6-7  ԽǾɡ
⣺Enterȷϡ
>> v=[1 2 4 5 7];
>> diag(v,2)
ans =
     0     0     1     0     0     0     0
     0     0     0     2     0     0     0
     0     0     0     0     4     0     0
     0     0     0     0     0     5     0
     0     0     0     0     0     0     7
     0     0     0     0     0     0     0
     0     0     0     0     0     0     0
>>  diag(v,-1)
ans =
     0     0     0     0     0     0
     1     0     0     0     0     0
     0     2     0     0     0     0
     0     0     4     0     0     0
     0     0     0     5     0     0
     0     0     0     0     7     0
>> diag(v)
ans =
     1     0     0     0     0
     0     2     0     0     0
     0     0     4     0     0
     0     0     0     5     0
     0     0     0     0     7
>>
