diff options
Diffstat (limited to 'Python/pywarpx/fields.py')
| -rw-r--r-- | Python/pywarpx/fields.py | 61 |
1 files changed, 31 insertions, 30 deletions
diff --git a/Python/pywarpx/fields.py b/Python/pywarpx/fields.py index e44b81ebd..8db6f42c6 100644 --- a/Python/pywarpx/fields.py +++ b/Python/pywarpx/fields.py @@ -140,6 +140,32 @@ class _MultiFABWrapper(object): elif self.dim == 3: return self._getitem3d(index) + def _find_start_stop(self, ii, nn, ngrow, d): + """Given the input index, calculate the start and stop range of the indices. + - ii: index, either a slice object or an integer + - nn: the global number of cells along the specified direction + - ngrow: list of the number of extra cells, i.e. guard cells + - d: the direction, an integer, 0, 1, or 2 + If ii is a slice, the start and stop values are used directly, + unless they are None, then the lower or upper bound is used. + An assertion checks if the indices are within the bounds. + """ + if isinstance(ii, slice): + if ii.start is None: + iistart = -ngrow[d] + else: + iistart = ii.start + if ii.stop is None: + iistop = nn + self.overlaps[d] + ngrow[d] + else: + iistop = ii.stop + else: + iistart = ii + iistop = ii + 1 + assert -ngrow[d] <= iistart <= nn + self.overlaps[d] + ngrow[d], Exception(f'Dimension {d} lower index is out of bounds') + assert -ngrow[d] <= iistop <= nn + self.overlaps[d] + ngrow[d], Exception(f'Dimension {d} upper index is out of bounds') + return iistart, iistop + def _getitem3d(self, index): """Returns slices of a 3D decomposed array, """ @@ -174,24 +200,9 @@ class _MultiFABWrapper(object): ny = comm_world.allreduce(ny, op=mpi.MAX) nz = comm_world.allreduce(nz, op=mpi.MAX) - if isinstance(ix, slice): - ixstart = max(ix.start or -ngrow[0], -ngrow[0]) - ixstop = min(ix.stop or nx + 1 + ngrow[0], nx + self.overlaps[0] + ngrow[0]) - else: - ixstart = ix - ixstop = ix + 1 - if isinstance(iy, slice): - iystart = max(iy.start or -ngrow[1], -ngrow[1]) - iystop = min(iy.stop or ny + 1 + ngrow[1], ny + self.overlaps[1] + ngrow[1]) - else: - iystart = iy - iystop = iy + 1 - if isinstance(iz, slice): - izstart = max(iz.start or -ngrow[2], -ngrow[2]) - izstop = min(iz.stop or nz + 1 + ngrow[2], nz + self.overlaps[2] + ngrow[2]) - else: - izstart = iz - izstop = iz + 1 + ixstart, ixstop = self._find_start_stop(ix, nx, ngrow, 0) + iystart, iystop = self._find_start_stop(iy, ny, ngrow, 1) + izstart, izstop = self._find_start_stop(iz, nz, ngrow, 2) # --- Setup the size of the array to be returned and create it. # --- Space is added for multiple components if needed. @@ -278,18 +289,8 @@ class _MultiFABWrapper(object): nx = comm_world.allreduce(nx, op=mpi.MAX) nz = comm_world.allreduce(nz, op=mpi.MAX) - if isinstance(ix, slice): - ixstart = max(ix.start or -ngrow[0], -ngrow[0]) - ixstop = min(ix.stop or nx + 1 + ngrow[0], nx + self.overlaps[0] + ngrow[0]) - else: - ixstart = ix - ixstop = ix + 1 - if isinstance(iz, slice): - izstart = max(iz.start or -ngrow[1], -ngrow[1]) - izstop = min(iz.stop or nz + 1 + ngrow[1], nz + self.overlaps[1] + ngrow[1]) - else: - izstart = iz - izstop = iz + 1 + ixstart, ixstop = self._find_start_stop(ix, nx, ngrow, 0) + izstart, izstop = self._find_start_stop(iz, nz, ngrow, 1) # --- Setup the size of the array to be returned and create it. # --- Space is added for multiple components if needed. |