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eltype 自己理解就是 每个元素的类型
julia> 1f0
1.0f0
julia> typeof(1f0)
Float32
julia> fill(1f0, (2,2))
2×2 Array{Float32,2}:
1.0 1.0
1.0 1.0
julia> eltype(fill(1f0, (2,2)))
Float32
help?> eltype
search: eltype fieldtype
eltype(type)
Determine the type of the elements generated by iterating a collection of
the given type. For dictionary types, this will be a Pair{KeyType,ValType}.
The definition eltype(x) = eltype(typeof(x)) is provided for convenience so
that instances can be passed instead of types. However the form that accepts
a type argument should be defined for new types.
Examples
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julia> eltype(fill(1f0, (2,2)))
Float32
julia> eltype(fill(0x1, (2,2)))
UInt8