MATLAB: Does the Simulink function in a Stateflow chart give variable undefined errors for variables defined in the chart

functionsimulinkstateflowundefinedvariable

I have a Simulink function defined in a Stateflow chart and it is trying to use the input to the Stateflow chart (e.g. "x") as the value of a Constant block. When I use "x" in the Simulink function I get an error saying that "x" is not defined. How do I fix this?

Best Answer

Simulink functions defined in Stateflow charts do not have access to the Inputs and Outputs of the Stateflow chart containing them. You can not, for instance, have a Constant block with value "x" if "x" is only defined as an Input to the Stateflow chart. If you want to use values from your Stateflow chart inside the Simulink function you need to pass them to the function through Inports instead. Similarly if need to get output from the function to use in the Stateflow chart you need to use an Outport. Adding Inports and Outports will add additional arguments and outputs to the function that can be given when calling the function in Stateflow.

Related Solutions

MATLAB: Do I receive a “Error using Stateflow.Clipboard/copy” when I try to update Stateflow library interfaces that contain graphical Stateflow functions that are set to “subchart” in R2017a+

In MATLAB R2017a+, you can copy the content of the sub-charted graphical functions by setting the flag '-depth' to 1. This will copy a sub-charted function and its content all together. Please note that this solution works best if there is not a mix of sub-charted and non-sub-charted graphical functions and or states.

Please refer to the following lines of code below for an example of how to set this flag:

% Find the matching chart.  Get contents.
State = OldChart(iOldChart).find('-isa', 'Stateflow.State', '-depth', 1);
Transition = OldChart(iOldChart).find('-isa', 'Stateflow.Transition', '-depth', 1 );
Junction = OldChart(iOldChart).find('-isa', 'Stateflow.Junction', '-depth', 1);
Note = OldChart(iOldChart).find('-isa', 'Stateflow.Note', '-depth', 1);
Function = OldChart(iOldChart).find('-isa', 'Stateflow.Function', '-depth', 1);
Box = OldChart(iOldChart).find('-isa', 'Stateflow.Box', '-depth', 1);

Another alternative if there are some components that are not getting copied because they are in a different depth is to do the following:

% Find all objects
states = OldChart(iOldChart).find('-isa', 'Stateflow.State');
% Select the objects that are in the same subviewer
states = states(arrayfun(@(x)(x.Subviewer.Id == x.Chart.Id), states));

Then, you should be able to use the "sfclipboard" object to copy and paste the contents of the library.

MATLAB: Do I get the error ‘Implicit wakeup or tick events are invalid in charts with input events ‘tick” in Stateflow

The error is due to the fact that 'tick' is an implicit event provided by Stateflow:

https://uk.mathworks.com/help/stateflow/ug/using-temporal-logic-in-state-actions-and-transitions.html

https://www.mathworks.com/help/releases/R2018a/stateflow/examples/using-absolute-time-temporal-logic.html

Changing the name of the event will solve the issue, as the keyword 'tick' cannot be used.

Best Answer

Related Solutions

MATLAB: Do I receive a “Error using Stateflow.​Clipboard/​copy” when I try to update Stateflow library interfaces that contain graphical Stateflow functions that are set to “subchart” in R2017a+

MATLAB: Do I get the error ‘Implicit wakeup or tick events are invalid in charts with input events ‘tick” in Stateflow

Related Question

MATLAB: Do I receive a “Error using Stateflow.Clipboard/copy” when I try to update Stateflow library interfaces that contain graphical Stateflow functions that are set to “subchart” in R2017a+