petsc-3.6.2 2015-10-02
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# TSSetPreStage

Sets the general-purpose function called once at the beginning of each stage.

### Synopsis

    #include "petscts.h"
    PetscErrorCode  TSSetPreStage(TS ts, PetscErrorCode (*func)(TS,PetscReal))

Logically Collective on TS

### Input Parameters

| ts | - The TS context obtained from TSCreate()
| func | - The function

### Calling sequence of func

PetscErrorCode func(TS ts, PetscReal stagetime); -

### Note

There may be several stages per time step. If the solve for a given stage fails, the step may be rejected and retried. The time step number being computed can be queried using TSGetTimeStepNumber() and the total size of the step being attempted can be obtained using TSGetTimeStep(). The time at the start of the step is available via TSGetTime().

### Keywords

TS, timestep

### See Also

TSSetPostStage(), TSSetPreStep(), TSSetPostStep(), TSGetApplicationContext()

Level:intermediate
Location: src/ts/interface/ts.c
Index of all TS routines
Table of Contents for all manual pages
Index of all manual pages