MATLAB GUI Error while using set - matlab

Question

why I cant have the output in the edit text?
% --- Executes on button press in f.
function f_Callback(hObject, eventdata, handles)
% hObject handle to f (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
clc
syms t
a=str2double(get(handles.b1,'string'));
b=str2double(get(handles.c1,'string'));
y=eval(get(handles.a1,'string'));
u=a-b;
m=abs(y).^2;
r=int(m,t);
g1=subs(r,t,a);
h=subs(r,t,b);
fh=g1-h;
s=fh./u
set(handles.e,'string',s)';
Command window shows the answer not edit text.The error is:
Error using set
error: mxArray must be double, char, or cell
Error in signalproject2>f_Callback (line 284)
set(handles.e,'string',s)';
Error in gui_mainfcn (line 96)
feval(varargin{:});
Error in signalproject2 (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in #(hObject,eventdata)signalproject2('f_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback
Can u please help me with this?

Answer 1

What is the data type of s? Use whos s to find out.
If it's not a double, char, or cell then you won't be able to assign it as a string for your edit box. This is exactly what the error message tells you.
I don't have the symbolic math toolbox so I can't check the code, but I'm guessing s is a symbolic array. If this is the case, see the documentation for char to convert the symbolic array to a string so you can assign it properly.

Answer 2

Could it simply be because there is a ' you don't want at the end of this line:
set(handles.e,'string',s)';
what if you try:
set(handles.e,'string',s);