Hold off in uitab does not seem to work?

Hi,

I am trying to programmatically code a simple asset allocation app. I would like the efficient frontier and the associated asset returns to display in another tab, and if the user changes the expected returns, the efficient frontier is updated in the second tab.

The code below works, but the axes are not reset when the user changes the expected return, so the axes are overwritten as shown in the figure. It seems that the hold(ax,'off'); is not working. What am I doing wrong? I have also tried cla(ax,'reset') and ax=newplot(ax);

Example expected returns used as input were [0.23,0.15,0.11] and then [0.14,0.15,0.11].

Thank you!

function []=testApp()

    function parButtonPushed(C)
    
        ft=findobj(fig,'Tag','tab2');
        er=findobj(fig,'Tag','er');
        erData=table2array(er.Data);
        tabg=findobj(fig,'Tag','tabg');
        p=Portfolio('RiskFreeRate',0.001);
        p = setAssetMoments(p,erData,C);    
        p = setDefaultConstraints(p);
        ax = axes('parent',ft);
        cla(ax, 'reset'); % also tried
        ax=newplot(ax); % also tried
        plotFrontier(ax,p,100);
        hold(ax,'on');
        scatter(sqrt(diag(C)),erData,20,'filled',"MarkerFaceColor",'#808080','Parent',ax);
        hold(ax,'off');
        tabg.SelectedTab=ft;
    end


    fig = uifigure;
    fig.Position(3)=850;
    fig.Position(4)=440;
    movegui(fig,'center');
    
    tabgp = uitabgroup(fig);
    tabgp.Position(3)=650;
    tabgp.Position(4)=340;
    tabgp.Tag='tabg';

    
    tab1 = uitab(tabgp,"Title","Expected Returns");
    tab2 = uitab(tabgp,"Title", "Output");
    tab2.Tag='tab2';
    
    g = uigridlayout(tab1,[2,1]);
    g.RowHeight = {99,22};
    g.ColumnWidth = {'fit','fit'};

    er=zeros(3,1);
    C=[0.030766915	0.0252445	0.007653981;
       0.0252445	0.049854359	0.011371085;
       0.007653981	0.011371085	0.009284787];

    t1=array2table(er,"VariableNames","Expected Return","RowNames",{'Asset 1','Asset 2','Asset 3'});
    t11=uitable(g,"Data",t1);
    t11.Tag='er';
    t11.ColumnEditable = repelem(true,1);
    
    btab1=uibutton(g,'Text','Continue',"ButtonPushedFcn", @(src,event) parButtonPushed(C));
    btab1.Layout.Row=2;
    btab1.Layout.Column = 1;
    
end

Answer 1

[Walter Roberson]

        ax = axes('parent',ft);

Each time you execute that statment, you generate a new axes to plot in.

You instead need something like

        ax = gca(ft);

gca() will fetch the current axes if one exists, and will otherwise create a new axes within the given parent.

[Old Newbie]

Thanks for your reponse, and perhaps my problem statement was not clear.

If the user changes the inputs, I would like the previous axes to be removed/deleted and a completely new axes be created. At the moment, it plots the new axes on top of the old axes.

How can I delete the previous axes (I have tried cla(ax) but it does not work)? I have also tried you solution (ax=gca(ft)) and it still creates overlapping axes as per the picture.

[Walter Roberson]

delete(gca(ft))

[Old Newbie]

Thank you, however, that still did not work. It does not delete the axes so the original axes still appear and are still overlapping.

I sorted it out by deleting all the children in the tab before I create the axes i.e.

delete(get(ft,'Children'));
ax = axes('parent',ft);