7b01ddd789
Require a finite negative ln_R_per_layer before coefficient evaluation. Document None entries as the supported way to disable a face, and cover zero, signed zero, positive, and nonfinite targets with and without frequency shift. Validation: 209 focused tests passed; Ruff passed.
24 lines
685 B
Markdown
24 lines
685 B
Markdown
# fdtd
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::: meanas.fdtd
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## Core update and analysis helpers
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::: meanas.fdtd.base
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::: meanas.fdtd.pml
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::: meanas.fdtd.boundaries
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::: meanas.fdtd.energy
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::: meanas.fdtd.phasor
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CPML derivatives use electric widths for forward differences and magnetic
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widths for backward differences. `cpml_params(..., dx=1.0)` specifies the uniform
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physical cell width normal to a face; arbitrary nonuniform PML grading is not
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implemented by this constructor. Scale the timestep consistently with the grid.
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`ln_R_per_layer` must be finite and strictly negative. Zero attenuation raises
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`ValueError`; disable individual CPML faces with `None` in the parameter table
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passed to `updates_with_cpml`.
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