How can I draw a line over a 2D surface plot in an app?

I'm trying to draw a line on this plot when a function is triggered:

The function is below, it includes the creation of the surface plot above:

 % Value changed function: NSLineSelectorSpinner
        function NSLineSelectorSpinnerValueChanged(app, event)
            value = app.NSLineSelectorSpinner.Value;
            
            Bat = mvf_plane([app.minc,app.mdec,app.m],app.Ba_mag,app.Ba_inc,app.Ba_dec,30,1,app.alt);
            
            Max = max(Bat,[],'all');
            Min = min(Bat,[],'all');
            
            plot(app.UIAxes,Bat(:,value))
            xlim(app.UIAxes,[0 60]);
            ylim(app.UIAxes,[Min Max]);
            ytickformat(app.UIAxes,'%g'); 
            ax = app.UIAxes;
            ax.YAxis.Exponent = 0;
                
            surf(app.UIAxes2,Bat);
            ylim(app.UIAxes2, [0 60]);
            xlim(app.UIAxes2, [0 60]);
            view(app.UIAxes2,2);
            app.UIAxes2.PositionConstraint = 'outerposition';
            

When the user changes the value on a spinner, a matrix ("Bat") is recalculated and the profile graph (UIAxes) and surface plot (UIAxes2) are remade. I would like to draw a vertical line along the y-axis of the surface plot at whatever "value" currently is ("value" will be along the x-axis). This is meant to just highlight whichever line is selected by the spinner without having the app open up another figure.

Thank you.

Answer 1

[SALAH ALRABEEI]

yline(put the value)

[Joshua Mitchell]

That worked! I went with:

xline(app.UIAxes2,value,'Color','red','LineStyle','--','LineWidth',1.5);

Do you know if xline will work on a 3D plot as well?

[SALAH ALRABEEI]

yes sure, it works along the x axis.