Setting the UserData property of a plot with max and min values

Hello, I am wanting to normalise a plot (between 0 and 1) with the option of undoing it.

This is my code to perform the normalisation.

    ax=app.UIAxes;
    [x,y] = getDataFromGraph(app,ax,1);       % My function get get the XData & YData of a plot
    mx=max(y(:));  mn=min(y(:));      
    y_normalized = normalize(y, 'range');     % This ensures max and min are 0 and 1   
    b=ax.Children;                            % b(1) is last object added to uiaxes 
    b(1).YData=y_normalized;                  % Neat way to change data without actully deleting it
                                              % and retains all it properties such as colour
    
    % Add the max and min values of the raw data to userdata
    p=b(1)                        % Get last plot handle   
    p.UserData                    % See current value
    set(p.UserData,mx)            % Set mx
    p.UserData                    % View agin to make sure its what we want
    

But this is leaving userdata as empty

                   Tag: ''
                  Type: 'line'
              UserData: []
               Visible: on
                 XData: [1.00 121.00 241.00 361.00 481.00 601.00 721.00 841.00 961.00 1081.00 1201.00 1321.00 1441.00 1561.00 1681.00 1801.00 1921.00 … ] (1×136 double)
             XDataMode: 'manual'
             

What am I doing wrong and how can I include both mx and mn in the userdata entry?

Answer 1

[Jason]

Think I have the answer, this works

p.UserData                    % See current value
p.UserData=[mx,mn]            % Set mx & mn
p.UserData 

Answer 2

[Stephen23]

"What am I doing wrong and how can I include both mx and mn in the userdata entry?"

You made up some syntax. Better to use the syntax given in the SET documentation:

set(p,'UserData',mx)

or just assign directly to that property:

p.UserData = mx

[Jason]

Yes I noticed that, thanks