Error using sim command

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Michael Knörzer
Michael Knörzer 2019-1-31
评论： Fangjun Jiang 2019-1-31
Hello
I´m trying to simulate a simulink model/two different ones in a matlab script within a for loop using the sim command.
According to matlab documentation it should be possible to type either one of the following commands:
simOut = sim(model,ConfigSet)
simOut = sim(model)
My code looks like this:
mdl1 = 'TorquePressureModel1';
mdl2 = 'TorquePressureModel1';
cs = getActiveConfigSet(mdl1);
mdl_cs = cs.copy;
set_param(mdl_cs, ...
'SaveState','on','StateSaveName','xoutNew',...
'SaveOutput','on','OutputSaveName','youtNew')
for i = 1:2
if i == 1
simOut = sim(mdl1, mdl_cs);
elseif i == 2
simOut = sim(mdl2, mdl_cs);
end
...
I figured that this constructions works sometimes and sometimes it does not. And I get the same error using just
simOut = sim(mdl1);
The error is:
Error using sim
MEX level2 S-function "sim" must be called with at
least 4 right hand arguments
Error in AuswertungModellergebnisse (line 24)
simOut = sim(mdl1, mdl_cs);
If I use the command with 4 right hand arguments like
simOut = sim(mdl1, 'SaveState','on','StateSaveName','xoutNew',...
'SaveOutput','on','OutputSaveName','youtNew');
I get another error saying
Error using sim
The 4th right hand argument, FLAG, passed to MEX level2
S-function "sim" must be an integer
Error in AuswertungModellergebnisse (line 24)
simOut = sim(mdl1,
'SaveState','on','StateSaveName','xoutNew',...
Aren`t both of these ways of calling the sim command correct according to matlab documentation?
And why won`t they work?
I`m using matlab R2017a V9.2 and Simulink R2017a V8.9.
Thanks very much,
Michael

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采纳的回答

Fangjun Jiang
Fangjun Jiang 2019-1-31
sim() is a build-in command. It looks like you have a S-function called sim??
Run "which -all sim" to see if there is anything suspecious.
  2 个评论
Michael Knörzer
Michael Knörzer 2019-1-31
First of all, thank you for the response.
I think you`re right. I get
U:\ ...path ...\sim.mex64
built-in (C:\ ...path ....\sim) % Shadowed
Is there a way to indicated that I want to use the original sim command without renaming the sfunction?
Or is it possible to run the previously mentioned code using another command?
Fangjun Jiang
Fangjun Jiang 2019-1-31
To avoid conflicts, you have to rename your S-function and re-mex it. That is the only solution. For the meantime, you can remove the U:\..path ..\ from your MATLAB path and then you should be able to use the built-in sim() command.

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