Module active_mask 

Active-bin masking for fit-energy-range restriction.

SAMMY EMIN/EMAX equivalent (INPut-file card set 2, manual Table VI A.1). When a user restricts the fit to [E_min, E_max], the GUI extends the energy grid by ~5×FWHM beyond each boundary so resonances near the boundaries are correctly broadened, and the cost-function paths (LM transmission, joint-Poisson PBD) consult the mask returned here to skip residual contributions outside [E_min, E_max].

Returns None when no range is set; callers treat that as “all bins active” (default behaviour).

Functions

active_count

Active-bin count for a mask. None = all bins active.

build_active_mask

Build a per-bin active mask from the energy grid and an optional user-specified [E_min, E_max] range. Bin i is active iff E_min ≤ energies[i] ≤ E_max.