PETSc version 3.17.4
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# SNESTSFormFunction

Function to evaluate nonlinear residual

### Synopsis

    #include "petscts.h"
    PetscErrorCode  SNESTSFormFunction(SNES snes,Vec U,Vec F,void *ctx)

Logically Collective on SNES

### Input Parameters

| snes | - nonlinear solver
| U | - the current state at which to evaluate the residual
| ctx | - user context, must be a TS

### Output Parameter

| F | - the nonlinear residual

### Notes

This function is not normally called by users and is automatically registered with the SNES used by TS. It is most frequently passed to MatFDColoringSetFunction().

### See Also

SNESSetFunction(), MatFDColoringSetFunction()

### Level

advanced

### Location

src/ts/interface/ts.c

### Implementations

SNESTSFormFunction_ARKIMEX in src/ts/impls/arkimex/arkimex.c
SNESTSFormFunction_BDF in src/ts/impls/bdf/bdf.c
SNESTSFormFunction_EIMEX in src/ts/impls/eimex/eimex.c
SNESTSFormFunction_RK in src/ts/impls/explicit/rk/rk.c
SNESTSFormFunction_GLEE in src/ts/impls/glee/glee.c
SNESTSFormFunction_Alpha in src/ts/impls/implicit/alpha/alpha1.c
SNESTSFormFunction_Alpha in src/ts/impls/implicit/alpha/alpha2.c
SNESTSFormFunction_DiscGrad in src/ts/impls/implicit/discgrad/tsdiscgrad.c
SNESTSFormFunction_GLLE in src/ts/impls/implicit/glle/glle.c
SNESTSFormFunction_IRK in src/ts/impls/implicit/irk/irk.c
SNESTSFormFunction_Theta in src/ts/impls/implicit/theta/theta.c
SNESTSFormFunction_Mimex in src/ts/impls/mimex/mimex.c
SNESTSFormFunction_Pseudo in src/ts/impls/pseudo/posindep.c
SNESTSFormFunction_RosW in src/ts/impls/rosw/rosw.c
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