Move RealVector.sparseIterator() to SparseRealVector
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Key: MATH-626
URL: https://issues.apache.org/jira/browse/MATH-626
Project: Commons Math
Issue Type: Improvement
Affects Versions: 3.0
Reporter: Arne Plöse
Priority: Minor
Having this method available for all is not very efficient, because if I want
use this feature I must check for interface SparseRealVector.
otherwise different implementations could be faster.
I.e. no array clone and the assigning all values again.
Maybe one could add a menthod fillstate() to SparseRealVector to guide which is
faster - use array clone and then sparseIterator or just create the array and
then fill it up.
To reduce confusion a second Interface ArrayRealVector with the method
getDataRef() and removing getData() from RealVector would be nice - there is a
toArray() this should be sufficient.
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