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What mean ''All zero sparse''

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JGUIS
JGUIS 2018-8-22
编辑： dpb 2018-8-22
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?

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回答（1 个）

dpb
dpb 2018-8-22
编辑：dpb 2018-8-22
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
>>

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