Custom Indices in OffsetArrays

[Tamas_Papp]

@OvidiusCicero

Is it possible to declare an array whose indices leave out every second index, eg such that the set of indices is 0,2,4,6 ?

No, this violates the current interface, ie that axes returns a Tuple of AbstractUnitRange objects, which have a step of 1. See this discussion:

Custom index arithmetic

This is a clarifying question about custom indexing. If x::AbstractVector has a conforming interface, can I assume that that the valid indexes are firstindex(x):lastindex(x), ie they are integers (so nothing wacky like Float64s or Symbol), forming a contiguous range, so I can do arithmetic on them, at least index += some_step. This is for an algorithm that I find difficult to express in an iterator form using eachindex. Sorry if this is obvious and already clearly discussed in the manual.