Error. Movie contains uninitialized frames

I'm trying to make a film with this code:

clc;
clear all;
m1= input('masa 1');
m2= input('masa 2');
L1= input('longitud 1');
L2= input('longitud 2');
g= input('gravedad');
Tfin= input('tiempo final');
DT= input('intervalo de momentos');
alpha= input('angulo alpha');
beta= input('angulo beta');
u= input('velocidad inicial');
%%Cálculos
%%1
NT= Tfin/DT;
C= linspace(0,Tfin,NT);
%%2
X1(1)= L1*sin(alpha);
Y1(1)= -L1*cos(alpha);
X2(1)= X1(1)+L2*sin(beta);
Y2(1)= Y1(1)-L2*cos(beta);
%%3
A= prepara_pend(m1,m2,L1,L2,g,DT);
%%4
V= transpose([alpha,beta,0,0]);
%%5
for J=2:NT
    V= A*V;
    alpha= V(1);
    beta= V(2);
    X1(J)= L1*sin(alpha);
    Y1(J)= -L1*cos(alpha);
    X2(J)= X1(J)+L2*sin(beta);
    Y2(J)= Y1(J)-L2*cos(beta);
end
%%6
X=[X1,Y1];
Y=[X2,Y2];
plot(X1,Y1,'r',X2,Y2,'b')
grid on;
legend('X','Y');
%%opcional
for i=2:NT
    M(i)=getframe;
end
movie(M)

but it gives me this error:

Error using movie
Movie contains uninitialized frames

how can I fix this?

Please some help, thanks.

Answer 1

[Walter Roberson]

Where do you assign to M(1) ? You have

for i=2:NT
    M(i)=getframe;
end

which starts creating M from M(2)

Note: it would be more efficient to initialize M(NT) to something first so that it would not be necessary to keep increasing the size of M as you ran the loop.

Also note that you are not giving any time for the frames to change, so you are going to be copying the same frame into the movie each time.

[Dominique]

Ah! Ah! I made the same mistake.

[Matthew Jenkins]

I did as well, thanks!