Plotting variables in app designer?

Hi, i created two dropdown objects in appdesigner and used this code for each object. It allows me to import variables from workspace.

function startupFcn(app)
  vars = evalin('base', 'whos');
    cell_array = cell(size(vars));
    for i=1:length(vars)
      cell_array{i} = vars(i).name;
    end
    app.XDropDown.Items = cell_array;
end

Now, i want to plot a graph with this variables.

How can i create a push button to plot?

I tried

function DrawButtonPushed(app,event) 
  xdropdown=app.XDropDown.Value;
  ydropdown=app.YDropDown.Value;
  plot(app.UIAxes,xdropdown,ydropdown)
end

But it gives error and says "Error using plot. Not enough arguments."

Thanks in advance!

Answer 1

[Ameer Hamza]

You are getting this error because plot() require double as a second and third argument whereas you are providing its char array. Remember, although you have loaded names of all variables in the drop-down menu, it is simply name of the variable, not the numeric value. Change the plot command like this

plot(app.UIAxes, evalin('base', xdropdown), evalin('base', ydropdown));

[kbra htice]

Thank you for your answer but it is not working for every variable. It only plots graph when the x and y variable are same.