroot,'SimulationCommand','pause');
run('myscript.m'); %insert the script name
set_param(bdroot,'SimulationCommand','continue');
Now connect the inport of this block to a 'not equal to' relational operator. Connect the first inport of the relational operator to a clock (pls set the decimation for analog clock or the sample time [usually -1 for inherited] for the digital clock).
The second inport is connected to constant block with a value of 0.6
On simulating the model, the simulation will pause at 0.6 sec, execute the m-file to change the input parameter (considering that it's tunable) and then continue with the simulation.
The assertion block is called when its input signal becomes 0. At 0.6 sec, the output of the relational operator will be 0.
Let me know if it worked.
This is not currently possible from an M-file. If you want to dynamically change the input at a given time externally, it will require an S-Function. Even this solution is difficult and wrought with flakey-ness since the Mathworks does not want to support this functionality in that it defeats one of the features of another toolbox they sell. In time, I believe they will grant this privledge, but it does not exist today. Also, why not use a dynamic input block to change the input value, like a map, signal builder, etc. ?