petsc-3.14.5 2021-03-03
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# SNESLineSearchBTSetAlpha

Sets the descent parameter, alpha, in the BT linesearch variant.

### Synopsis

    #include "petscsnes.h"
    PetscErrorCode SNESLineSearchBTSetAlpha(SNESLineSearch linesearch, PetscReal alpha)

### Input Parameters

| linesearch | - linesearch context
| alpha | - The descent parameter

### See Also

SNESLineSearchSetLambda(), SNESLineSearchGetTolerances() SNESLINESEARCHBT

### Level

intermediate

### Location

src/snes/linesearch/impls/bt/linesearchbt.c
Index of all SNES routines
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Index of all manual pages