Prof. Muhammad Saeed

Mathematical Modeling and Simulation

UsingMATLABMATLAB

Graphic User Interface (GUI)Basics

GUI Basics:1. uicontrols • Edit Text

• Static Text Label• Push Button• Radio Button• Button Group• Slider

• Check Box• Panel• List Box• Pop-up Menu• Toggle Button• Table• Axes• Menu• Toolbar

2Modeling & Simulations

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Edit Textfunction edittext1_Callback(hObject, eventdata, handles)

s = get(hObject, 'String');set(hObject, ‘String’, s);% if number, use ‘num2str’ or ‘str2num’n = str2num(get(hObject,'string'));if isnan(n) errordlg(‘Enter a numeric value',’Input Error','modal'); uicontrol(hObject);

returnend

end Pushbutton

function pushbutton1_Callback(hObject, eventdata, handles)plot( ……… );…………..;end

Modeling & Simulations

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Radiobuttonfunction radiobutton1_Callback(hObject, eventdata, handles)

if (get(hObject,'Value') == get(hObject,'Max'))do something

elsedo nothing

endset(handles.radiobutton1,'Value','Max‘)

endCheckboxfunction checkbox1_Callback(hObject, eventdata, handles)

if (get(hObject,'Value') == get(hObject,'Max'))%do something

else%do something else

end% can be used in a groupbox with other uicontrols

Modeling & Simulations

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Panel function uipanel1_ResizeFcn(hObject, eventdata, handles)

set(hObject,'Units','Points‘) % Was normalizedpanelSizePts = get(hObject,'Position'); % Now in pointspanelHeight = panelSizePts(4);set(hObject,'Units','normalized'); % Now normalized again% Keep fontsize in constant ratio to height of panelnewFontSize = 10 * panelHeight / 115; % Calculated in

pointsbuttons = get(hObject,'Children');set(buttons(1),'FontSize‘,newFontSize);% Resize the first

button% Do not resize the other button for comparison

end Listbox

function listbox1_Callback(hObject, eventdata, handles)index = get(hObject,'Value');list = get(hObject,'String');item = list{index}; set(handles.listbox1,'Value',2)

end

Modeling & Simulations

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Popupmenu%Using value

function popupmenu1_Callback(hObject, eventdata, handles)val = get(hObject,'Value');switch val

case 1% code

case 2%code

endend

%Using String

function popupmenu1_Callback(hObject, eventdata, handles)val = get(hObject,'Value');list = get(hObject,'String');str = list{val}; % Convert from cell array to string

end

Modeling & Simulations

8Modeling & Simulations

Problem IPlanck’s Radiation Law is formulated as:

where ‘R’ is the spectral radiance and ‘T’ is temperature in Kelvins and ‘’ is wavelength of radiation

1) Simulate the Law by plotting ‘R’ vs ‘’ for different values of ‘T’.

‘’ range = 0.01m to 8m‘T’ range = 500K to 2500K and let user change the temperature ‘T’

2) Display temperature at each step.3) Display maximum Spectral Radiance ‘R’ at each step4) Display wavelength at at each ‘R’5) Draw a vertical line between ‘R’ and corresponding wavelength at each step.

9Modeling & Simulations

Problem II

T(C) -20 0 40 100 200 300 400 500 1000

x10-5 1.63 1.71 1.87 2.17 2.53 2.98 3.32 3.64 5.04

The above table gives the viscosity ( ) of air at different temperatures (T)Viscosity is expresed as:

‘C’ and ‘S’ are constantsDetermine ‘C’ and ‘S’ by curve-fitting using the above equation.

Plot a graph between ‘T’ and ‘’ for given data (only markers) and plot a line graph using the equation.Calculate the error.

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Modeling & Simulations