pop-up menu (GUI,guide)

hi,

I have a school project, I need to use Matlab GUI to create a calculator and unit converter i used Guide

I have a problem in unit conversion code, I keep getting the error "Unknown function or 'main list' variable."

and nothing appears in the output screen.

I appreciate the help, thanks in advance for your time.

i'll attach the code

Answer 1

[Walter Roberson]

Before

if mainList=='temperature'
    if innerList1=='Celsius'
       if innerList2=='Fahrenheit' 

insert

mainList_options = handles.mainList.String;
mainList_value = handles.mainList.Value;

innerList1_options = handles.innerList1.String;
innerList1_value = handles.innerList1.Value;

innerList2_options = handles.innerList2.String;
innerList2_value = handles.innerList2.Value;

%at this point you really should check to be sure that the _value
%variables are not empty: if they are then it means nothing has been
%selected in that list.

%check for empty here

%then

mainList = string( mainList_options{mainList_value} );
innerList1 = string( innerList1_options{innerList1_value} );
innerList2 = string( innerList2_options{innerList2_value} );

[Tahani Alajmi]

Thank you for responsing to my question.

Can you please explain more on how can i check if the var are empty or not?

i added the options on the pop-up menu in the guide window do i need to add it somewhere else?