How do I update plots in a separate GUI window made in GUIDE?

I have a program that I'm putting together that plots data in a separate GUI window. As the user interacts with GUI 1 there comes a point where they will press a button to generate a plot. The plot is displayed in a separate GUI window. Here's some pseudo code

GUI 1:

function pushButton_Callback(handles, hObject)
    do something
    gui2functioncall(handles);

GUI 2:

function gui2_OpeningFcn(hObject, eventdata, handles, varargin)
    handles.gui1handles = varargin{1};
    handles = initializeplotparams(handles);
    [x,y] = calcPlotData(handles);
    plotData(x,y);

    guidata(hObject, handles)

function plotData(x,y)
    plot(handles.axes1, x, y);

So there will be a point when the user is manipulating GUI 1 where they will hit the button to plotData again to plot new data. I originally had it so that I would check if GUI 2 was open by using the findobj function and closing the object if it returned something. However, I would like to keep the window up and just update the axes inside the GUI. Is there an elegant way of doing so?

I thought about using the set() function to set the XData and YData, but I'm not sure how to specify the axes in GUI 2.

Any help is appreciated. Thank you!

Answer 1

[Walter Roberson]

fig1 = gcf();
fig2 = figure(2,'Position, ....);
ax2 = axes('Parent', fig2);
handles.ax2 = ax2;
guidata(fig1, handles);

Now you can

plot(handles.ax2, ....)

or

image(DATA, 'Parent', handles.ax2)

and so on.