>> A=sparse(3,1);
>> whos A
Name Size Bytes Class Attributes
A 3x1 20 double sparse
>> A(1,1)=2;
>> A(2,1)=2;
>> A(3,1)=2;
>> whos A
Name Size Bytes Class Attributes
A 3x1 44 double sparse
再来比较一下非sparse:
>> B=2*ones(3,1);
>> whos B
Name Size Bytes Class Attributes
B 3x1 24 double