Run simulink model in for loop

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SREEJITH V S
SREEJITH V S 2020-9-17
编辑： SREEJITH V S 2020-9-18
Hi,
I would like to run a simulink model and save results as .mat files in a for loop. I do this with for loop and working fine. Now, I would like to use parfor function. But I could not figure it out how it can be done. I am describing a simple model to explain my problem.
Matlab verson is : R2020a 64 bit in Windows pc, I have license for parallel computing tool box also.
-Simulink model consist of a variable voltage source connected across a resistor.
-Resistance of the resistor (R) changes in each for loop.
-Variable voltage source block creates sinusoidal voltage. The frequency of the voltage changes in each loop.
-Resistance and input to variable voltage source are defined in matlab work space. Simulink reads these parameters during simulation. In every occurance of the for loop these parameters vary.
-During simulation a scope records voltage across the resistor. After simulation it logs data to workspace as an array named 'volt'.
-This array volt is saved in the current directory as a .mat file with different file names.
With for loop the simulation goes perfectly fine. Code for for loop is given below.
clc
clear all
close all
for k=1:1:10;
f=k; %frequency of sine wave
R=50*k; %value of resistor
dt=1e-4; %time step
t=0:dt:10; %time vector
voltage=4e-4*sin(2*pi*f*t); %sinusoidal voltage
wave = struct(); %input to simulink wave block
wave.time = t';
wave.signals.values = [voltage'];
wave.signals.dimensions =1;
sim('Test.slx');
foldern=(['f',int2str(k)]);
save(foldern,'volt'); %Output from simscape scope 'volt' is saved as mat file with different names
Simulink.sdi.clear;
end
For using parfor, I tried different ways mentioned in the website. But I could not simulate. One of the try is given below. How can I modify my above code with for loop for using parfor?
clc
clear all
close all
% model = 'Test.slx';
myDictionaryObj = Simulink.data.dictionary.create('testdd2.sldd');
dd = 'testdd2.sldd';
spmd
Simulink.data.dictionary.setupWorkerCache
end
parfor k=1:1:10;
dictObj = Simulink.data.dictionary.open(dd);
sectObj = getSection(dictObj,'Design Data');
entryObj = getEntry(sectObj,'MODE');
temp = getValue(entryObj);
temp.Value = CtrlValues(index);
setValue(entryObj,temp);
%
f=k; %frequency of sine wave
R=50*k; %value of resistor
dt=1e-4; %time step
t=0:dt:10; %time vector
voltage=4e-4*sin(2*pi*f*t); %sinusoidal voltage
wave = struct(); %input to simulink wave block
wave.time = t';
wave.signals.values = [voltage'];
wave.signals.dimensions =1;
[volt]=runsimulation;
foldern=(['f',int2str(k)]);
save(foldern,'volt'); %Output from simscape scope 'volt' is saved as mat file with different names
discardChanges(dictObj);
close(dictObj);
end
spmd
bdclose(model)
Simulink.data.dictionary.cleanupWorkerCache
end
Please help me with this.
I am attaching .m file and .slx file of simulink model.
  2 个评论
Raymond Norris
Raymond Norris 2020-9-17
编辑：Raymond Norris 2020-9-17
Hi Sreejith,
Could you provide more info about how the model could not simulate? Are you getting errors, warnings, incorrect results, etc.?
I'm not a Simulink user and can't provide an answer, but if you haven't already, you might consider looking at parsim
https://www.mathworks.com/help/simulink/slref/parsim.html
Raymond
SREEJITH V S
SREEJITH V S 2020-9-18
Hi Raymond,
Thank you for your suggestion. I have used parsim function and I could do the simulation by defining each variables using setVariable.
Now I have two more doubts remaining.
-I would like to bring a time series structure defined as 'wave' below in matlab workspace to simulink environment as I brought other variables using setVariables function. How can we do it?
-If I defined a constant 'A=10' in matlab workspace, is there any method other than setVariable to incorporate it in simulink variable list. I wanted to call A inside some simulink blocks. I am looking for some function which make all constants in the matlab workspace available to simulink during parsim simulation.
Thanks again.
Sreejith
model = 'Test';
load_system(model);
f=1:2:20;
numSims=length(f);
R=50*f; %value of resistor
dt=1e-4; %time step
t=0:dt:10; %time vector
for k=1:length(f)
ff=f(k);
voltage=4e-4*sin(2*pi*ff*t); %sinusoidal voltage
wave = struct(); %input to simulink wave block
wave.time = t';
wave.signals.values = [voltage'];
wave.signals.dimensions =1;
st(k)=wave;
end
clear wave
simIn(1:10) = Simulink.SimulationInput(model);
for idx = 1:10
simIn(idx) = setVariable(simIn(idx),'R',R(idx));
simIn(idx) = setVariable(simIn(idx),'x_v',1e4);
simIn(idx) = setVariable(simIn(idx),'ff',f(idx));
simIn(idx) = setVariable(simIn(idx),'dt',1e-4);
end
simOut = parsim(simIn)

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回答（1 个）

Joel Van Sickel
Joel Van Sickel 2020-9-17
Hello Sreejith,
please use the parsim function for this type of application. If you want to use parfor, there are ways to do it, but they are more complicated.
https://www.mathworks.com/help/simulink/slref/parsim.html
If you want to use parfor, here is some example code. This code uses the controls toolbox to linearize a model: You will need to configure the pool and multiple directories for each one to run in.
https://www.mathworks.com/help/simulink/ug/not-recommended-using-sim-function-within-parfor.html
Regards,
Joel
  1 个评论
SREEJITH V S
SREEJITH V S 2020-9-18
编辑：SREEJITH V S 2020-9-18
Hi Joel,
Thank you for your suggestion. I have used parsim function and I could do the simulation by defining each variables using setVariable.
Now I have two more doubts remaining.
-I would like to bring a time series structure defined as 'wave' below in matlab workspace to simulink environment as I brought other variables using setVariables function. How can we do it?
-If I defined a constant 'A=10' in matlab workspace, is there any method other than setVariable to incorporate it in simulink variable list. I wanted to call A inside some simulink blocks. I am looking for some function which make all constants in the matlab workspace available to simulink during parsim simulation.
Thanks again.
Sreejith
model = 'Test';
load_system(model);
f=1:2:20;
numSims=length(f);
R=50*f; %value of resistor
dt=1e-4; %time step
t=0:dt:10; %time vector
for k=1:length(f)
ff=f(k);
voltage=4e-4*sin(2*pi*ff*t); %sinusoidal voltage
wave = struct(); %input to simulink wave block
wave.time = t';
wave.signals.values = [voltage'];
wave.signals.dimensions =1;
st(k)=wave;
end
clear wave
simIn(1:10) = Simulink.SimulationInput(model);
for idx = 1:10
simIn(idx) = setVariable(simIn(idx),'R',R(idx));
simIn(idx) = setVariable(simIn(idx),'x_v',1e4);
simIn(idx) = setVariable(simIn(idx),'ff',f(idx));
simIn(idx) = setVariable(simIn(idx),'dt',1e-4);
end
simOut = parsim(simIn)

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