DSMatType

Used to refer to one of the matrices stored internally in DS.

Synopsis

typedef enum { DS_MAT_A,
               DS_MAT_B,
               DS_MAT_C,
               DS_MAT_T,
               DS_MAT_D,
               DS_MAT_Q,
               DS_MAT_Z,
               DS_MAT_X,
               DS_MAT_Y,
               DS_MAT_U,
               DS_MAT_V,
               DS_MAT_W,
               DS_MAT_E0,
               DS_MAT_E1,
               DS_MAT_E2,
               DS_MAT_E3,
               DS_MAT_E4,
               DS_MAT_E5,
               DS_MAT_E6,
               DS_MAT_E7,
               DS_MAT_E8,
               DS_MAT_E9,
               DS_NUM_MAT } DSMatType;

Values

• DS_MAT_A - first matrix of eigenproblem/singular value problem

• DS_MAT_B - second matrix of a generalized eigenproblem

• DS_MAT_C - third matrix of a quadratic eigenproblem (deprecated)

• DS_MAT_T - tridiagonal matrix

• DS_MAT_D - diagonal matrix

• DS_MAT_Q - orthogonal matrix of (right) Schur vectors

• DS_MAT_Z - orthogonal matrix of left Schur vectors

• DS_MAT_X - right eigenvectors

• DS_MAT_Y - left eigenvectors

• DS_MAT_U - left singular vectors

• DS_MAT_V - right singular vectors

• DS_MAT_W - workspace matrix

• DS_MAT_E0 to DS_MAT_E9 - extra matrices, used in DSPEP and DSNEP

Notes

The matrices preferentially refer to the description above, but they may be used for a different purpose depending on the DSType.

All matrices can have space to hold ld x ld elements, except for DS_MAT_T that has space for 3 x ld elements (ld = leading dimension) and DS_MAT_D that has space for just ld elements.

In DSPEP problems, matrices A, B, W can have space for d*ld x d*ld, where d is the polynomial degree, and X can have ld x d*ld. Also DSNEP has exceptions. Check the manual page of each DS type for details.

See Also

DS: Direct Solver (or Dense System), DSAllocate(), DSGetArray(), DSGetArrayReal(), DSVectors(), DSGetLeadingDimension()

Level

advanced

Location

include/slepcds.h

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