petsc-3.12.5 2020-03-29

MatReuse

Indicates if matrices obtained from a previous call to MatCreateSubMatrices(), MatCreateSubMatrix(), MatConvert() or several other functions are to be reused to store the new matrix values.

typedef enum {MAT_INITIAL_MATRIX,MAT_REUSE_MATRIX,MAT_IGNORE_MATRIX,MAT_INPLACE_MATRIX} MatReuse;

 MAT_INITIAL_MATRIX - create a new matrix

 MAT_REUSE_MATRIX - reuse the matrix created with a previous call that used MAT_INITIAL_MATRIX

 MAT_INPLACE_MATRIX - replace the first input matrix with the new matrix (not applicable to all functions)

 MAT_IGNORE_MATRIX - do not create a new matrix or reuse a give matrix, just ignore that matrix argument (not applicable to all functions)

Any additions/changes here MUST also be made in include/petsc/finclude/petscmat.h

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