petsc-3.10.5 2019-03-28
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# SNESLineSearchBTGetAlpha

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

### Synopsis

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

### Input Parameters

linesearch -linesearch context

### Output Parameters

alpha -The descent parameter

### See Also

SNESLineSearchGetLambda(), 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