Read data from editing text in GUI
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Antonio Tricarico
le 8 Août 2020
Commenté : Antonio Tricarico
le 12 Août 2020
Hi guys, I need support about reading data from Matlab GUI.
In particular, I've written this code in my GUI but when I'm pushing on PUSHBUTTON1 it gives error Error while evaluating uicontrol Callback Undefined variable "handles" or class "handles.edit2".
The program doesn't read value for variable zeta, whilst the variable interval works.
How could I resolve this?
Thank you for your support.
function pushbutton1_Callback(hObject, eventdata, handles)
interval=str2double(get(handles.edit1,'string'));
t=0:interval:10;
initial_x = 0;
initial_dxdt = 0.1;
x0=[initial_x initial_dxdt];
[t,x]=ode45( @rhs, t, [initial_x initial_dxdt]);
plot(t,x(:,1))
function dxdt=rhs(t,x)
m=1;
k=10;
omega_n=sqrt(k/m);
zeta=str2double(get(handles.edit2,'string'));
F=sin(10*t);
dxdt_1 = x(2);
dxdt_2 = -2*zeta*omega_n*x(2) -(omega_n)^2*x(1) + sin(10*t);
dxdt=[dxdt_1; dxdt_2];
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Cris LaPierre
le 9 Août 2020
Modifié(e) : Cris LaPierre
le 9 Août 2020
Keep in mind variable scope for functions. Look at the inputs to your function rhs
function dxdt=rhs(t,x)
The handles structure is not an input to this function, so it is not accessible inside it. This is what is causing the error in your calculation of zeta.
Try making handles an input to your function, or make the value of edit2 an input to rhs.
4 commentaires
Cris LaPierre
le 11 Août 2020
Modifié(e) : Cris LaPierre
le 11 Août 2020
You need to call a function with all its inputs. example, which you pass in as f to adamsbash, has 3 inputs: t,x, and handles.
function f=example(t,x,handles)
However, when you first use it to compute k1, you call it with only two inputs, a and x0. Hence the error message that there are not enough input arguments. You didn't include handles.
k1=feval(f, a, x0)';
Every time you call the function example you need to provide 3 inputs. When calculating k1, that means doing something like this:
k1=feval(f, a, x0,handles)';
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