create a class that represents a state machine where a state named "foo" moves to a state named "bar" if input "u" becomes negative in matlab

main.m
classdef MyStateMachine
    % MYSTATEMACHINE represents a simple state machine

    properties
        currentState
    end

    methods
        function obj = MyStateMachine(startState)
            % MYSTATEMACHINE constructs an instance of MyStateMachine class
            %   with a given start state
            obj.currentState = startState;
        end

        function [newState, output] = transition(obj, input)
            % TRANSITION takes an input and moves to a new state
            %   based on the current state and the input

            switch obj.currentState
                case 'foo'
                    if input < 0
                        newState = 'bar';
                        output = 'Negative input received. Transitioned to bar state.';
                    else
                        newState = 'foo';
                        output = 'Positive input received. Staying in foo state.';
                    end
                case 'bar'
                    newState = 'bar';
                    output = 'Cannot transition from bar state. Staying in bar state.';
                otherwise
                    error('Invalid state.');
            end

            obj.currentState = newState;
        end
    end
end
1250 chars
39 lines

main.m
% Example usage
myMachine = MyStateMachine('foo');
[inputValue, isNegative] = deal(-1);
[newState, outputMessage] = myMachine.transition(inputValue);
disp(outputMessage) % 'Negative input received. Transitioned to bar state.'
226 chars
6 lines