Fig. 1From: 3-D inversion of magnetic data based on the L1–L2 norm regularizationA plot of the soft-thresholding operator. The solid line indicates \(\hat{\varvec{\beta }}_{\lambda }= \mathcal {S}(\varvec{x}^T\varvec{f}, \lambda )/\varvec{x}^T\varvec{x}\), and dashed line is \(\hat{\varvec{\beta }}_0=\varvec{x}^T\varvec{f}/\varvec{x}^T\varvec{x}\), respectivelyBack to article page