Mercurial > repos > public > sbplib_julia
annotate src/Grids/equidistant_grid.jl @ 1686:b996c35dd647 feature/grids/manifolds
Simplify equidistan_grid(::Number,::Number,::Int)
| author | Jonatan Werpers <jonatan@werpers.com> |
|---|---|
| date | Wed, 21 Aug 2024 19:12:28 +0200 |
| parents | 4aa0973bffb0 |
| children | a4c52ae93b11 |
| 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 A one-dimensional equidistant grid. Most users are expected to use |
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5 [`equidistant_grid`](@ref) for constructing equidistant grids. |
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6 |
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7 See also: [`equidistant_grid`](@ref) |
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8 |
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9 |
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10 ## Note |
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11 The type of range used for the points can likely impact performance. |
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12 """ |
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13 struct EquidistantGrid{T,R<:AbstractRange{T}} <: Grid{T,1} |
| 1222 | 14 points::R |
| 15 end | |
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16 |
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17 # Indexing interface |
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18 Base.getindex(g::EquidistantGrid, i) = g.points[i] |
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19 Base.eachindex(g::EquidistantGrid) = eachindex(g.points) |
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20 Base.firstindex(g::EquidistantGrid) = firstindex(g.points) |
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21 Base.lastindex(g::EquidistantGrid) = lastindex(g.points) |
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22 |
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23 Base.axes(g::EquidistantGrid, d) = axes(g.points, d) |
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24 |
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25 # Iteration interface |
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26 Base.iterate(g::EquidistantGrid) = iterate(g.points) |
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27 Base.iterate(g::EquidistantGrid, state) = iterate(g.points, state) |
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28 |
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29 Base.IteratorSize(::Type{<:EquidistantGrid}) = Base.HasShape{1}() |
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30 Base.length(g::EquidistantGrid) = length(g.points) |
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31 Base.size(g::EquidistantGrid) = size(g.points) |
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32 Base.size(g::EquidistantGrid, d) = size(g.points)[d] |
| 1222 | 33 |
| 34 | |
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35 """ |
| 1222 | 36 spacing(grid::EquidistantGrid) |
| 37 | |
| 38 The spacing between grid points. | |
| 39 """ | |
| 40 spacing(g::EquidistantGrid) = step(g.points) | |
| 41 | |
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42 |
| 1222 | 43 """ |
| 44 inverse_spacing(grid::EquidistantGrid) | |
| 45 | |
| 46 The reciprocal of the spacing between grid points. | |
| 47 """ | |
| 48 inverse_spacing(g::EquidistantGrid) = 1/step(g.points) | |
| 49 | |
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50 min_spacing(g::EquidistantGrid) = spacing(g) |
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51 |
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52 |
| 1222 | 53 boundary_identifiers(::EquidistantGrid) = (Lower(), Upper()) |
| 54 boundary_grid(g::EquidistantGrid, id::Lower) = ZeroDimGrid(g[begin]) | |
| 55 boundary_grid(g::EquidistantGrid, id::Upper) = ZeroDimGrid(g[end]) | |
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56 boundary_indices(g::EquidistantGrid, id::Lower) = (1,) |
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57 boundary_indices(g::EquidistantGrid, id::Upper) = (length(g),) |
| 1222 | 58 |
| 59 """ | |
| 60 refine(g::EquidistantGrid, r::Int) | |
| 61 | |
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62 The grid where `g` is refined by the factor `r`. The factor is applied to the number of |
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63 intervals, i.e., 1 less than the size of `g`. |
| 1222 | 64 |
| 65 See also: [`coarsen`](@ref) | |
| 66 """ | |
| 67 function refine(g::EquidistantGrid, r::Int) | |
| 68 new_sz = (length(g) - 1)*r + 1 | |
| 69 return EquidistantGrid(change_length(g.points, new_sz)) | |
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70 end |
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71 |
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72 """ |
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73 coarsen(g::EquidistantGrid, r::Int) |
| 1222 | 74 |
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75 The grid where `g` is coarsened by the factor `r`. The factor is applied to the number of |
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76 intervals, i.e., 1 less than the size of `g`. If the number of |
| 1222 | 77 intervals are not divisible by `r` an error is raised. |
| 78 | |
| 79 See also: [`refine`](@ref) | |
| 80 """ | |
| 81 function coarsen(g::EquidistantGrid, r::Int) | |
| 82 if (length(g)-1)%r != 0 | |
| 83 throw(DomainError(r, "Size minus 1 must be divisible by the ratio.")) | |
| 84 end | |
| 85 | |
| 86 new_sz = (length(g) - 1)÷r + 1 | |
| 87 | |
| 1249 | 88 return EquidistantGrid(change_length(g.points, new_sz)) |
| 1222 | 89 end |
| 90 | |
| 91 | |
| 92 """ | |
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93 equidistant_grid(limit_lower, limit_upper, dims...) |
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94 |
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95 Construct an equidistant grid with corners at the coordinates `limit_lower` and |
