Quiz on MatLab – Vectors and Matrices

1st dimension in a matrix refers to-

What is the length of the array [2,5,9]?

Which statement is not correct?

One element of a matrix is indexed by (3,4). How many columns this matrix has?

How many rows 5-by-3-by-9 array have ?

A 5-by-3-by-2 array have 30 elements in total. Suppose, each element value is just equal to its single valued index. What is the value of (3,1,2) indexed element?

Let, 

A = zeros(3,2);

B = [A,A]’;

Now size(B) = ?

Let,
A = zeros(3,2,4);
B = cat(2,A,A);
Now size(B) = ?

Let,
A = zeros(2,3);
B = repmat(A,[1,2]);
Now size(B) = ?

Let,
A = zeros(2,3,6);
B = permute(A,[3,2,1]);
Which statement should give error?

Let,
A = zeros(2,3,6);
B = shiftdim(sum(A));
C = shiftdim(sum(A,2));
What is size(B) and size(C)?

Let,
A = zeros(2,3);
B = zeros(2,3);
Which statement will execute correctly?