Mercurial > repos > public > sbplib_julia
annotate src/Grids/equidistant_grid.jl @ 1331:ed3ea0630825 refactor/grids
Add some docs for Grid
| author | Jonatan Werpers <jonatan@werpers.com> |
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| date | Wed, 03 May 2023 15:29:44 +0200 |
| parents | 11b08b242e48 |
| children | cca45af5e724 |
| rev | line source |
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1 """ |
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2 EquidistantGrid{T,R<:AbstractRange{T}} <: Grid{T,1} |
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3 |
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4 TODO |
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5 """ |
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6 #TODO: Document recomendations for type of range. (LinRange is faster?) |
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7 struct EquidistantGrid{T,R<:AbstractRange{T}} <: Grid{T,1} |
| 1222 | 8 points::R |
| 9 end | |
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10 |
| 1222 | 11 Base.eachindex(g::EquidistantGrid) = eachindex(g.points) |
| 12 | |
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13 # Indexing interface |
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14 Base.getindex(g::EquidistantGrid, i) = g.points[i] |
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15 Base.firstindex(g::EquidistantGrid) = firstindex(g.points) |
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16 Base.lastindex(g::EquidistantGrid) = lastindex(g.points) |
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17 |
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18 # Iteration interface |
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19 Base.iterate(g::EquidistantGrid) = iterate(g.points) |
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20 Base.iterate(g::EquidistantGrid, state) = iterate(g.points, state) |
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21 |
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22 Base.IteratorSize(::Type{<:EquidistantGrid}) = Base.HasShape{1}() |
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23 Base.length(g::EquidistantGrid) = length(g.points) |
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24 Base.size(g::EquidistantGrid) = size(g.points) |
| 1222 | 25 |
| 26 | |
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27 """ |
| 1222 | 28 spacing(grid::EquidistantGrid) |
| 29 | |
| 30 The spacing between grid points. | |
| 31 """ | |
| 32 spacing(g::EquidistantGrid) = step(g.points) | |
| 33 | |
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34 |
| 1222 | 35 """ |
| 36 inverse_spacing(grid::EquidistantGrid) | |
| 37 | |
| 38 The reciprocal of the spacing between grid points. | |
| 39 """ | |
| 40 inverse_spacing(g::EquidistantGrid) = 1/step(g.points) | |
| 41 | |
| 42 | |
| 43 boundary_identifiers(::EquidistantGrid) = (Lower(), Upper()) | |
| 44 boundary_grid(g::EquidistantGrid, id::Lower) = ZeroDimGrid(g[begin]) | |
| 45 boundary_grid(g::EquidistantGrid, id::Upper) = ZeroDimGrid(g[end]) | |
| 46 | |
| 47 | |
| 48 """ | |
| 49 refine(g::EquidistantGrid, r::Int) | |
| 50 | |
| 51 Refines `grid` by a factor `r`. The factor is applied to the number of | |
| 52 intervals which is 1 less than the size of the grid. | |
| 53 | |
| 54 See also: [`coarsen`](@ref) | |
| 55 """ | |
| 56 function refine(g::EquidistantGrid, r::Int) | |
| 57 new_sz = (length(g) - 1)*r + 1 | |
| 58 return EquidistantGrid(change_length(g.points, new_sz)) | |
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59 end |
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60 |
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61 """ |
| 1222 | 62 coarsen(grid::EquidistantGrid, r::Int) |
| 63 | |
| 64 Coarsens `grid` by a factor `r`. The factor is applied to the number of | |
| 65 intervals which is 1 less than the size of the grid. If the number of | |
| 66 intervals are not divisible by `r` an error is raised. | |
| 67 | |
| 68 See also: [`refine`](@ref) | |
| 69 """ | |
| 70 function coarsen(g::EquidistantGrid, r::Int) | |
| 71 if (length(g)-1)%r != 0 | |
| 72 throw(DomainError(r, "Size minus 1 must be divisible by the ratio.")) | |
| 73 end | |
| 74 | |
| 75 new_sz = (length(g) - 1)÷r + 1 | |
| 76 | |
| 1249 | 77 return EquidistantGrid(change_length(g.points, new_sz)) |
| 1222 | 78 end |
| 79 | |
| 80 | |
| 81 """ | |
| 82 equidistant_grid(size::Dims, limit_lower, limit_upper) | |
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83 |
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84 Construct an equidistant grid with corners at the coordinates `limit_lower` and |
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85 `limit_upper`. |
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86 |
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87 The length of the domain sides are given by the components of |
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88 `limit_upper-limit_lower`. E.g for a 2D grid with `limit_lower=(-1,0)` and |
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89 `limit_upper=(1,2)` the domain is defined as `(-1,1)x(0,2)`. The side lengths |
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90 of the grid are not allowed to be negative. |
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91 |
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92 The number of equidistantly spaced points in each coordinate direction are given |
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93 by the tuple `size`. |
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94 |
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95 Note: If `limit_lower` and `limit_upper` are integers and `size` would allow a |
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96 completely integer grid, `equidistant_grid` will still return a floating point |
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97 grid. This simlifies the implementation and avoids certain surprise |
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98 behaviours. |
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99 """ |
| 1222 | 100 function equidistant_grid(size::Dims, limit_lower, limit_upper) |
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101 gs = map(equidistant_grid, size, limit_lower, limit_upper) |
| 1222 | 102 return TensorGrid(gs...) |
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103 end |
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104 |
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105 """ |
| 1222 | 106 equidistant_grid(size::Int, limit_lower::T, limit_upper::T) |
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107 |
| 1222 | 108 Constructs a 1D equidistant grid. |
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109 """ |
| 1222 | 110 function equidistant_grid(size::Int, limit_lower::T, limit_upper::T) where T |
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111 if any(size .<= 0) |
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112 throw(DomainError("size must be postive")) |
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113 end |
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114 |
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115 if any(limit_upper.-limit_lower .<= 0) |
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116 throw(DomainError("side length must be postive")) |
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117 end |
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118 return EquidistantGrid(range(limit_lower, limit_upper, length=size)) # TBD: Should it use LinRange instead? |
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119 end |
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120 |
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121 CartesianBoundary{D,BID} = TensorGridBoundary{D,BID} # TBD: What should we do about the naming of this boundary? |
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122 |
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124 """ |
| 1222 | 125 change_length(::AbstractRange, n) |
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126 |
| 1222 | 127 Change the length of a range to `n`, keeping the same start and stop. |
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128 """ |
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129 function change_length end |
| 908 | 130 |
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131 change_length(r::UnitRange, n) = StepRange{Int,Int}(range(r[begin], r[end], n)) |
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132 change_length(r::StepRange, n) = StepRange{Int,Int}(range(r[begin], r[end], n)) |
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133 change_length(r::StepRangeLen, n) = range(r[begin], r[end], n) |
| 1222 | 134 change_length(r::LinRange, n) = LinRange(r[begin], r[end], n) |