Display of interpolation objects is broken (soon...)

[tomasaschan]

julia> using Interpolations

julia> A1 = rand(3)
3-element Array{Float64,1}:
 0.305873 
 0.0887733
 0.981168 

julia> i1 = Interpolation(A1, Linear(OnGrid()), ExtrapError())
[3]-element Interpolation{Float64,1,Linear{OnGrid},ExtrapError}Error showing value of type Interpolation{Float64,1,Linear{OnGrid},ExtrapError}:
ERROR: type: writemime: in typeassert, expected Int64, got Array{Int64,1}
 in writemime at replutil.jl:19
 in display at REPL.jl:117
 in display at REPL.jl:120
 in display at multimedia.jl:149
 in print_response at REPL.jl:139
 in print_response at REPL.jl:124
 in anonymous at REPL.jl:586
 in run_interface at ./LineEdit.jl:1379
 in run_frontend at ./REPL.jl:818
 in run_repl at ./REPL.jl:169
 in _start at ./client.jl:400

It works on master, but will break as soon as #9 merges. I have no idea what I did to break it. @timholy, any ideas?

[timholy]

I'm not sure which julia version you're using, but for me line 19 of replutil.jl is a call to isempty. You could test that stand-alone and use @which to figure out the chain of calls. One likely possibility is a broken size function, or iteration if you've defined start, next, and done.

[tomasaschan]

I have modified the size function on interpolation objects, similarly to how it's done in Grid - when the coefficient matrix is padded, I return the size of the un-padded matrix. So if breaking size can break this, that's a very probable culprit =)

Is there any documentation/information on what contract size should fulfil to work in these contexts? I'll see if I can hunt this down with @which calls anyhow...

[tomasaschan]

Oh, and for what it's worth:

julia> versioninfo()
Julia Version 0.3.5-pre+2
Commit ddfbc6c (2014-12-26 10:47 UTC)
Platform Info:
  System: Linux (x86_64-linux-gnu)
  CPU: Intel(R) Core(TM) i7-4600U CPU @ 2.10GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Haswell)
  LAPACK: libopenblas
  LIBM: libopenlibm
  LLVM: libLLVM-3.3

[timholy]

Plain size(A) needs to return a tuple; size(A,d) needs to return an Int.

[tomasaschan]

Ah - I was returning a 1-tuple with an array, rather than a tuple with the array contents. The difference between tuple([1,2]) and tuple([1,2]...)...