DSGetDimensions#

Returns the current dimensions.

Synopsis#

#include "slepcds.h" 
PetscErrorCode DSGetDimensions(DS ds,PetscInt *n,PetscInt *l,PetscInt *k,PetscInt *t)

Not Collective

Input Parameter#

  • ds - the direct solver context

Output Parameters#

  • n - the current size

  • l - number of locked (inactive) leading columns

  • k - intermediate dimension (e.g., position of arrow)

  • t - truncated length

Notes#

The t parameter makes sense only if DSTruncate() has been called. Otherwise its value equals n.

Some DS types have additional dimensions, e.g., the number of columns in DSSVD. For these, you should call a specific interface function.

See Also#

DS: Direct Solver (or Dense System), DSSetDimensions(), DSTruncate(), DSSVDGetDimensions()

Level#

intermediate

Location#

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

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