petsc-3.12.4 2020-02-04
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# SNESSolve

Solves a nonlinear system F(x) = b. Call SNESSolve() after calling SNESCreate() and optional routines of the form SNESSetXXX().

### Synopsis

    #include "petscsnes.h"
    PetscErrorCode  SNESSolve(SNES snes,Vec b,Vec x)

Collective on SNES

### Input Parameters

| snes | - the SNES context
| b | - the constant part of the equation F(x) = b, or NULL to use zero.
| x | - the solution vector.

### Notes

The user should initialize the vector,x, with the initial guess for the nonlinear solve prior to calling SNESSolve. In particular, to employ an initial guess of zero, the user should explicitly set this vector to zero by calling VecSet().

### See Also

SNESCreate(), SNESDestroy(), SNESSetFunction(), SNESSetJacobian(), SNESSetGridSequence(), SNESGetSolution()

### Level

beginner

### Location

src/snes/interface/snes.c

### Examples

src/snes/examples/tutorials/ex1.c.html
src/snes/examples/tutorials/ex2.c.html
src/snes/examples/tutorials/ex3.c.html
src/snes/examples/tutorials/ex5.c.html
src/snes/examples/tutorials/ex9.c.html
src/snes/examples/tutorials/ex12.c.html
src/snes/examples/tutorials/ex14.c.html
src/snes/examples/tutorials/ex15.c.html
src/snes/examples/tutorials/ex18.c.html
src/snes/examples/tutorials/ex19.c.html
src/snes/examples/tutorials/ex20.c.html

### Implementations

SNESSolve_Composite in src/snes/impls/composite/snescomposite.c
SNESSolve_FAS in src/snes/impls/fas/fas.c
SNESSolve_NGS in src/snes/impls/gs/snesgs.c
SNESSolve_KSPONLY in src/snes/impls/ksponly/ksponly.c
SNESSolve_NEWTONLS in src/snes/impls/ls/ls.c
SNESSolve_MS in src/snes/impls/ms/ms.c
SNESSolve_Multiblock in src/snes/impls/multiblock/multiblock.c
SNESSolve_NASM in src/snes/impls/nasm/nasm.c
SNESSolve_NCG in src/snes/impls/ncg/snesncg.c
SNESSolve_Anderson in src/snes/impls/ngmres/anderson.c
SNESSolve_NGMRES in src/snes/impls/ngmres/snesngmres.c
SNESSolve_Patch in src/snes/impls/patch/snespatch.c
SNESSolve_QN in src/snes/impls/qn/qn.c
SNESSolve_NRichardson in src/snes/impls/richardson/snesrichardson.c
SNESSolve_Shell in src/snes/impls/shell/snesshell.c
SNESSolve_NEWTONTR in src/snes/impls/tr/tr.c
SNESSolve_VINEWTONRSLS in src/snes/impls/vi/rs/virs.c
SNESSolve_VINEWTONSSLS in src/snes/impls/vi/ss/viss.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages