Gui: equation solving calculator

Hi, I’m making an application that will be able to solve equations using the solve function, but I get an error when trying to calculate equations like x-4, what’s wrong, tell me please

Error in

matlab.graphics.internal.figfi le.FigFile/read>@(hObject,eventdata)super _program('pushbutton5_Callback ',hObject,eventdata,guidata(hO bject))

Error while evaluating UIControl Callback.

function pushbutton5_Callback(hObject, eventdata, handles)
eqn = get(handles.edit1);
X = solve(eqn);
set(handles.edit1,'string',X);

Answer 1

[David Hill]

Not sure if this will help.

eqn ='a*x^2+b*x+c';
var = symvar(eqn);
for k=1:length(var)
    syms(var{k});
end
EQN=eval(eqn)==0;
X=solve(EQN,x);

[Misha Brown]

did not help(

[David Hill]

When you get(handles.edit1), is it a character array or string?