How do I convert the frames I've generated Matlab to avi format

How do I convert the frames/movie in this program to avi format so that I can show it in a power point presentation

y_max=50.0;
y_min=-50.0;
%F= (rand(20,10).*10);
N=300;
RandForce =  1030*rand(N,1) .* sign(randn(N,1));
k= 20.5;
y=RandForce./k;
%r=x_min+(x_max-x_min).*rand(n,1);
y(y_min > y | y > y_max) = 0;

figure(1)
plot(y); % Graphs the Plot
xlabel('frames'); 
ylabel('Random Positions');

figure (2)
scatter( 1:length(y), y, 90, [0 0 0], 'filled' );
xlabel('frames'); 
ylabel('Random Positions');

figure('Position', [300  300 300 300])
axlim=900;
aylim=80;
for i = 1:length(y)
   %fprintf('Frame: %03d\n', i) 
   b=y;
   plot(b,'.','MarkerSize',50)
   axis([-axlim axlim -aylim aylim]);
  % axis off
end

randommov = figure('Position', [300  300 300 300])
h=randommov;
set(h,'Position',[300  300 300 300])
set(h,'NextPlot','replacechildren')%Make sure each frame 
                                   %of the movie is the same size
axlim=900;
aylim=80;
N=10;
count=1;
M=moviein(N);
for j = 1:N
   %fprintf('Frame: %03d\n', i) 
   b=y;
   plot(b(j),'.','MarkerSize',50)
   axis([-axlim axlim -aylim aylim]);
   title('Microsphere');
   S1=sprintf('Frame: %03d\n', j);
   text(6,.5,S1)
   titlestr = sprintf('Frame: %03d', k); % our title will change
   %fprintf('Frame %d\n', k); % print loop counter68. 
   pause(0.1);
  % axis off
   M(:,j) = getframe(randommov);
   M(count)=getframe(h);
   count=count+1;
   %movie(M)
end

Answer 1

[Walter Roberson]

If necessary if you have an older MATLAB, use avifile. However, it is better to use VideoWriter if you have it.