SNESNewtonALGetLoadParameter

Get the value of the load parameter lambda for the arc-length continuation method.

Synopsis

#include "petscsnes.h" 
PetscErrorCode SNESNewtonALGetLoadParameter(SNES snes, PetscReal *lambda)

Logically Collective

Input Parameter

• snes - the nonlinear solver object

Output Parameter

• lambda - the arc-length parameter

Notes

This function should be used in the functions provided to SNESSetFunction() and SNESNewtonALSetFunction() to compute the residual and tangent load vectors for a given value of lambda (0 <= lambda <= 1).

Usually, lambda is used to scale the external force vector in the residual function, i.e. proportional loading, in which case the tangent load vector is the full external force vector.

See Also

SNES: Nonlinear Solvers, SNES, SNESNEWTONAL, SNESNewtonALSetFunction()

Level

intermediate

Location

src/snes/impls/al/al.c

Examples

src/snes/tutorials/ex16.c

Implementations

SNESNewtonALGetLoadParameter_NEWTONAL() in src/snes/impls/al/al.c

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