By running my simulation in matlab simulink, it takes a long time an remains in the state of processing and doesn't conclude. simulink shows a massage that it suggests to run the below command:
by entering this command, the above problem remains and just in the length of the time that has been shown beside of processig status, the results in the Scope block can be seen that is a very short time. How can fix this problem?
The massage is:
and I can see results when duration of simulation running is T=0.222.
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
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.
I have a DAQ for Temperature measurment. I take a continuous sample rate and after DAQ, calculating temperature difference per minute (Cooling Rate: CR) during this process. This CR and temperature values are inserted into the Matlab script for a physical model running (predicting the temperature drop for next 30 sec). Then, I record and compare the predicted and experimental values in LabVIEW.
What i am trying to do is the matlab model is executing every 30 sec, and send out its predictions as an output from matlab script. One of this outputs helps me to change the Air Blower Motor Speed until next matlab run( eventually affect the temperature drop for next 30 sec as well, which becomes a closed loop). After 30 sec while main process is still running, sending CR and temperature values to matlab model again, and so on.
I have a case structure for this Matlab script. And inside of case structure i applied an elapsed time function to control the timing for the matlab script, but this is not working.
Yes. Short answer: I believe (one of) the reasons the program behaves weird on changed timing are several race conditions present in the code.
The part of the diagram presented shows several big problems with the code:
Local variables lead to race conditions. Use dataflow. E.g. you are writing to Tinitial local variable, and reading from Tinitial local varaible in the chunk of code with no data dependencies. It is not known whether reading or writing will happen first. It may not manifest itself badly with small delays, while big delays may be an issue. Solution: rewrite you program using the following example:
From Bad:
To Good:
(nevermind broken wires)
Matlab script node executes in the main UI execution system. If it is executing for a long time, it may freeze indicators/controls as well as execution of other pieces of code. Change execution system of other VIs in your program (say to "other 1") and see if the situation improves.
I run a pretty computationally expensive genetic algorithm with MATLAB. The code has been running for 3 whole days, and I am pretty sure it gets stuck somewhere, because it is not printing out the progress information for debugging purpose.
I now wish to stop it. I did CTRL+C, but no luck. The bottom left of the window still displays "Busy".
I cannot simply quit the whole MATLAB, because I need to find out where it gets stuck by inspecting the variables in the variable window.
Given the CTRL+C is not working, how can I
stop the execution, OR
save the variables for inspection purpose?
Sometimes ctrl-C stops working if you have a memory over-allocation problem -- if you are trying to allocate a matrix that doesn't fit in memory, and so virtual memory begins thrashing.
It's also likely that crtl-C won't work while execution is passed to COMSOL.
I think you have little choice now but to kill matlab and try to debug by either stepping through the code or inserting fprintf statements.
I am trying to run a real-time simulation in Simulink using Real-time Workshop. The target is grt(I have tried rtwin, but my simulation refuses to compile for it). I need the simulation to run in real-time so that one second in simulation lasts one second of real time. Grt ignores realtime and finishes the simulation in shortest time possible. Is there any way to synchronise it?
I have tried http://www.mathworks.com/matlabcentral/fileexchange/3175 but could not get it to work(does not compile).
Thank you for any suggestions.
Looks like it is impossible. I was able to slow down the execution by using Sleep(time in ms) function from WinApi and clock function from time.h, which looked quite good for low sample rates. However, when I increased the sample rate the Sleep function was sleeping for too long, which resulted in errors, with one second in simulation lasting more than one real world second.
The idea was to say that one period of iteration should last, let's say 200ms. Then time how long it takes for one iteration of code to execute using the clock function. Then call Sleep(200 - u), where u is the length of the iteration. The problem is that Sleep function sleeps the process and wakes it up when it wants to, not when you tell it to in the argument.
I know this is not a solution, but post this so that if anyone faces the same problem as me they won't try this dead-end solution. I had to rewrite the simulation for rtwin and now it works fine.
Another idea would be to somehow use interrupts, but I guess it would be quite complicated and not worth the trouble.