Creating Graphical User Interfaces

Running the Simulation from the GUI

The GUI Simulate and store results button callback runs the model simulation and stores the results in the handles structure. Storing data in the handles structure simplifies the process of passing data to other subfunction since this structure can be passed as an argument.

When a user clicks on the Simulate and store results button, the callback executes the following steps.

• Calls sim, which runs the simulation and returns the data that is used for plotting.
• Creates a structure to save the results of the simulation, the current values of the simulation parameters set by the GUI, and the run name and number.
• Stores the structure in the handles structure.
• Updates the list box String to list the most recent run.

The following code lists the Simulate and store results button callback.

function varargout = SimulateButton_Callback(h,eventdata,handles,varargin)
[timeVector,stateVector,outputVector] = sim('f14');
% Retrieve old results data structure
if isfield(handles,'ResultsData') & ~isempty(handles.ResultsData)
    ResultsData = handles.ResultsData;
    % Determine the maximum run number currently used.
    maxNum = ResultsData(length(ResultsData)).RunNumber;
    ResultNum = maxNum+1;
else 
    % Set up the results data structure
    ResultsData = struct('RunName',[],'RunNumber',[],...
        'KiValue',[],'KfValue',[],'timeVector',[],'outputVector',[]);
    ResultNum = 1;
end
if isequal(ResultNum,1),
    % Enable the Plot and Remove buttons
    set([handles.RemoveButton,handles.PlotButton],'Enable','on')
end
% Get Ki and Kf values to store with the data and put in the results list.
Ki = get(handles.KiValueSlider,'Value');
Kf = get(handles.KfValueSlider,'Value');
ResultsData(ResultNum).RunName = ['Run',num2str(ResultNum)];
ResultsData(ResultNum).RunNumber = ResultNum;
ResultsData(ResultNum).KiValue = Ki;
ResultsData(ResultNum).KfValue = Kf;
ResultsData(ResultNum).timeVector = timeVector;
ResultsData(ResultNum).outputVector = outputVector;
% Build the new results list string for the listbox
ResultsStr = get(handles.ResultsList,'String');
if isequal(ResultNum,1)
    ResultsStr = {['Run1          ',num2str(Kf),' ',num2str(Ki)]};
else
    ResultsStr = [ResultsStr;...
    {['Run',num2str(ResultNum),' ',num2str(Kf),' ',num2str(Ki)]}];
end
set(handles.ResultsList,'String',ResultsStr);
% Store the new ResultsData
handles.ResultsData = ResultsData;
guidata(h,handles)

Programming the Slider and Edit Text Components

Removing Results from the List Box