Matlab - Necesito graficar en Guide pero solo se pone los nombres de los ejes y no la grafica

% --- Executes on button press in pushbutton1.

function pushbutton1_Callback(hObject, eventdata, handles)

ea_values=[0;21;42;63;84;105.333000000000];

if_values=[0;0.333300000000000;0.6666000000000003];

v_t;

r_f;

% corresponding

e_a0_ref = interp1(if_values,ea_values,5,'spline');

n_ref = 1103;

i_f = v_t ./ r_f;

% Calculate the E_

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

% Calculate

n2 = ( e_a0_ref ./ e_a0 ) * n_ref;

%GRAFICAR

% Plot the speed versus r_f curve.

plot(r_f,n2,'Color','r','LineWidth',4.0);

hold on;

xlabel('Field resistance, \Omega','Fontweight','Bold');

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

title ('Velocidad ');

axis([40 70 0 1400]);

grid on;

hold off;

% hObject    handle to pushbutton1 (see GCBO)

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

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

axes(handles.axes1);

plot(r_f,n2,'Color','r','LineWidth',4.0);

xlabel('Field resistance, \Omega','Fontweight','Bold');

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

title ('Velocidad ');

axis([40 70 0 1400]);

grid on;

clear

ea_values=[0;21;42;63;84;105.333000000000];

if_values=[linspace(0, 0.6666000000000003,length(ea_values))]';

v_t=linspace(ea_values(1),ea_values(end),30);

r_f=linspace(if_values(1),if_values(end),30);

e_a0_ref = interp1(if_values,ea_values,v_t,'spline');

n_ref = 1103;

i_f = v_t ./ r_f;

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

n2 = ( e_a0_ref ./ e_a0 ) * n_ref;

axes(handles.axes1);

plot(r_f,n2,'Color','r','LineWidth',4.0);

xlabel('Field resistance, \Omega','Fontweight','Bold');

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

title ('Velocidad ');

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

grid on