MatDiagonalGetInverseDiagonal

Get the inverse diagonal of a MATDIAGONAL

Synopsis

#include "petscmat.h" 
PetscErrorCode MatDiagonalGetInverseDiagonal(Mat A, Vec *inv_diag)

Input Parameter

• A - the MATDIAGONAL

Output Parameter

• inv_diag - the Vec that defines the inverse diagonal

Note

The user must call MatDiagonalRestoreInverseDiagonal() before using the matrix again.

If a matrix is created only to call MatSolve() (which happens for MATLMVMDIAGBROYDEN), using MatDiagonalGetInverseDiagonal() and MatDiagonalRestoreInverseDiagonal() avoids copies and avoids any call to VecReciprocal().

See Also

Matrices, MATDIAGONAL, MatCreateDiagonal(), MatDiagonalRestoreInverseDiagonal(), MatDiagonalGetDiagonal(), MATLMVMBROYDEN, MatSolve()

Level

developer

Location

src/mat/impls/diagonal/diagonal.c

Implementations

MatDiagonalGetInverseDiagonal_Diagonal() in src/mat/impls/diagonal/diagonal.c

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