Problems with sim command in Matlab 2020a

I am using a simulation model whcih has a To Workspace block named Results. In the Configuration Parameters dialog, the option 'Single Simulation Output' is not checked.

The thing is that when I click the Run button, I see that the Results variable is correctly generated in the workspace of Matlab. However, when I run the same simulation using the sim command from Matlab, the variable Resutls is not created but an object variable of type SimulationOutput named 'ans'.

May anyone help me with this. Thanks in advance.

[Buddy]

Just one comment.

I just realized that when using the following command:

sim (mdl_name); (mdl_name is a variable with the name of the simulink model)

The Results variable is created.

However, with the following command: sim (mdl_name, 'StopTime', '5');

The Results variable is not created but the 'ans' object I mentioned before

[stozaki]

Hi,

Do you set the return value of sim (mdl_name,'StopTime', '5') ;?

results = sim (mdl_name,'StopTime', '5') ;.

"ans" is the default return value if you have not set a return value.

ans

stozaki

Answer 1

[stozaki]

Hello

Is the result of the following command ”ans” ?

get_param (bdroot (gcs),'ReturnWorkspaceOutputsName')

If you turn on the value of the "Single simulation output" property, you will get the signals, states, outputs, etc. all in one output object. If you turn off the value of the "Single simulation output" property, you will get each output individually.

Since you are using the To Workspace block, you can get the value of Workspace by accessing the Data property from the ans object.

result = ans.simout.Data

You can also get the time data from the ans.tout property.

times = ans.simout.Time

Please also refer to what I have answered in the past.

Simulink Plot from Command Window

How can i erase the word "out." at the beginning of the variable name in block "to workspace"

stozaki

[Buddy]

Thanks for your answer.

The point is that in my model the "Single simulation output" text box (either checked or not) has the value "out" not "ans". The "ans" object that is generated by Simulink in Matlab does contain the variable "Results" but I do not know why this object is named "ans".

[stozaki]

Hi,

Do you set the return value of sim (mdl_name,'StopTime', '5') ;?

results = sim (mdl_name,'StopTime', '5') ;.

"ans" is the default return value if you have not set a return value.

ans

stozaki