Interpolating into a series of matrices

General Usage
2

AFAIK Interpolations.jl should “just work”:

julia> data = [[1 2; 3 4], [5 6; 7 8]]
2-element Array{Array{Int64,2},1}:
 [1 2; 3 4]
 [5 6; 7 8]

julia> itp = interpolate(data, BSpline(Linear()))
2-element interpolate(::Array{Array{Int64,2},1}, BSpline(Linear())) with element type Array{Float64,2}:
 [1 2; 3 4]
 [5 6; 7 8]

julia> itp[1.0]
2×2 Array{Float64,2}:
 1.0  2.0
 3.0  4.0

julia> itp[1.1]
2×2 Array{Float64,2}:
 1.4  2.4
 3.4  4.4
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