Receiving "Too many return arguments are specified. Specify only one."

David Sheets

2019 10 20

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I am trying to run a very simple code that gives me whatever values. I am new to MATLAB and I am just practicing. I have the following simulink diagram

and my .m is the following

options = simset; 
options = simset('MaxStep',1,'MinStep',1e-5,'AbsTol',1e-3);
 
tf = 10;
[t,xv] = sim('vdpol',tf,options); 

Once I can get t and xv I can perform plots but I seem to not get past that 7th line

Error using vdpolmat (line 7)
Too many return arguments are specified. Specify only one.

Like I said I am learning here and I know I am missing something dumb.

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David Sheets 2019-10-20

编辑：David Sheets 2019-10-20

So I solved why > [t,xv] = sim('vdpol',tf,options); was returning an error of too many return arguments.

I found that "Starting with R2009b, the sim command was enhanced to provide greater compatibility with parallel computing. The improved single-output format saves all simulation results to a single object, simplifying the management of output variables.

For backward compatibility with R2009a or earlier releases, use the backward-compatible syntax:

[T,X,Y] = sim('model',Timespan, Options, UT)

[T,X,Y1,...,Yn] = sim('model',Timespan, Options, UT)

If you specify only the model argument, Simulink automatically saves the time, state, and output to the specified output arguments.

If you do not specify any output arguments, Simulink determines what data to log based on the settings for the Configuration Parameters > Data Import/Export pane. Simulink stores the simulation output either in the current workspace or in the variable ans, based on the setting for Save simulation output as a single object parameter"

This means I needed to go into Model Settings > Data Import/Export pane and UNCHECK Single simulation output since I had the arguments [t, vx] on MATLAB R2019b.

More information can be found on:

https://www.mathworks.com/help/simulink/slref/sim.html

Hope this may help someone else.