Running examples in docs fails

[yuvalwas]

I ran the code from docs homepage:

xs = 1:0.2:5
A = log.(xs)
interp_linear = extrapolate(scale(interpolate(A, BSpline(Linear())), xs)) # errors
itp = interpolate(A, BSpline(Linear())) # errors

As a side note, this made me wonder, because the following example does not fail:

scaled_itp = scale(interpolate(A, BSpline(Linear())), xs)

Although the first argument to scale is exactly itp from above which fails. Just for general knowledge, how is it possible that when I evaluate an expression it errors but when this expression is fed into another function it does not? Thanks

[mkitti]

You're right, extrapolate is missing a second argument.

It should be

interp_linear = extrapolate(scale(interpolate(A, BSpline(Linear())), xs), Throw())

[yuvalwas]

Notice that the linked PR only addresses the first of the two errors.

[mkitti]

That line seems to work for me. What error do you encounter?

julia> itp = interpolate(A, BSpline(Linear()))
21-element interpolate(::Vector{Float64}, BSpline(Linear())) with element type Float64:
 0.0
 0.1823215567939546
 0.3364722366212129
 0.47000362924573563
 0.5877866649021191
 0.6931471805599453
 0.7884573603642703
 0.8754687373538999
 0.9555114450274363
 1.0296194171811581
 1.0986122886681098
 1.1631508098056809
 1.2237754316221157
 1.2809338454620642
 1.33500106673234
 1.3862943611198906
 1.4350845252893227
 1.4816045409242156
 1.5260563034950492
 1.5686159179138452
 1.6094379124341003

Did you not do using Interpolations before hand?

[yuvalwas]

For me, running

using Interpolations
xs = 1:0.2:5
A = log.(xs)
itp = interpolate(A, BSpline(Linear()))

