Plotting a legend without displaying data on UIAxes

Hi all,

I want to show a legend without showing the plot data on the app.UIAxes in App Designer. I written the following code but at the end it shows a legend box as an disabled legend (attached figure). How can I correct my code?

I would be apprciated if you kindly guide me.

Many thanks,

Moh

colororder = {'r','g','b','c','m'};

x = rand(100,5);

label = cellstr(num2str([1:1:size(x,2)]', 'cluster%d'));

for i=1:1:size(x,2)

axis(app.UIAxes,'off');

set(app.UIAxes,'visible','off');

f = plot(app.UIAxes,x(:,i),'Color',colororder{i});

hold(app.UIAxes,'on');set(f,'visible','off');

end

hold(app.UIAxes,'on');

set(app.UIAxes,'visible','off');

axis(app.UIAxes,'off');

hold(app.UIAxes,'on');

legend(app.UIAxes,label,'AutoUpdate','off');

[Walter Roberson]

What legend would you like displayed when all of your lines are invisible?

[Mohammad Shahbazy]

I have the lines displayed in a different UIAxes for some reasons in my app, then here only need to have a legend.

Answer 1

[Chris]

colororder = {'r','g','b','c','m'};
 
x = rand(100,5);
label = cellstr(num2str([1:1:size(x,2)]', 'cluster%d'));

% Plot a point but don't grab its handle
plot(app.UIAxes,0,0);
hold(app.UIAxes,'on')

for i=1:1:size(x,2)
    % Get handles to the other plots, which are nan
    f(i) = plot(app.UIAxes,NaN,NaN,'Color',colororder{i});
end

axis(app.UIAxes,'off');
legend(f,label,'AutoUpdate','off');

Adapted from answers here

[Mohammad Shahbazy]

Thanks @Chris

Answer 2

[Simon Chan]

Try this if you would like to show the figure and legend without showing the data.

Set the 'LineStyle' to 'none' to hide the lines.

colororder = {'r','g','b','c','m'};
x = rand(100,5);
label = cellstr(num2str([1:1:size(x,2)]', 'cluster%d'));
fig = figure;
ax = gca;
for i=1:1:size(x,2)
f = plot(ax,x(:,i),'Color',colororder{i},'LineStyle','none');       % Use LineStyle = 'none'
hold(ax,'on');
end
hold(ax,'off');
legend(ax,label,'AutoUpdate','off');

[Mohammad Shahbazy]

Thanks @Simon Chan