Mercurial > repos > public > sbplib_julia
annotate src/Grids/equidistant_grid.jl @ 1282:11b08b242e48 refactor/grids
Make equdistant_grid return an EquidistantGrid for the 1d Case
| author | Jonatan Werpers <jonatan@werpers.com> |
|---|---|
| date | Mon, 27 Feb 2023 15:39:13 +0100 |
| parents | 17d435c08773 |
| children | ed3ea0630825 |
| rev | line source |
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1 """ |
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2 # TODO: |
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3 """ |
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4 #TODO: Document recomendations for type of range. (LinRange is faster?) |
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5 struct EquidistantGrid{T,R<:AbstractRange{T}} <: Grid{T,1} |
| 1222 | 6 points::R |
| 7 end | |
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8 |
| 1222 | 9 Base.eachindex(g::EquidistantGrid) = eachindex(g.points) |
| 10 | |
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11 # Indexing interface |
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12 Base.getindex(g::EquidistantGrid, i) = g.points[i] |
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13 Base.firstindex(g::EquidistantGrid) = firstindex(g.points) |
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14 Base.lastindex(g::EquidistantGrid) = lastindex(g.points) |
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15 |
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16 # Iteration interface |
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17 Base.iterate(g::EquidistantGrid) = iterate(g.points) |
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18 Base.iterate(g::EquidistantGrid, state) = iterate(g.points, state) |
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19 |
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20 Base.IteratorSize(::Type{<:EquidistantGrid}) = Base.HasShape{1}() |
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21 Base.length(g::EquidistantGrid) = length(g.points) |
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22 Base.size(g::EquidistantGrid) = size(g.points) |
| 1222 | 23 |
| 24 | |
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25 """ |
| 1222 | 26 spacing(grid::EquidistantGrid) |
| 27 | |
| 28 The spacing between grid points. | |
| 29 """ | |
| 30 spacing(g::EquidistantGrid) = step(g.points) | |
| 31 | |
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32 |
| 1222 | 33 """ |
| 34 inverse_spacing(grid::EquidistantGrid) | |
| 35 | |
| 36 The reciprocal of the spacing between grid points. | |
| 37 """ | |
| 38 inverse_spacing(g::EquidistantGrid) = 1/step(g.points) | |
| 39 | |
| 40 | |
| 41 boundary_identifiers(::EquidistantGrid) = (Lower(), Upper()) | |
| 42 boundary_grid(g::EquidistantGrid, id::Lower) = ZeroDimGrid(g[begin]) | |
| 43 boundary_grid(g::EquidistantGrid, id::Upper) = ZeroDimGrid(g[end]) | |
| 44 | |
| 45 | |
| 46 """ | |
| 47 refine(g::EquidistantGrid, r::Int) | |
| 48 | |
| 49 Refines `grid` by a factor `r`. The factor is applied to the number of | |
| 50 intervals which is 1 less than the size of the grid. | |
| 51 | |
| 52 See also: [`coarsen`](@ref) | |
| 53 """ | |
| 54 function refine(g::EquidistantGrid, r::Int) | |
| 55 new_sz = (length(g) - 1)*r + 1 | |
| 56 return EquidistantGrid(change_length(g.points, new_sz)) | |
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57 end |
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58 |
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59 """ |
| 1222 | 60 coarsen(grid::EquidistantGrid, r::Int) |
| 61 | |
| 62 Coarsens `grid` by a factor `r`. The factor is applied to the number of | |
| 63 intervals which is 1 less than the size of the grid. If the number of | |
| 64 intervals are not divisible by `r` an error is raised. | |
| 65 | |
| 66 See also: [`refine`](@ref) | |
| 67 """ | |
| 68 function coarsen(g::EquidistantGrid, r::Int) | |
| 69 if (length(g)-1)%r != 0 | |
| 70 throw(DomainError(r, "Size minus 1 must be divisible by the ratio.")) | |
| 71 end | |
| 72 | |
| 73 new_sz = (length(g) - 1)÷r + 1 | |
| 74 | |
| 1249 | 75 return EquidistantGrid(change_length(g.points, new_sz)) |
| 1222 | 76 end |
| 77 | |
| 78 | |
| 79 """ | |
| 80 equidistant_grid(size::Dims, limit_lower, limit_upper) | |
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81 |
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82 Construct an equidistant grid with corners at the coordinates `limit_lower` and |
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83 `limit_upper`. |
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84 |
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85 The length of the domain sides are given by the components of |
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86 `limit_upper-limit_lower`. E.g for a 2D grid with `limit_lower=(-1,0)` and |
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87 `limit_upper=(1,2)` the domain is defined as `(-1,1)x(0,2)`. The side lengths |
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88 of the grid are not allowed to be negative. |
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89 |
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90 The number of equidistantly spaced points in each coordinate direction are given |
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91 by the tuple `size`. |
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92 |
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93 Note: If `limit_lower` and `limit_upper` are integers and `size` would allow a |
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94 completely integer grid, `equidistant_grid` will still return a floating point |
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95 grid. This simlifies the implementation and avoids certain surprise |
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96 behaviours. |
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97 """ |
| 1222 | 98 function equidistant_grid(size::Dims, limit_lower, limit_upper) |
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99 gs = map(equidistant_grid, size, limit_lower, limit_upper) |
| 1222 | 100 return TensorGrid(gs...) |
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101 end |
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102 |
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103 """ |
| 1222 | 104 equidistant_grid(size::Int, limit_lower::T, limit_upper::T) |
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105 |
| 1222 | 106 Constructs a 1D equidistant grid. |
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107 """ |
| 1222 | 108 function equidistant_grid(size::Int, limit_lower::T, limit_upper::T) where T |
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109 if any(size .<= 0) |
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110 throw(DomainError("size must be postive")) |
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111 end |
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112 |
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113 if any(limit_upper.-limit_lower .<= 0) |
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114 throw(DomainError("side length must be postive")) |
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115 end |
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116 return EquidistantGrid(range(limit_lower, limit_upper, length=size)) # TBD: Should it use LinRange instead? |
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117 end |
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118 |
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119 CartesianBoundary{D,BID} = TensorGridBoundary{D,BID} # TBD: What should we do about the naming of this boundary? |
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120 |
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121 |
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122 """ |
| 1222 | 123 change_length(::AbstractRange, n) |
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124 |
| 1222 | 125 Change the length of a range to `n`, keeping the same start and stop. |
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126 """ |
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127 function change_length end |
| 908 | 128 |
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129 change_length(r::UnitRange, n) = StepRange{Int,Int}(range(r[begin], r[end], n)) |
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130 change_length(r::StepRange, n) = StepRange{Int,Int}(range(r[begin], r[end], n)) |
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131 change_length(r::StepRangeLen, n) = range(r[begin], r[end], n) |
| 1222 | 132 change_length(r::LinRange, n) = LinRange(r[begin], r[end], n) |