Matlab - Arrays

zero

B = zeros(n) returns an n-by-n matrix of zeros. An error message appears if n is not a scalar.
B = zeros(m,n) or B= zeros([m n]) returns an m-by-n matrix of zeros.
B = zeros(m,n,p,...) or B= zeros([m n p ...]) returns an m-by-n-by-p-by-... arrayof zeros.
B = zeros(size(A)) returns an array the same size as A consisting of all zeros.

Remarks

The MATLAB language does not have a dimension statement;

MATLAB automatically allocates storage for matrices.

Nevertheless, for large matrices, MATLAB programs may execute faster if the zeros function is used to set aside storage for a matrix whose elements are to be generated one at a time,
or a row or column at a time.

For example

x = zeros(1,n);
for i = 1:n, x(i) = i; end