Hello, I would like to revive a discussion which took place a few months ago, about the design of the matrix and vector classes. As far as I remember, what came out was that these classes would benefit from a more functional approach, à la Mahout. Additionally, I think Ted suggested that we introduce Views of a given matrix. I know we should be careful not to be too quick, but I think we should give it a go. During our discussions, it came out that RealVector and RealMatrix had useful embryos of functional features - RealVector.map(UnivariateRealFunction f) - RealMatrix.walkXxx(visitor) these features are somewhat similar, except for the fact that RealVector.map never sees the index of the current cell. A first step might be to unify these two interfaces - Implement visitors for RealVector, - possibly add a map(UnivariateRealFunction f) to Matrix. As a second (big step), we could try and clean up the interfaces for Vectors and Matrices, defining as many Visitors as possible, instead of cluttering the corresponding interfaces (keeping, of course, performance issues in mind).
What do you think? Should we give it a go? At this point, people already suggested that this should be done in a branch? Best regards for now, Sébastien
