SimPEG.regularization.PGIsmallness.deriv

PGIsmallness.deriv(m)

The regularization is:

\[R(m) = \frac{1}{2}\mathbf{(m-m_\text{ref})^\top W^\top W(m-m_\text{ref})}\]

So the derivative is straight forward:

\[R(m) = \mathbf{W^\top W (m-m_\text{ref})}\]