6-20  issparseʹá
⣺Enterȷϡ
>> v=[1 2 5 9 4 1 2 6];
>>  S=diag(v,2)               %ɾS
S =
     0     0     1     0     0     0     0     0     0     0
     0     0     0     2     0     0     0     0     0     0
     0     0     0     0     5     0     0     0     0     0
     0     0     0     0     0     9     0     0     0     0
     0     0     0     0     0     0     4     0     0     0
     0     0     0     0     0     0     0     1     0     0
     0     0     0     0     0     0     0     0     2     0
     0     0     0     0     0     0     0     0     0     6
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
>> R=sparse(S)                 %ϡR
R =
   (1,3)        1
   (2,4)        2
   (3,5)        5
   (4,6)        9
   (5,7)        4
   (6,8)        1
   (7,9)        2
   (8,10)       6
>>  N=issparse(S)
N =
     0                       %֪SΪϡ
>> Y=issparse(R)               %֪RΪϡ
Y =
     1
>>
