Matlab - No se carga archivo tipo .mat para realizar demas calculos y graficar en guide de matlab

% --- Executes on button press in pushbutton3.

function pushbutton3_Callback(hObject, eventdata, handles)

% three variables if_value, ea_value, and n_0.

%cargar archivo .mat q contiene las demas variables

load fig9_9.mat

% First, initialize the values

v_t = 120;

r_f = 25;

r_a = 0.06;

i_l = 10:10:300;

n_f = 1000;

f_ar0 = 500;

% Calculate the armature current for each load.

i_a = i_l - v_t / r_f;

% Now calculate the internal generated voltage for

% each armature current.

e_a = v_t - i_a * r_a;

% Calculate the armature reaction MMF for each armature

% current.

f_ar = (i_a / 200) * f_ar0;

% Calculate the effective field current.

i_f = v_t / r_f - f_ar / n_f;

% Calculate the resulting.

e_a0 = interp1(if_values,ea_values,i_f,'spline');

% Calculate the resulting s

n = ( e_a ./ e_a0 ) * n_0;

% Calculate the induced torque corresponding to each

% speed from Equations (8-55) and (8-56).

t_ind = e_a .* i_a ./ (n * 2 * pi / 60);

% Dibujar

plot(t_ind,n,'Color','k','LineWidth',2.0);

hold on;

xlabel('\tau_{ind} (N-m)');

ylabel('\itn_{m} \rm\bf(r/min)');

title ('\bfShunt DC motor torque-speed characteristic');

axis([ 0 600 1100 1300]);

grid on;

hold off;

% hObject    handle to pushbutton3 (see GCBO)

% eventdata  reserved - to be defined in a future version of MATLAB

% handles    structure with handles and user data (see GUIDATA)

load fig9_9.mat

whos

otra opcion: en la ventana de comandos digita la sentencia:

>>clear

>>whos

>>load fig9_9.mat

>>whos

Name         Size            Bytes  Class     Attributes

  x         3055x1             24440  double

  y         3055x1             24440  double

axis([min(r_f) max(r_f) min(n2) max(n2)]);