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Frontmatter

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Author 1
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begin
import Pkg
Pkg.activate(mktempdir())
end
❔
  Activating new project at `/tmp/jl_T3cvUz`
116 ms
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begin
Pkg.add("OffsetArrays")
using OffsetArrays
end
❔
    Updating registry at `~/.julia/registries/General.toml`
   Resolving package versions...
    Updating `/tmp/jl_T3cvUz/Project.toml`
  [6fe1bfb0] + OffsetArrays v1.17.0
    Updating `/tmp/jl_T3cvUz/Manifest.toml`
  [79e6a3ab] + Adapt v4.3.0
  [6fe1bfb0] + OffsetArrays v1.17.0
  [ae029012] + Requires v1.3.1
  [56f22d72] + Artifacts
  [8f399da3] + Libdl
  [37e2e46d] + LinearAlgebra
  [9a3f8284] + Random
  [ea8e919c] + SHA
  [9e88b42a] + Serialization
  [cf7118a7] + UUIDs
  [e66e0078] + CompilerSupportLibraries_jll
  [4536629a] + OpenBLAS_jll
  [8e850b90] + libblastrampoline_jll
2.0 s
3×5 reshape(::UnitRange{Int64}, 3, 5) with eltype Int64:
 1  4  7  10  13
 2  5  8  11  14
 3  6  9  12  15
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A = reshape(1:15, 3, 5)
15.8 μs
3×5 OffsetArray(reshape(::UnitRange{Int64}, 3, 5), -1:1, 0:4) with eltype Int64 with indices -1:1×0:4:
 1  4  7  10  13
 2  5  8  11  14
 3  6  9  12  15
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OA = OffsetArray(A, -1:1, 0:4) # OA will have axes (-1:1, 0:4)
44.1 μs
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OffsetArray(rand(100),30)
16.3 μs
B = collect(rand(10))
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17.6 μs

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66.1 μs
OffsetArray(zeros(3), 20:22)
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18.1 μs
OB = OffsetArray(B, 5)
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15.0 μs
[
OB[i] for i in eachindex(OB)
] |> collect
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42.8 ms
enumerate(OB) |> collect
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19.7 ms
p = pairs(IndexLinear(), OB) |> collect
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42.1 ms
[(1,2),(3,[4,5])]
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25.4 ms
NamedTuple
NamedTuple
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9.8 μs
nt = (a=1,b=2)
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17.2 μs
NamedTuple{(:a, :b), Tuple{Int64, Int64}}
nt |> typeof
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83.1 μs
true
t isa Tuple
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14.5 μs
false
nt isa NTuple
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14.1 μs
"a"
sprint(print, :a)
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18.1 μs
t = (1,2,3)
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15.0 μs
zip(eachindex(t), t) |> collect
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90.1 ms
zip(eachindex(nt), nt) |> collect
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74.5 ms
let
a,b = (1,2)
end
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19.8 μs
collect(d)
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12.5 μs
1
2
1 => 2
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12.3 μs
r = Ref((1,2))
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16.1 μs
true
r isa Ref{Tuple{Int,Int}}
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19.4 μs
d=Dict([:a=>1,:b=>2])
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21.8 μs
Tuple(1:1000)
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109 μs
typename(Markdown.MD)
(md"" |> typeof).name
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3.0 ms
"AbstractDict"
sprint(print, nameof(AbstractDict))
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5.5 ms
show(io::IO, x::Type) in Base at show.jl:881
@which Base.show(stdout, p |> typeof)
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101 ms
Error message

BoundsError: attempt to access 10-element OffsetArrays.IdOffsetRange{Int64, Base.OneTo{Int64}} with indices 6:15 at index [1:3]

Stack trace

Here is what happened, the most recent locations are first:

  1. throw_boundserror(A::OffsetArrays.IdOffsetRange{Int64, Base.OneTo{Int64}}, I::Tuple{UnitRange{Int64}})
    from abstractarray.jl:691
  2. checkbounds
    from abstractarray.jl:656
  3. getindex
    from axes.jl:255
  4. from This cell: line 1
    eachindex(OB)[1:3]
uhmmmmmm??!
eachindex(OB)[1:3]
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---
Error message

BoundsError: attempt to access 10-element LinearIndices{1, Tuple{OffsetArrays.IdOffsetRange{Int64, Base.OneTo{Int64}}}} with indices 6:15 at index [1:3]

Stack trace

Here is what happened, the most recent locations are first:

  1. throw_boundserror(A::LinearIndices{1, Tuple{OffsetArrays.IdOffsetRange{Int64, Base.OneTo{Int64}}}}, I::Tuple{UnitRange{Int64}})
    from abstractarray.jl:691
  2. checkbounds
    from abstractarray.jl:656
  3. getindex
    from indices.jl:484
  4. from This cell: line 1
    LinearIndices(OB)[1:3]
Be patient :)
LinearIndices(OB)[1:3]
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---
OB
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8.8 μs
Error message

syntax: incomplete: "begin" at /home/runner/work/disorganised-mess/disorganised-mess/offsetarrays.jl#==#77d2f1b8-ed72-11ea-36c3-8d791b899b19:1 requires end

begin:begin+1
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---
zip(eachindex(OB)[begin:begin+3-1], OB[begin:begin+3-1]) |> collect
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94.5 ms
OB[end-3+1:end]
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3.6 ms