PETSc version 3.17.5
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TaoSoftThreshold

 Calculates soft thresholding routine with input vector and given lower and upper bound and returns it to output vector.

Synopsis

#include "petsctao.h" 
PetscErrorCode TaoSoftThreshold(Vec in, PetscReal lb, PetscReal ub, Vec out)

Input Parameters

in - input vector to be thresholded
lb - lower bound
ub - upper bound

Output Parameter

out - Soft thresholded output vector

Notes

Soft thresholding is defined as \[ S(input,lb,ub) = \begin{cases} input - ub \text{input > ub} \\ 0 \text{lb =< input <= ub} \\ input + lb \text{input < lb} \\ \]

Level

developer

Location

src/tao/util/tao_util.c

Examples

src/tao/constrained/tutorials/tomographyADMM.c.html
src/tao/tutorials/ex4.c.html

Index of all Tao routines
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Index of all manual pages