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} \ ]

See Also#

Tao, Vec

Level#

developer

Location#

src/tao/util/tao_util.c

Examples#

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

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Index of all Tao routines
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Index of all manual pages