MATLAB: Error: Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.

MATLAB Runtime Servermethods (acces = private)

     function PruebasdisponiblesButtonGroupSelectionChanged(app, event)
            switch app.PruebasdisponiblesButtonGroup.SelectedObject.Text
                case 'PBU'
                    if app.FuncinDropDownLabel == "Pwf"
                        app.UIAxes.YLabel.String = 'Pwf';
                        app.UIAxes2.YLabel.String = 'Pwf';
                        app.UIAxes3.YLabel.String = 'Pwf';
                    elseif app.FuncinDropDownLabel == "m(p)"
                        app.UIAxes.YLabel.String = 'm(p)';
                        app.UIAxes2.YLabel.String = 'm(p)';
                        app.UIAxes3.YLabel.String = 'm(p)';
                    elseif app.FuncinDropDownLabel == "P^2"
                        app.UIAxes.YLabel.String = 'P^2';
                        app.UIAxes2.YLabel.String = 'P^2';
                        app.UIAxes3.YLabel.String = 'P^2';
                    end
                case 'PDD'
                    if app.FuncinDropDownLabel == "Pwf"
                        app.UIAxes.YLabel.String = 'Pwf';
                        app.UIAxes2.YLabel.String = 'Pwf';
                        app.UIAxes3.YLabel.String = 'Pwf';
                    elseif app.FuncinDropDownLabel == "m(p)"
                        app.UIAxes.YLabel.String = 'm(p)';
                        app.UIAxes2.YLabel.String = 'm(p)';
                        app.UIAxes3.YLabel.String = 'm(p)';
                    elseif app.FuncinDropDownLabel == "P^2"
                        app.UIAxes.YLabel.String = 'P^2';
                        app.UIAxes2.YLabel.String = 'P^2';
                        app.UIAxes3.YLabel.String = 'P^2';
                    end
            end        
        
            end
        end
    end
    % Component initialization
    methods (Access = private)
[SL: formatted code as code]

Best Answer

Smart indent your code in the MATLAB Editor. When I did that for your code sample, there were two end statements after the one that matched the function keyword. Assuming that this is a method in a classdef file the first of those end statements would end the methods block in which that method was defined and the second would end the classdef block. This means the new methods block that you're trying to start falls outside the class definition.
Eliminate the last of those end statements or move it to the end of the class definition.
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