What mean ''All zero sparse''

Hello, I would like to obtain a row vector concerning a line in a matrix Ai :

for j = 1 : num_nodes_i 
          rowj = Ai(j, :); 
end

When I tried to open rowj in my workspace I only can read :

val = All zero sparse: 1×84

What does this result mean? The rowj vector contains only zero values?

Answer 1

[dpb]

Yes; pretty easy to just check and see...

>> A(3,3)=1;
>> S=sparse(A)
S =
 (3,3)        1
>> S(1,:)
ans =
 All zero sparse: 1×3
>> S(3,:)
ans =
 (1,3)        1
>>