GUI Error Message in the use of a push button and it is NOT the addition of 'guidata(hObject, handles);' that is missing

These are all of the input values for my GUI which are being converted into numbers.

rmin=str2num(get(handles.inputrmin,'String'));

thetamin=str2num(get(handles.inputthetamin,'String'));

thetamax=str2num(get(handles.inputthetamax,'String'));

BOC=str2num(get(handles.inputBOC,'String'));

OC=str2num(get(handles.inputOC,'String'));

m=str2num(get(handles.inputm,'String'));

rmax=str2num(get(handles.inputrmax,'String'));

A function is then used which calculates outputs below

opt_a, opt_b, Fmin/1000, opt_phi

These are then converted back to strings

a1=num2str(opt_a);

b1=num2str(opt_b);

Fmin1=num2str(Fmin/1000);

phi1=num2str(opt_phi);

phi1D=rad2deg(phi1);

set(handles.outputopt_a,'String',a1);

set(handles.outputopt_b,'String',b1);

set(handles.outputOptimum_Force_KN,'String',Fmin1);

set(handles.outputopt_phi,'String',phi1D);

guidata(hObject, handles);

I am getting the following error message

??? Reference to non-existent field 'outputopt_a'.

Error in ==> GUI>calculate_Callback at 371
set(handles.outputopt_a,'String',a1);

I have checked the GUI static text box which is to recieve the output and the tag is 'outputopt_a' so there is no difference here. Any idea where i have gone wrong?

Answer 1

[karan]

check calculation for opt_a...can u post the function

if opt_a is computed in a different function u need to store it in that function and get the same data to this new function where u give commands for set

[karan]

do

handles.set_my_field = opt_a

in function where u computed

do a guidata(hObject, handles); at the end of the same function

by this you are saving the handles such that it can be used by other functions later.

no w in the function where u give commands to set your values

opt_a = handles.set_my_field

this would give u access back to the same values of opt_a in the other function where u desire it to be

[David Fraser]

Thanks for your quick response but after a bit of tweaking (not exactly sure what) its running fine :)