fixed bug in CustomMedium.grids, which was giving incorrect grid bo…

…undaries at edges.
flexcompute · Jul 21, 2023 · 170cb35 · 170cb35
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Properly handle sign flip in `ModeMonitor` outputs with `direction="-"` in adjoint plugin.
+- Bug in `CustomMedium.grids`, which was giving incorrect grid boundaries at edges.
 - Out of date endpoint in `migrate` option of webapi.
 
 ## [2.3.1] - 2023-7-14

diff --git a/tidy3d/components/medium.py b/tidy3d/components/medium.py
@@ -1182,7 +1182,7 @@ def make_bound_coords(coords: np.ndarray, pt_min: float, pt_max: float) -> List[
                 """Convert user supplied coords into boundary coords to use in :class:`.Grid`."""
 
                 # get coordinates of the bondaries halfway between user-supplied data
-                coord_bounds = (coords[1:] + coords[:1]) / 2.0
+                coord_bounds = (coords[1:] + coords[:-1]) / 2.0
 
                 # res-set coord boundaries that lie outside geometry bounds to the boundary (0 vol.)
                 coord_bounds[coord_bounds <= pt_min] = pt_min