AbstractVector.hashCode() should not care about the order of iteration over
elements
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Key: MAHOUT-207
URL: https://issues.apache.org/jira/browse/MAHOUT-207
Project: Mahout
Issue Type: Improvement
Components: Matrix
Affects Versions: 0.2
Environment: all
Reporter: Jake Mannix
Priority: Minor
Fix For: 0.3
As was discussed in MAHOUT-165, hashCode can be implemented simply like this:
{code}
public int hashCode() {
final int prime = 31;
int result = prime + ((name == null) ? 0 : name.hashCode());
result = prime * result + size();
Iterator<Element> iter = iterateNonZero();
while (iter.hasNext()) {
Element ele = iter.next();
long v = Double.doubleToLongBits(ele.get());
result += (ele.index() * (int)(v^(v>>32)));
}
return result;
}
{code}
which obviates the need to sort the elements in the case of a
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