Enum EnergyScaleJacobianMethod 

pub enum EnergyScaleJacobianMethod {
    FiniteDifference,
    PartialGal,
}

Method for computing the t0 / L_scale columns of the EnergyScaleTransmissionModel Jacobian.

• PartialGal: central FD on t0 only (2 evaluations); derive the L_scale column inline via the rank-1 identity J[:, L_scale] = ((tof - t0) / L_scale) * J[:, t0] per energy bin, halving the FD probe count when both calibration parameters are free.

  Exact only without a resolution operator: with one, L_scale also reaches the prediction through the kernel, which the identity does not model. EnergyScaleTransmissionModel::effective_jacobian_method therefore falls back to FiniteDifference whenever a kernel is present, so this variant applies to unresolved fits.

• FiniteDifference: central FD on both columns, 4 forward evaluations per Jacobian (h_t0=1e-4, h_ls=1e-7). Selectable via the NEREIDS_TZERO_JACOBIAN=fd2 env var or the tzero_jacobian="fd2" Python kwarg.

Variants

FiniteDifference

PartialGal

Derives the L_scale column from the t0 column by a rank-1 identity.

Requested rather than guaranteed: it holds only without a resolution kernel, so with one configured EnergyScaleTransmissionModel::effective_jacobian_method uses Self::FiniteDifference regardless.

Trait Implementations

impl Clone for EnergyScaleJacobianMethod

fn clone(&self) -> EnergyScaleJacobianMethod

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for EnergyScaleJacobianMethod

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for EnergyScaleJacobianMethod

fn eq(&self, other: &EnergyScaleJacobianMethod) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for EnergyScaleJacobianMethod

impl Eq for EnergyScaleJacobianMethod

impl StructuralPartialEq for EnergyScaleJacobianMethod