B = zeros(n)
B = zeros(m,n)
B = zeros([m n])
B = zeros(m,n,p,...)
B = zeros([m n p ...])
where m,n,p,... express the size for the 1st,2nd,3rd,...nth dimension.
If you're not looking for preallocation then your answer is too generic.
Something else I can think of is a generation of a random matrix, see rand and related functions.
EDIT
obj=VideoReader(video);
% (start)
%akhir deklarasi gambar yang ada di axes
numFrames = obj.NumberOfFrames;
waktu = obj.Duration;
iterasi = numFrames/waktu;
vidHeight = obj.Height;
vidWidth = obj.Width;
disp(numFrames);
a = length(numFrames);
frames = zeros(vidHeight,vidWidth,iterasi);
c = 0;
if(~isempty(get(handles.nmvideo,'String')))
try
for n = 1:iterasi:numFrames
c = c+1;
frames(:,:,c) = read(obj,n);
h = axes(handles.axes1);
imshow(frames(:,:,c));
end
catch
msgbox('Codec AVI tidak didukung atau Corupted file AVI','Error','error');
return
end
else
msgbox('Anda harus memilih video terlebih dahulu','Error','error');
end
