Create drop down menu to change values of y on a graph.

Hello I'm wanting to create a plot that changes the values of y based on user selection from a drop down menu.

I'm thinking it's similar to this example that changes the colour but obviously I would like to change the values of y.

I've tried to use a callback function to change the value of y but I can't figure out how to implement it correctly.

function plotOptions
fig = uifigure; 
fig.Position(3:4) = [440 320];

ax = uiaxes('Parent',fig,...
    'Position',[10 10 300 300]);

x = linspace(-2*pi,2*pi);
y = sin(x);
p = plot(ax,x,y);
p.Color = 'Blue';

dd = uidropdown(fig,...
    'Position',[320 160 100 22],...
    'Items',{'Red','Yellow','Blue','Green'},...
    'Value','Blue',...
    'ValueChangedFcn',@(dd,event) selection(dd,p));
end

% Create ValueChangedFcn callback:
function selection(dd,p)
val = dd.Value;
p.Color = val;
end

Answer 1

[Sulaymon Eshkabilov]

Here is a completed code with two dropdown menus:

function plotOptions
fig = uifigure; 
fig.Position(3:4) = [440 320];
ax = uiaxes('Parent',fig,...
    'Position',[10 10 300 300]);
x = linspace(-2*pi,2*pi);
y.A = sin(x); 
y.B = cos(x); 
y.C = sinc(x);  
y.D = tan(x); 
y.E = exp(x);  
p = plot(ax,x,y.A); 
p.Color = 'Blue';
dd = uidropdown(fig,...
    'Position',[320 160 100 22],...
    'Items',{'Red','Yellow','Blue','Green'},'Value','Blue',...
    'ValueChangedFcn',@(dd,event) selection(dd,p));
N = uidropdown(fig,  'Position',[320 100 100 22],...
    'Items',{'sin()','cos()','sinc()','tan()', 'exp()'},'Value','sin()', ...
    'ValueChangedFcn', @(N, event) YD(N, p, y));
end
% Create ValueChangedFcn callback:
function selection(dd,p)
val = dd.Value; p.Color = val;
end

function YD(N, p, y)
switch N.Value
    case 'sin()'
        val = y.A; 
    case 'cos()'
        val = y.B; 
    case 'sinc()'
        val = y.C;
    case 'tan()'
        val = y.D;
    case 'exp()'
        val = y.E;
    otherwise
        error('WHAT?!')
end
    p.YData = val;
end

[steve geddes]

Hi thanks for the help!

Is there a way to plot two sets of data on the same plot so they update based on the drop down menus?

So instead of colour for the one drop down menu you could select a second function.

Meaning you could select cos and sin to display at the same time. Then you could change one to tan or whatever else?