Error using sim command

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

Answer 1

[Fangjun Jiang]

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.

[Michael Knörzer]

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]

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.