MATLAB: What does “Minimize algebraic loop occurrences” actually do

algebraic loopatomic subsystemsimulink

I have been warned of an algebraic loop in a Simulink model. One of the suggested actions is:

"This algebraic loop may be resolved when the subsystem option 'Minimize algebraic loop occurrences' is selected on some or all of the atomic and enabled subsystems in this algebraic loop."

The help page for 'Minimize algebraic loop occurrences' (https://uk.mathworks.com/help/simulink/gui/minimize-algebraic-loop-occurrences.html) doesn't really explain what Simulink is doing when the box is ticked.

Can someone explain?

Best Answer

Hi Miles,

This parameter directs Simulink to try to eliminate the algebraic loop that contains an atomic subsystem, when it simulates the model. You can read more about this in the following link that also shows different examples.

https://se.mathworks.com/help/simulink/ug/remove-algebraic-loops.html

Best,

Jesús

Related Solutions

MATLAB: Do I get an Algebraic Loop error when I do not have any algebraic loops in Simulink 6.0 (R14)

This is due to the way Simulink detects Algebraic Loops involving atomic subsystems. Please turn on "Minimize algebraic loop occurrences" in the Subsystem properties dialog for atomic subsystems without direct feed through.

For more information regarding this, please refer to the following technical solution:

MathWorks - 1-17XUV: Why does converting my subsystem to a S-function with the Real-Time Workshop introduce an algebraic loop?

MATLAB: Do I receive a warning message when I enable the “Minimize algebraic loop occurences” setting of a model used as model reference into another model in Simulink 7.4(R2009b)

This change has been incorporated into the documentation in Release 2011a (R2011a). For previous releases, read below for any additional information:

The "Minimize Algebraic Loop occurrences" option is unchecked by default and it should be enabled only when algebraic loops are detected in the model, so that they can be minimized by Simulink.

This warning is displayed when the "Minimize Algebraic Loop occurrences" option is enabled and the Model Reference block contains direct feedthrough path. This error message is displayed to inform the user that if he uses the output of the Model Reference block to compute its input, an algebraic loop will occur and it will be impossible to minimize it.

This diagnostic can be set to 'none', 'warning' or 'error' in the diagnostic section of the model configuration pane.

In some cases, the referenced model does not contain any direct feedthrough path and the "Minimize Algebraic Loop occurrences" algorithm can fail. For an example of such situation, download the attached model "MainModel.mdl" and the model it refers to "RefModel.mdl"

For more details on algebraic loops and direct feedthrough blocks, you can click on the link below.

 <http://www.mathworks.com/access/helpdesk/help/toolbox/simulink/ug/f7-8243.html#f7-19688>

Best Answer

Related Solutions

MATLAB: Do I get an Algebraic Loop error when I do not have any algebraic loops in Simulink 6.0 (R14)

MATLAB: Do I receive a warning message when I enable the “Minimize algebraic loop occurences” setting of a model used as model reference into another model in Simulink 7.4(R2009b)

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