How to release zero elements in sparse matrix
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Hi,
The Matlab document says sparse matrix does not release elements from memory when they are set to zero. Then how can I release the elements if they are zero?
For example:
>> a=sparse(ones(10,10));
>> nzmax(a)
ans =
100
>> a(1:5,1:5)=0;
>> nzmax(a)
ans =
100
>>
What I want is that nzmax(a) reports 75 since I don't want to waste the memory for 25 zeros. Is there any command I can use?
Thanks in advance!
Edit: Made the description of example clear.
采纳的回答
Azzi Abdelmalek
2013-2-7
Your example is not correct, what you should do is
a=ones(10,10);
nzmax(a)
a(1:5,1:5)=0
a=sparse(a)
nzmax(a)
更多回答（2 个）
Walter Roberson
2013-2-7
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