Github user feynmanliang commented on the pull request:
https://github.com/apache/spark/pull/7357#issuecomment-134415017
Perhaps we should consider following [Breeze's
API](http://www.scalanlp.org/api/breeze/index.html#breeze.linalg.DenseVector)
here and provide:
* `mapPairs` / `mapValues` : the former includes the indices as arguments
(i.e. `f : (Int, Double) => Double`) while the latter is what you have now
* `mapActive{Pairs,Values}` / `map{Pairs,Values}` : the former only
iterates over active elements (what you have now) while the latter iterates
over all elements
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