Fix one curve, while change another

Hi dear matlab users. Is it possible to fix one curve on axis and update another one using, for exhample, slider.

Of course i can plot two curves every time i move slider's button:

1) sample curve, that does not change;

2) changeable curve;

But i dont think that this solution is rational.

[darova]

Can you be more specific? Show some examples? ImageS?

Answer 1

[Jon]

Here is one approach. You can modify the YData property of the second curve. Here is a little example

x = 1:10
y1 = x;
y2 = x.^2
p = plot(x,y1,x,y2)
% change second curve to plot the sin(x) instead
% just for demo, pause long enough to see original curve before 
% changing to the new one 
pause(3)
p(2).YData = sin(x)

If you are doing this within a MATLAB GUI built using app designer you could do something like this with your callbacks. In this toy example, the button push make the plot with the original two curves and then the slider modifies the second curve

        % Button pushed function: Button
        function ButtonPushed(app, event)
            % make initial plot
            x = 1:10;
            y1 = x;
            y2 = x.^2;
            plot(app.UIAxes,x,y1,x,y2)
        end

        % Value changing function: Slider
        function SliderValueChanging(app, event)
            changingValue = event.Value;
            % get the current YData for the original curve
            x = app.UIAxes.Children(1).XData; % first child is last curve plotted
            % change the original curve according to slider value
            app.UIAxes.Children(1).YData = changingValue/100*x.^2;% just an example of changing curve
            
        end
    end