simpeg.electromagnetics.natural_source.Simulation3DPrimarySecondary.getRHSDeriv#

Simulation3DPrimarySecondary.getRHSDeriv(freq, src, v, adjoint=False)[source]#

Derivative of the right-hand side times a vector for a given source and frequency.

The right-hand side for each source is constructed according to:

$$\mathbf{q}=-i\omega {\mathbf{s}}_{\mathbf{e}}-i\omega {\mathbf{C}}^{\mathbf{T}}{\mathbf{M}}_{\mathbf{f}\frac{\mathbf{1}}{\mu }}{\mathbf{s}}_{\mathbf{m}}$$

where

• $\mathbf{C}$ is the discrete curl operator

• ${\mathbf{s}}_{\mathbf{m}}$ and ${\mathbf{s}}_{\mathbf{e}}$ are the integrated magnetic and electric source terms, respectively

• ${\mathbf{M}}_{\mathbf{f}\frac{\mathbf{1}}{\mu }}$ is the inner-product matrices for inverse permeabilities projected to faces

See the Notes section of the doc strings for Simulation3DElectricField for a full description of the formulation.

Where $\mathbf{m}$ are the set of model parameters and $\mathbf{v}$ is a vector, this method returns

$$\frac{\partial {\mathbf{q}}_{\mathbf{k}}}{\partial \mathbf{m}}\mathbf{v}$$

Or the adjoint operation

$${\frac{\partial {\mathbf{q}}_{\mathbf{k}}}{\partial \mathbf{m}}}^T\mathbf{v}$$

Parameters:

freqint

The frequency in Hz.

srcfrequency_domain.sources.BaseFDEMSrc

The FDEM source object.

vnumpy.ndarray

The vector. (n_param,) for the standard operation. (n_edges,) for the adjoint operation.

adjointbool

Whether to perform the adjoint operation.

Returns:

numpy.ndarray

Derivative of the right-hand sides times a vector. (n_edges,) for the standard operation. (n_param,) for the adjoint operation.