Improve performance issues with Vector Implementations
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Key: MAHOUT-300
URL: https://issues.apache.org/jira/browse/MAHOUT-300
Project: Mahout
Issue Type: Improvement
Affects Versions: 0.3
Reporter: Robin Anil
Fix For: 0.3
AbstractVector operations like times
public Vector times(double x) {
Vector result = clone();
Iterator<Element> iter = iterateNonZero();
while (iter.hasNext()) {
Element element = iter.next();
int index = element.index();
result.setQuick(index, element.get() * x);
}
return result;
}
should be implemented as follows
public Vector times(double x) {
Vector result = clone();
Iterator<Element> iter = result.iterateNonZero();
while (iter.hasNext()) {
Element element = iter.next();
element.set(element.get() * x);
}
return result;
}
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