slepc-3.21.1 2024-04-26
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# 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;

### Notes

The matrices preferentially refer to

| 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_Ex | - extra matrices (x=0,..,9)

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

DSAllocate(), DSGetArray(), DSGetArrayReal(), DSVectors()

### Level

advanced

### Location

include/slepcds.h
Index of all DS routines
Table of Contents for all manual pages
Index of all manual pages