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Fixup slices

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This commit is contained in:
Jan Petykiewicz 2019-08-07 01:01:35 -07:00
parent 2c91ea249f
commit 1a04bab361
1 changed files with 16 additions and 6 deletions
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22
meanas/fdfd/waveguide_mode.py
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@ -346,16 +346,26 @@ def compute_source_e(QE: field_t,
mu: field_t = None,
) -> field_t:
"""
Want (AQ-QA) E = -iwJ, where Q is a mask
If E is an eigenmode, AE = 0 so just AQE = -iwJ
Really only need E in 4 cells along axis (0, 0, Emode1, Emode2), find AE (1 fdtd step), then use center 2 cells as src
Want AQE = -iwJ, where Q is mask and normally AE = -iwJ
## Want (AQ-QA) E = -iwJ, where Q is a mask
## If E is an eigenmode, AE = 0 so just AQE = -iwJ
Really only need E in 4 cells along axis (0, 0, Emode1, Emode2), find AE (1 iteration), then use center 2 cells as src
Maybe better to use (0, Emode1, Emode2, Emode3), find AE (1 iteration), then use left 2 cells as src?
"""
slices = tuple(slices)
# Trim a cell from each end of the propagation axis
slices_reduced = list(slices)
slices_reduced[axis] = slice(slices[axis].start + 1, slices[axis].stop - 1)
slices_reduced = tuple(slice(None), *slices_reduced)
for aa in range(3):
if aa == axis:
if polarity > 0:
slices_reduced[axis] = slice(slices[axis].start, slices[axis].start+2)
else:
slices_reduced[axis] = slice(slices[axis].stop-2, slices[axis].stop)
else:
start = slices[aa].start
stop = slices[aa].stop
slices_reduced = (slice(None), *slices_reduced)
# Don't actually need to mask out E here since it needs to be pre-masked (QE)
@ -410,7 +420,7 @@ def compute_overlap_ce(E: field_t,
slices2 = list(slices)
slices2[axis] = slice(start, stop)
slices2 = tuple(slice(None), slices2)
slices2 = (slice(None), *slices2)
Etgt = numpy.zeros_like(Ee)
Etgt[slices2] = Ee[slices2]