How to change name of UIAxes plot when using a button?

I am currently making an app that has a drop down with sinx,cosx, and tanx. One of the three options are selected and then a button is pushed to get the derivative and then it will graph whatever was chosen in the drop down. I would like to make my app change the title to 'Derivitave of sinx' if sinx was chosen from the drop down or 'Derivative of cosx' if cosx was chosen from the drop down. I will attach my code below and design below.

classdef DerivativeCalculator < matlab.apps.AppBase

    % Properties that correspond to app components
    properties (Access = public)
        UIFigure                        matlab.ui.Figure
        derivative                      matlab.ui.control.Label
        Button                          matlab.ui.control.Button
        DerivativeCalculatorGraphLabel  matlab.ui.control.Label
        DropDown                        matlab.ui.control.DropDown
        Label                           matlab.ui.control.Label
        UIAxes                          matlab.ui.control.UIAxes
    end

    % Callbacks that handle component events
    methods (Access = private)

        % Button pushed function: Button
        function ButtonPushed(app, event)
           method = app.DropDown.Value
            
            if method == 'Sinx'

result = 'cosx';

elseif method == 'Cosx'

result = '-sinx';

elseif method == 'Tanx'

result = 'sec^2(x)';

elseif method == 'Cotx'

result = '-csc^2(x)';
elseif method == 'Secx'

 result = 'secxtanx';
elseif method == 'Cscx'

 result = '-cscxcotx';
end

% converting result to 2 decimal numeric string

output = result;

% setting string to label field

app.derivative.Text = output;

% displaying changes

drawnow;
switch method
    case 'Sinx'
        result = 'cosx';
        x = -pi:0.01:pi;
plot(app.UIAxes,x,sin(x))

    case 'Cosx';
        result = '-sinx';
        x = -pi:0.01:pi; 
plot(app.UIAxes,x,cos(x))
    case 'Tanx';
        result = 'sec^2x';
        x = (-pi/2)+0.01:0.01:(pi/2)-0.01;
plot(app.UIAxes,x,tan(x))
end

        end
    end

    % Component initialization
    methods (Access = private)

        % Create UIFigure and components
        function createComponents(app)

            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'MATLAB App';

            % Create UIAxes
            app.UIAxes = uiaxes(app.UIFigure);
            title(app.UIAxes, 'Title')
            xlabel(app.UIAxes, 'X')
            ylabel(app.UIAxes, 'Y')
            zlabel(app.UIAxes, 'Z')
            app.UIAxes.Position = [147 38 358 216];

            % Create Label
            app.Label = uilabel(app.UIFigure);
            app.Label.BackgroundColor = [1 1 1];
            app.Label.HorizontalAlignment = 'center';
            app.Label.FontSize = 18;
            app.Label.FontWeight = 'bold';
            app.Label.Position = [148 293 42 23];
            app.Label.Text = 'd/dx';

            % Create DropDown
            app.DropDown = uidropdown(app.UIFigure);
            app.DropDown.Items = {'Sinx', 'Cosx', 'Tanx', 'Cotx', 'Secx', 'Cscx'};
            app.DropDown.Position = [197 293 100 22];
            app.DropDown.Value = 'Sinx';

            % Create DerivativeCalculatorGraphLabel
            app.DerivativeCalculatorGraphLabel = uilabel(app.UIFigure);
            app.DerivativeCalculatorGraphLabel.BackgroundColor = [1 1 1];
            app.DerivativeCalculatorGraphLabel.HorizontalAlignment = 'center';
            app.DerivativeCalculatorGraphLabel.Position = [245 406 164 22];
            app.DerivativeCalculatorGraphLabel.Text = 'Derivative Calculator & Graph';

            % Create Button
            app.Button = uibutton(app.UIFigure, 'push');
            app.Button.ButtonPushedFcn = createCallbackFcn(app, @ButtonPushed, true);
            app.Button.Position = [329 293 47 23];
            app.Button.Text = '=';

            % Create derivative
            app.derivative = uilabel(app.UIFigure);
            app.derivative.BackgroundColor = [1 1 1];
            app.derivative.HorizontalAlignment = 'center';
            app.derivative.Position = [415 293 89 22];
            app.derivative.Text = '';

            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end

    % App creation and deletion
    methods (Access = public)

        % Construct app
        function app = DerivativeCalculator

            % Create UIFigure and components
            createComponents(app)

            % Register the app with App Designer
            registerApp(app, app.UIFigure)

            if nargout == 0
                clear app
            end
        end

        % Code that executes before app deletion
        function delete(app)

            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

Answer 1

[Walter Roberson]

title(app.UIAxes, "Derivative of " + method)