[MAHOUT-300] Solve performance issues with Vector Implementations

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.3
• Fix Version/s: 0.3
• Assignee: Robin Anil
• Reporter: Robin Anil
• Created: 19/Feb/10 20:46
• Updated: 21/May/11 03:24
• Resolved: 22/Feb/10 22:27

Description

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;
}