6-6  ɡ
⣺Enterȷϡ
>> A=zeros(3,5)
A =
     0     0     0     0     0
     0     0     0     0     0
     0     0     0     0     0
>> B=[2 3 4 5 6;9 8 7 6 5;1 2 3 4 5]
B =
     2     3     4     5     6
     9     8     7     6     5
     1     2     3     4     5
>> A=zeros(size(B))
A =
     0     0     0     0     0
     0     0     0     0     0
     0     0     0     0     0
>>  A=zeros(4)
A =
     0     0     0     0
     0     0     0     0
     0     0     0     0
     0     0     0     0
>>  C=ones(3,4)
C =
     1     1     1     1
     1     1     1     1
     1     1     1     1
>> C=ones(4)
C =
     1     1     1     1
     1     1     1     1
     1     1     1     1
     1     1     1     1
>>
