petsc-3.12.1 2019-10-22
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# Documentation: Changes: 2.2.0

## CHANGES in PETSc 2.2.0

#### General:

- Changed petscengine.h to petscmatlab.h
- Changed PetscOptionsEList() to return the index of the string selected by the user (error if user enters impossible string)

#### Vec:

- VecLoad() has a new argument giving the Vector type to be created

#### Mat:

- If you use MAT_SYMMETRIC as option for MatSetOption() you will likely need to also use the option MAT_SYMMETRY_ETERNAL otherwise at the next MatAssembly the matrix will likly lose the symmetry flag.
- Added MatISGetLocalMat() to allow preallocating the local matrix.

#### PC:

#### KSP:

- changed unmodifiedGramSchmidt name to classicalGramSchmidt everywhere.
- Eliminated KSPGMRESIROrthogonalize() now have KSPGMRESSetCGSRefinement() to decide when to use iterative refinement
- The SLES object has been removed from PETSc. All of this options are available via the KSP object. For example, -sles_view_binary ->ksp_view_binary, SLESCreate()->KSPCreate() The calling sequences SLESSetUp(sles,b,x) should be replaced with KSPSetRhs(ksp,b) KSPSetSolution(ksp,x) KSPSetUp(ksp). Similarly SLESSolve(sles,b,x) should be replaced with KSPSetRhs(ksp,b) KSPSetSolution(ksp,x) KSPSolve(ksp)
- removed its argument from KSPSolve. Obtain the number of iterations via KSPGetIterationNumber()

#### SNES:

- SNESSolve() no longer returns number of iterations, use SNESGetIterationNumber() to get the number of iterations required

#### TS:

#### DMMG:

- Added support for -dmmg_galerkin and DMMGSetUseGalerkin() for nonlinear problems (not sequential only)

#### SYS:

- added new PETSC_VIEWER_MATLAB for saving variables to Matlab .mat files
- eliminated PetscViewerXXXXType and PetscViewerXXXSetType() replaced with PetscViewerFileType and PetscViewerSetFileType()
- PETSC_BINARY_RDONLY,PETSC_BINARY_WRONLY,PETSC_BINARY_CREATE becomes PETSC_FILE_RDONLY,PETSC_FILE_WRONLY,PETSC_FILE_CREATE

#### Fortran:

#### ExternalPackages: