DSGetMatAndColumn#

Returns a sequential dense Mat object containing the requested matrix and one of its columns as a Vec.

Synopsis#

#include "slepcds.h" 
PetscErrorCode DSGetMatAndColumn(DS ds,DSMatType m,PetscInt col,Mat *A,Vec *v)

Not Collective

Input Parameters#

  • ds - the direct solver context

  • m - the requested matrix

  • col - the index of the requested column

Output Parameters#

  • A - Mat object

  • v - Vec object (the column)

Notes#

This calls DSGetMat() and then it extracts the selected column. The user must call DSRestoreMatAndColumn() to recover the original state. For matrices DS_MAT_T and DS_MAT_D, in complex scalars this function implies copying from real values stored internally to scalar values in the Vec.

See Also#

DS: Direct Solver (or Dense System), DSRestoreMatAndColumn(), DSGetMat()

Level#

advanced

Location#

src/sys/classes/ds/interface/dsops.c

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