Can get Gridded() object at vector, why not scaled one?

[floswald]

I can get values at a vector of points from a gridded interp object, but not from a scaled version of that same object. intended, not, or my mistake?

this is related to #128 .

julia> xy = [3z+2y for z in linspace(0.0,1,10),y in 0:0.2:1]
julia> itp = interpolate((1:10,1:6),xy,(Gridded(Linear()),NoInterp()
       ))
10×6 Interpolations.GriddedInterpolation{Float64,2,Float64,Tuple{Interpolations.Gridded{Interpolations.Linear},Interpolations.NoInterp},Tuple{Array{Int64,1},Array{Int64,1}},0}:
 0.0       0.4       0.8      1.2      1.6      2.0    
 0.333333  0.733333  1.13333  1.53333  1.93333  2.33333
 0.666667  1.06667   1.46667  1.86667  2.26667  2.66667
 1.0       1.4       1.8      2.2      2.6      3.0    
 1.33333   1.73333   2.13333  2.53333  2.93333  3.33333
 1.66667   2.06667   2.46667  2.86667  3.26667  3.66667
 2.0       2.4       2.8      3.2      3.6      4.0    
 2.33333   2.73333   3.13333  3.53333  3.93333  4.33333
 2.66667   3.06667   3.46667  3.86667  4.26667  4.66667
 3.0       3.4       3.8      4.2      4.6      5.0    

julia> itp[3.3,1:6]
1×6 Array{Float64,2}:
 0.766667  1.16667  1.56667  1.96667  2.36667  2.76667

julia> sitp =scale( itp ,linspace(0.0,1.0,10),1:6)
10×6 Interpolations.ScaledInterpolation{Float64,2,Interpolations.GriddedInterpolation{Float64,2,Float64,Tuple{Interpolations.Gridded{Interpolations.Linear},Interpolations.NoInterp},Tuple{Array{Int64,1},Array{Int64,1}},0},Tuple{Interpolations.Gridded{Interpolations.Linear},Interpolations.NoInterp},Interpolations.OnGrid,Tuple{LinSpace{Float64},UnitRange{Int64}}}:
  3.0   3.4   3.8   4.2   4.6   5.0
  6.0   6.4   6.8   7.2   7.6   8.0
  9.0   9.4   9.8  10.2  10.6  11.0
 12.0  12.4  12.8  13.2  13.6  14.0
 15.0  15.4  15.8  16.2  16.6  17.0
 18.0  18.4  18.8  19.2  19.6  20.0
 21.0  21.4  21.8  22.2  22.6  23.0
 24.0  24.4  24.8  25.2  25.6  26.0
 27.0  27.4  27.8  28.2  28.6  29.0
 30.0  30.4  30.8  31.2  31.6  32.0

julia> sitp[0.3,1:6]
ERROR: BoundsError: attempt to access 10×6 Interpolations.ScaledInterpolation{Float64,2,Interpolations.GriddedInterpolation{Float64,2,Float64,Tuple{Interpolations.Gridded{Interpolations.Linear},Interpolations.NoInterp},Tuple{Array{Int64,1},Array{Int64,1}},0},Tuple{Interpolations.Gridded{Interpolations.Linear},Interpolations.NoInterp},Interpolations.OnGrid,Tuple{LinSpace{Float64},UnitRange{Int64}}} at index [0.3,1:6]
 in throw_boundserror(::Interpolations.ScaledInterpolation{Float64,2,Interpolations.GriddedInterpolation{Float64,2,Float64,Tuple{Interpolations.Gridded{Interpolations.Linear},Interpolations.NoInterp},Tuple{Array{Int64,1},Array{Int64,1}},0},Tuple{Interpolations.Gridded{Interpolations.Linear},Interpolations.NoInterp},Interpolations.OnGrid,Tuple{LinSpace{Float64},UnitRange{Int64}}}, ::Tuple{Float64,UnitRange{Int64}}) at ./abstractarray.jl:355
 in checkbounds at ./abstractarray.jl:284 [inlined]
 in _getindex at ./multidimensional.jl:270 [inlined]
 in getindex(::Interpolations.ScaledInterpolation{Float64,2,Interpolations.GriddedInterpolation{Float64,2,Float64,Tuple{Interpolations.Gridded{Interpolations.Linear},Interpolations.NoInterp},Tuple{Array{Int64,1},Array{Int64,1}},0},Tuple{Interpolations.Gridded{Interpolations.Linear},Interpolations.NoInterp},Interpolations.OnGrid,Tuple{LinSpace{Float64},UnitRange{Int64}}}, ::Float64, ::UnitRange{Int64}) at ./abstractarray.jl:752