HOW TO MAKE CODING FOR THIS FORMULA. I'M LITTLE BIT CONFUSING ABOUT STRNUM

(popupmenu in GUI)

~ maximum power,MP =

2KWatt

4KWatt

~ value of resistance,VOR =

user will put any desire value

(pushbutton in GUI)

when press the pushbutton. then the answer will appear

Voltage = MP X VOR

Answer 1

[Geoff Hayes]

nursuhailah - in the push button callback, you would get the value of the pop-up menu and the resistance value text, and do the appropriate calculation. For example,

 function pushbutton1_Callback(hObject, eventdata, handles)

 % get the maximum power
 maxPower = 0;
 maxPowerIdx = get(handles.popupmenu1,'Value');
 if maxPowerIdx == 1
     maxPower = 2;
 elseif maxPowerIdx == 2
     maxPower = 4;
 end

 % get the resistance
 valueOfResistance = str2double(char(get(handles.edit1,'String')));

 % do the calculation
 voltage = maxPower * valueOfResistance;

 % set the resistance
 set(handles.text1,'String',num2str(voltage));

In the above, I'm assuming that your pushbutton is named pushbutton1, the popup menu is named popupmenu1, the resistance edit text field is named edit1, and the static text field where you are writing your answer is named text1. The above is untested but should give you an idea of how to proceed.

[nursuhailah suhaimi]

thank you so much ! :)

[Image Analyst]

If you have R2014b or later, you can do this, which is a more modern, object oriented way of doing it:

handles.text1.String = sprintf('Voltage = %f', voltage);