returns

21-element interpolate(::Vector{Float64}, BSpline(Linear())) with element type Float64:
Error showing value of type Interpolations.BSplineInterpolation{Float64, 1, Vector{Float64}, BSpline{Linear{Throw{OnGrid}}}, Tuple{Base.OneTo{Int64}}}:
ERROR: BoundsError: attempt to access Tuple{} at index [1]
Stacktrace:
  [1] getindex(t::Tuple, i::Int64)
    @ Base .\tuple.jl:31
  [2] _checklubounds(tf::Bool, ls::Tuple{}, us::Tuple{}, xs::Tuple{Int64})
    @ Interpolations C:\Users\yuvalw.WISMAIN\.julia\packages\Interpolations\nDwIa\src\Interpolations.jl:420
  [3] _checklubounds(tf::Bool, ls::Tuple{Int64}, us::Tuple{Int64}, xs::Tuple{Int64, Int64})
    @ Interpolations C:\Users\yuvalw.WISMAIN\.julia\packages\Interpolations\nDwIa\src\Interpolations.jl:420
  [4] checklubounds(ls::Tuple{Int64}, us::Tuple{Int64}, xs::Tuple{Int64, Int64})
    @ Interpolations C:\Users\yuvalw.WISMAIN\.julia\packages\Interpolations\nDwIa\src\Interpolations.jl:419
  [5] _checkbounds(::Interpolations.NeedsCheck, itp::Interpolations.BSplineInterpolation{Float64, 1, Vector{Float64}, BSpline{Linear{Throw{OnGrid}}}, Tuple{Base.OneTo{Int64}}}, x::Tuple{Int64, Int64})
    @ Interpolations C:\Users\yuvalw.WISMAIN\.julia\packages\Interpolations\nDwIa\src\Interpolations.jl:417
  [6] checkbounds
    @ Interpolations C:\Users\yuvalw.WISMAIN\.julia\packages\Interpolations\nDwIa\src\Interpolations.jl:407 [inlined]
  [7] isassigned(::Interpolations.BSplineInterpolation{Float64, 1, Vector{Float64}, BSpline{Linear{Throw{OnGrid}}}, Tuple{Base.OneTo{Int64}}}, ::Int64, ::Int64)
    @ Base .\multidimensional.jl:1569
  [8] alignment(io::IOContext{Base.TTY}, X::AbstractVecOrMat, rows::Vector{Int64}, cols::Vector{Int64}, cols_if_complete::Int64, cols_otherwise::Int64, sep::Int64, ncols::Int64)
    @ Base .\arrayshow.jl:68
  [9] _print_matrix(io::IOContext{Base.TTY}, X::AbstractVecOrMat, pre::String, sep::String, post::String, hdots::String, vdots::String, ddots::String, hmod::Int64, vmod::Int64, rowsA::UnitRange{Int64}, colsA::UnitRange{Int64})   
    @ Base .\arrayshow.jl:207
 [10] print_matrix(io::IOContext{…}, X::Interpolations.BSplineInterpolation{…}, pre::String, sep::String, post::String, hdots::String, vdots::String, ddots::String, hmod::Int64, vmod::Int64)
    @ Base .\arrayshow.jl:171
 [11] print_matrix(io::IO, X::AbstractVecOrMat, pre::AbstractString, sep::AbstractString, post::AbstractString, hdots::AbstractString, vdots::AbstractString, ddots::AbstractString, hmod::Integer, vmod::Integer)
    @ Base .\arrayshow.jl:171 [inlined]
 [12] print_array
    @ .\arrayshow.jl:358 [inlined]
 [13] show(io::IOContext{Base.TTY}, ::MIME{Symbol("text/plain")}, X::Interpolations.BSplineInterpolation{Float64, 1, Vector{Float64}, BSpline{Linear{Throw{OnGrid}}}, Tuple{Base.OneTo{Int64}}})
    @ Base .\arrayshow.jl:399
 [14] (::REPL.var"#55#56"{REPL.REPLDisplay{REPL.LineEditREPL}, MIME{Symbol("text/plain")}, Base.RefValue{Any}})(io::Any)
    @ REPL C:\Users\yuvalw.WISMAIN\AppData\Local\Programs\Julia-1.10.0\share\julia\stdlib\v1.10\REPL\src\REPL.jl:273
 [15] with_repl_linfo(f::Any, repl::REPL.LineEditREPL)
    @ REPL C:\Users\yuvalw.WISMAIN\AppData\Local\Programs\Julia-1.10.0\share\julia\stdlib\v1.10\REPL\src\REPL.jl:569
 [16] display(d::REPL.REPLDisplay, mime::MIME{Symbol("text/plain")}, x::Any)
    @ REPL C:\Users\yuvalw.WISMAIN\AppData\Local\Programs\Julia-1.10.0\share\julia\stdlib\v1.10\REPL\src\REPL.jl:259
 [17] display(d::REPL.REPLDisplay, x::Any)
    @ REPL C:\Users\yuvalw.WISMAIN\AppData\Local\Programs\Julia-1.10.0\share\julia\stdlib\v1.10\REPL\src\REPL.jl:278
 [18] display(x::Any)
    @ Base.Multimedia .\multimedia.jl:340
 [19] #invokelatest#2
    @ .\essentials.jl:887 [inlined]
 [20] invokelatest
    @ .\essentials.jl:884 [inlined]
 [21] print_response(errio::IO, response::Any, show_value::Bool, have_color::Bool, specialdisplay::Union{Nothing, AbstractDisplay})
    @ REPL C:\Users\yuvalw.WISMAIN\AppData\Local\Programs\Julia-1.10.0\share\julia\stdlib\v1.10\REPL\src\REPL.jl:315
 [22] (::REPL.var"#57#58"{REPL.LineEditREPL, Pair{Any, Bool}, Bool, Bool})(io::Any)
    @ REPL C:\Users\yuvalw.WISMAIN\AppData\Local\Programs\Julia-1.10.0\share\julia\stdlib\v1.10\REPL\src\REPL.jl:284
 [23] with_repl_linfo(f::Any, repl::REPL.LineEditREPL)
    @ REPL C:\Users\yuvalw.WISMAIN\AppData\Local\Programs\Julia-1.10.0\share\julia\stdlib\v1.10\REPL\src\REPL.jl:569
 [24] print_response(repl::REPL.AbstractREPL, response::Any, show_value::Bool, have_color::Bool)
    @ REPL C:\Users\yuvalw.WISMAIN\AppData\Local\Programs\Julia-1.10.0\share\julia\stdlib\v1.10\REPL\src\REPL.jl:282
 [25] (::REPL.var"#do_respond#80"{Bool, Bool, REPL.var"#93#103"{REPL.LineEditREPL, REPL.REPLHistoryProvider}, REPL.LineEditREPL, REPL.LineEdit.Prompt})(s::REPL.LineEdit.MIState, buf::Any, ok::Bool)
    @ REPL C:\Users\yuvalw.WISMAIN\AppData\Local\Programs\Julia-1.10.0\share\julia\stdlib\v1.10\REPL\src\REPL.jl:911
 [26] (::VSCodeServer.var"#101#104"{REPL.var"#do_respond#80"{Bool, Bool, REPL.var"#93#103"{REPL.LineEditREPL, REPL.REPLHistoryProvider}, REPL.LineEditREPL, REPL.LineEdit.Prompt}})(mi::REPL.LineEdit.MIState, buf::IOBuffer, ok::Bool)
    @ VSCodeServer c:\Users\yuvalw.WISMAIN\.vscode\extensions\julialang.language-julia-1.66.2\scripts\packages\VSCodeServer\src\repl.jl:122
 [27] #invokelatest#2
    @ Base .\essentials.jl:887 [inlined]
 [28] invokelatest
    @ Base .\essentials.jl:884 [inlined]
 [29] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
    @ REPL.LineEdit C:\Users\yuvalw.WISMAIN\AppData\Local\Programs\Julia-1.10.0\share\julia\stdlib\v1.10\REPL\src\LineEdit.jl:2656
 [30] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
    @ REPL C:\Users\yuvalw.WISMAIN\AppData\Local\Programs\Julia-1.10.0\share\julia\stdlib\v1.10\REPL\src\REPL.jl:1312
 [31] (::REPL.var"#62#68"{REPL.LineEditREPL, REPL.REPLBackendRef})()
    @ REPL C:\Users\yuvalw.WISMAIN\AppData\Local\Programs\Julia-1.10.0\share\julia\stdlib\v1.10\REPL\src\REPL.jl:386
Some type information was truncated. Use `show(err)` to see complete types.

I'm running Interpolations v0.14.7 on Julia 1.10.0. I now see that this is not the newest version of Interpolations, but apparently I can't upgrade due to some compatibility constraint. Also I see now that running

itp = interpolate(A, BSpline(Linear()));

runs just fine, so indeed the problem is only with the displaying