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96 `limit_upper`. |
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97 |
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98 The length of the domain sides are given by the components of |
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99 `limit_upper-limit_lower`. E.g for a 2D grid with `limit_lower=(-1,0)` and |
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100 `limit_upper=(1,2)` the domain is defined as `(-1,1)x(0,2)`. The side lengths |
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101 of the grid are not allowed to be negative. |
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102 |
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103 The number of equispaced points in each coordinate direction are given |
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104 by the tuple `dims`. |
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105 |
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106 Note: If `limit_lower` and `limit_upper` are integers and `dims` would allow a |
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107 completely integer grid, `equidistant_grid` will still return a floating point |
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108 grid. This simplifies the implementation and avoids certain surprise |
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109 behaviors. |
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110 """ |
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111 function equidistant_grid(limit_lower, limit_upper, dims::Vararg{Int}) |
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112 if !(length(limit_lower) == length(limit_upper) == length(dims)) |
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113 throw(ArgumentError("All arguments must be of the same length")) |
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114 end |
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115 gs = map(equidistant_grid, limit_lower, limit_upper, dims) |
| 1222 | 116 return TensorGrid(gs...) |
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117 end |
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118 |
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119 """ |
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120 equidistant_grid(limit_lower::Number, limit_upper::Number, size::Int) |
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121 |
| 1222 | 122 Constructs a 1D equidistant grid. |
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123 """ |
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124 function equidistant_grid(limit_lower::Number, limit_upper::Number, size::Int) |
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125 if size <= 0 |
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126 throw(DomainError("size must be postive")) |
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127 end |
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128 |
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129 if limit_upper-limit_lower <= 0 |
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130 throw(DomainError("side length must be postive")) |
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131 end |
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132 |
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133 return EquidistantGrid(range(limit_lower, limit_upper, length=size)) # TBD: Should it use LinRange instead? |
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134 end |
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135 |
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136 |
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137 equidistant_grid(hb::HyperBox, dims::Vararg{Int}) = equidistant_grid(hb.a, hb.b, dims...) |
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138 # TODO: One dimensional grids shouldn't have vector eltype right?, Change here or in HyperBox? |
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139 |
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140 function equidistant_grid(c::Chart, dims::Vararg{Int}) |
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141 lg = equidistant_grid(parameterspace(c), dims...) |
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142 return MappedGrid( |
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143 lg, |
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144 map(c,lg), |
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145 map(ξ->jacobian(c, ξ), lg), |
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146 ) |
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147 end |
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148 |
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149 |
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150 CartesianBoundary{D,BID} = TensorGridBoundary{D,BID} # TBD: What should we do about the naming of this boundary? |
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151 |
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152 |
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153 """ |
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154 change_length(r::AbstractRange, n) |
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155 |
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156 Change the length of `r` to `n`, keeping the same start and stop. |
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157 """ |
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158 function change_length end |
| 908 | 159 |
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160 change_length(r::UnitRange, n) = StepRange{Int,Int}(range(r[begin], r[end], n)) |
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161 change_length(r::StepRange, n) = StepRange{Int,Int}(range(r[begin], r[end], n)) |
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162 change_length(r::StepRangeLen, n) = range(r[begin], r[end], n) |
| 1222 | 163 change_length(r::LinRange, n) = LinRange(r[begin], r[end], n) |