MATLAB: Rapid Stateflow.Transition finding

stateflow apistateflow transitions

Is there a rapid way to find all the 'Stateflow.Transition' from a state A, to a state B?

Best Answer

You can do that using a simple MATLAB script using the Stateflow API. Find the Stateflow API below: http://www.mathworks.com/help/stateflow/programmatic-manipulation.html

Here is a simple example that looks for transitions between the states "upshifting" and "steady_state". To run the example, open the model sf_car and run the following code:

rt = sfroot;
transArray = rt.find('-isa','Stateflow.Transition');
len_transarray = length(transArray);
x = zeros(len_transarray,1);
y = zeros(len_transarray,1);
for i = 1: len_transarray
        if ~isempty(strfind(get(get(transArray(i),'Source'),'LabelString'),'upshifting'))
            x(i) = i;
        end
        if ~isempty(strfind(get(get(transArray(i),'Destination'),'LabelString'),'steady_state'))
            y(i) = i;
        end
end
output = transArray(find(x>0 & y > 0))

Related Solutions

MATLAB: Modify Transition condition of Stateflow with script

There is a way to modify a transition condition in Stateflow.

To do that, you will need to use the Stateflow API. You can find a quick start guide in the following documentation link:

https://www.mathworks.com/help/stateflow/api/quick-start-for-the-stateflow-api.html

When you reach step 6 of this example, you will notice that you can modify the LabelString property of the transition. There you can set it equal to a condition. For example:

trans1_2.LabelString = '[u>0]'

assuming that trans1_2 is the transition handle.

Given that, you first need to find that handle. In the following documentation page:

https://www.mathworks.com/help/stateflow/api/accessing-existing-stateflow-objects.html

you can find information on how to access Stateflow Objects programmatically. Specifically, the following command:

transArray = sA.find('-isa','Stateflow.Transition');

returns an array of all the transitions. Using that, you can find the handle you are looking for, and then modify the LabelString property to your needs.

MATLAB: Is there a function in Stateflow to determine how a particular “Data Store Memory” data object is being used by a Stateflow chart

The ability to determine how a particular "Data Store Memory" data object is used in a Stateflow chart is not available in Stateflow.

To work around this issue, you can write your own MATLAB file function that uses the Stateflow API to obtain the expressions in a transition, state, or other chart object that indicate how the "Data Store Memory" is being used. As an example, you might use the following commands in the Stateflow API to access expressions in a transition and state:

rt = sfroot;
m = rt.find('-isa', 'Simulink.BlockDiagram', '-and', 'Name','myModel');
chart = m.find('-isa','Stateflow.Chart','-and','Name','mychart');
trans = find(chart, '-isa','Stateflow.Transition'); %Get all transitions
states = find(chart, '-isa','Stateflow.State'); %Get all states
transString = trans(1).LabelString; %Get the expressions in the first transition
statesString = states(1).LabelString; %Get the expressions in the first state

One way to determine if the "Data Store Memory" data object is being read from or written to is to see if it is on the right or left side of an "=" sign. You can determine this by parsing the transString and statesString strings. You can also use the STRFIND command to get the location of the "Data Store Memory" variable and the "=" sign in the expressions contained in transString and statesString strings.

Best Answer

Related Solutions

MATLAB: Modify Transition condition of Stateflow with script

MATLAB: Is there a function in Stateflow to determine how a particular “Data Store Memory” data object is being used by a Stateflow chart

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