Throw clear ArgumentError for grids too coarse for boundary stencil#578
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Signed-off-by: Sai Asish Y <say.apm35@gmail.com>
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This looks much better. I've closed my PR since this is a cleaner approach. Thanks. |
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Fixes #559. On a non-uniform grid with fewer than approximation_order + 1 points, the boundary extrapolator indexed dx out of range and failed with an opaque BoundsError deep in extrapolation_weights.jl. This adds an explicit length check up front so the user gets a clear message telling them the grid is too coarse for the boundary stencil. Added a regression test alongside the existing non-uniform convection cases.