MATLAB: How can i update the edit box output in GUI

editboxguihandlesMATLAB

i have attached the full code of a simple IDMT device setting calculator, it is possible for the user to select device number 1 to 6 and each device has seven parameters, all user data is saved in a matrix. the program works fine except for i wish the edit box output data to update and display the correct matrix data when the device number is changed.
on line 189 i am trying to write a value to an edit box, the value is arbitrary for the time being, each time i get 'invalid handle object'
thanks in anticipation, Nathan
function varargout = new(varargin)
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @new_OpeningFcn, ...
                   'gui_OutputFcn',  @new_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT
% --- Executes just before new is made visible.
function new_OpeningFcn(hObject, eventdata, handles, varargin)
clc
handles.internal_data = zeros(7,6);
% Choose default command line output for new
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
function varargout = new_OutputFcn(hObject, eventdata, handles) 
varargout{1} = handles.output;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


function ct_Callback(hObject, eventdata, handles)
ct = str2double(get(hObject, 'String'));
if isnan(ct)
    set(hObject, 'String', 0);
    errordlg('Input must be a number','Error');
end
b = get(handles.dev_sel, 'value')
handles.internal_data(1,b) = ct
handles.internal_data
% Save the new volume value





handles.ct = ct;
guidata(hObject,handles)        %%inputs
function ct_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end
function plug_Callback(hObject, eventdata, handles)
plug = str2double(get(hObject, 'String'));
if isnan(plug)
    set(hObject, 'String', 0);
    errordlg('Input must be a number','Error');
end
b = get(handles.dev_sel, 'value')
handles.internal_data(2,b) = plug
handles.internal_data
% Save the new volume value
handles.plug = plug;
guidata(hObject,handles)
function plug_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end
function time_Callback(hObject, eventdata, handles)
time = str2double(get(hObject, 'String'));
if isnan(time)
    set(hObject, 'String', 0);
    errordlg('Input must be a number','Error');
end
b = get(handles.dev_sel, 'value')
handles.internal_data(3,b) = time
handles.internal_data
% Save the new volume value
handles.time = time;
guidata(hObject,handles)
function time_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end
function vref_Callback(hObject, eventdata, handles)
vref = str2double(get(hObject, 'String'));
if isnan(vref)
    set(hObject, 'String', 0);
    errordlg('Input must be a number','Error');
end
b = get(handles.dev_sel, 'value')
handles.internal_data(4,b) = vref
handles.internal_data
% Save the new volume value
handles.vref = vref;
guidata(hObject,handles)
function vref_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end
function vprot_Callback(hObject, eventdata, handles)
vprot = str2double(get(hObject, 'String'));
if isnan(vprot)
    set(hObject, 'String', 0);
    errordlg('Input must be a number','Error');
end
b = get(handles.dev_sel, 'value')
handles.internal_data(5,b) = vprot
handles.internal_data
% Save the new volume value
handles.vprot = vprot;
guidata(hObject,handles)
function vprot_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end
function para_Callback(hObject, eventdata, handles)
para = str2double(get(hObject, 'String'));
if isnan(para)
    set(hObject, 'String', 0);
    errordlg('Input must be a number','Error');
end
b = get(handles.dev_sel, 'value')
handles.internal_data(6,b) = para
handles.internal_data
% Save the new volume value
handles.para = para;
guidata(hObject,handles)
function para_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end
function listbox1_Callback(hObject, eventdata, handles)     %%listbox inputs
b = get(handles.dev_sel, 'value')
a = get(handles.listbox1, 'value')
handles.internal_data(7,b) = a
handles.internal_data
% Save the new listbox value
guidata(hObject,handles)
function listbox1_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end
function dev_sel_Callback(hObject, eventdata, handles)
b = 1        %get(handles.dev_sel, 'value')
a = num2str (7) %(handles.internal_data(1,b))
handles
set(handles.ct, 'String', a) ;
function dev_sel_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
              % --- Executes on button press in calculate.
  function calculate_Callback(hObject, eventdata, handles)
data_Voltage_ratio = zeros(1,6)
data_coeff = zeros(1,6)
trip_time = zeros(6,12)
fault_mag_series = [1.2, 2,3,4,5,6,7,8,9,10,20];
extremely = [80  , 2   ];                                                                   %scalar , exp
very      = [13.5, 1   ];
standard  = [0.14, 0.02];           
long_time = [120 , 1   ];
x = 1                                                                                       % repeated for each device
while x < 7
      data_Voltage_ratio(x) = handles.internal_data(5,x) / handles.internal_data(4,x);        % v/r   = vprot / vref
      data_Voltage_ratio(isnan(data_Voltage_ratio))=0;                                        % replace nan with zero
      data_coeff(x) = handles.internal_data(6,x) * handles.internal_data(2,x);                % coeff = para * plug
      m=1;
          while m<12  
              fault_current_PU(x,m) = data_coeff(x) * fault_mag_series(m);                    % populates fault current values 
              fault_current_corrected(x,m) = fault_current_PU(x,m)* handles.internal_data(1,x) * data_Voltage_ratio(x) /1000;
              if handles.internal_data(7,x) == 2
                  trip_time(x,m) = (extremely(1)*handles.internal_data(3,x))  / (((fault_current_PU(x,m) / (handles.internal_data(2,x) * handles.internal_data(6,x)))^extremely(2))-1)
              elseif handles.internal_data(7,x) == 3
                  trip_time(x,m) = (very(1)*handles.internal_data(3,x))  / (((fault_current_PU(x,m) / (handles.internal_data(2,x) * handles.internal_data(6,x)))^very(2))-1)
              elseif handles.internal_data(7,x) == 4
                  trip_time(x,m) = (standard(1)*handles.internal_data(3,x))  / (((fault_current_PU(x,m) / (handles.internal_data(2,x) * handles.internal_data(6,x)))^standard(2))-1)
              elseif handles.internal_data(7,x) == 5
                  trip_time(x,m) = (long_time(1)*handles.internal_data(3,x))  / (((fault_current_PU(x,m) / (handles.internal_data(2,x) * handles.internal_data(6,x)))^long_time(2))-1)
              end
              m=m+1;
          end
          if handles.internal_data(7,x)~= 1
              loglog (fault_current_corrected(x,1:11), trip_time(x,1:11))
              grid on
              hold on
              title('Required Protection Settings');   
              xlabel('Fault Current (KA)')
              ylabel('Time to Operate (Seconds)')
              axis([0.01 100 0.1 100])
          end
      x=x+1;
  end    
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Best Answer

i have used this method you suggest
set(handles.ct, 'String', num2str(handles.internal_data(1,b))
in the following form
function dev_sel_Callback(hObject, eventdata, handles)
b = get(handles.dev_sel, 'value')
c = (handles.internal_data(1,b))
set(handles.ct, 'string', num2str(c))
which works perfectly!!
thank you all very much
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