Displaying figure from function in MATLAB gui

Hello, I have this function that takes a value Val and returns a 3D plot of two curves z1 and z2 with a dotted red line where they intersect with Val.

function Plot(Val) 

X = [0:0.5:5];
Y = [0:0.1:1];
[x,y] = meshgrid(X,Y);


z1 = [x.*y.*57.5];
z2 = [x.*y.*110];


figure(1)
surf(x,y,z1, 'FaceAlpha', 0.5)
colormap winter
shading interp

hold on

surf(x,y,z2, 'FaceAlpha', 0.5)
shading interp
xlim([0 5])
ylim([0 1])
zlim([0 450])

Xg = x(1,:);
Yg = y(:,1);
hold on
M1 = contour3(Xg, Yg, z1, [CharVal,CharVal], '--r');
M2 = contour3(Xg, Yg, z2, [CharVal, CharVal], '--r');

I'm trying to create an app in the MATLAB gui where I have a slider for Val and would be able to see the intersection point change in real time. I currently am trying to use just a numeric input field for the value, but I can't get the figure to plot in my GUI.

% Button pushed function: ExecuteButton
        function ExecuteButtonPushed(app, event)
            CharVal = app.EffValueEditField.Value;
            EnergyEff(CharVal);
            plot(, 'Parent', app.UIAxes);

        end

Inputting a value and clicking the 'Execute' button gives me the plot but outside of the GUI. Any help is appreciated

[Voss]

Is "CharVal" related to "Val"?

Answer 1

[Walter Roberson]

function Plot(Val, ax) 
    X = [0:0.5:5];
    Y = [0:0.1:1];
    [x,y] = meshgrid(X,Y);
    
    
    z1 = [x.*y.*57.5];
    z2 = [x.*y.*110];
    
    
    surf(ax, x, y, z1, 'FaceAlpha', 0.5)
    colormap(ax, 'winter')
    shading(ax , 'interp')
    
    hold(ax, 'on')
    
    surf(ax, x, y, z2, 'FaceAlpha', 0.5)
    shading(ax, 'interp');
    xlim(ax, [0 5])
    ylim(ax, [0 1])
    zlim(ax, [0 450])
    
    Xg = x(1,:);
    Yg = y(:,1);
    hold(ax, 'on')
    M1 = contour3(ax, Xg, Yg, z1, [CharVal,CharVal], '--r');
    M2 = contour3(ax, Xg, Yg, z2, [CharVal, CharVal], '--r');
end


% Button pushed function: ExecuteButton
        function ExecuteButtonPushed(app, event)
            CharVal = app.EffValueEditField.Value;
            Plot(CharVal, app.UIAxes);
        end