Re: [eigen] On a flexible API for submatrices, slicing, indexing, masking, etc.

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4: Differentiate between a forward aseq and backward aseq, i.e., 
A(seq(0, n-1))
gives A[0, ..., n-1], and  A(rseq(n-1, 0)) gives A[n-1, ... 0]

Sorry ​I really meant​ 
A(seq(0, n-1))
 gives A[0, ..., n-1], and  A(rseq(0, n-1)) gives A[n-1, ... 0].
Also this does not solve the question of needing last in a seq _expression_, though it solves the conflict between negative stride and half interval.

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