sbevd#

Functions

void ssbevd(
    const char*          jobz,
    const char*          uplo,
    const INT            n,
    const INT            kd,
          f32*  restrict AB,
    const INT            ldab,
          f32*  restrict W,
          f32*  restrict Z,
    const INT            ldz,
          f32*  restrict work,
    const INT            lwork,
          INT*  restrict iwork,
    const INT            liwork,
          INT*           info
);
void ssbevd(const char *jobz, const char *uplo, const INT n, const INT kd, f32 *restrict AB, const INT ldab, f32 *restrict W, f32 *restrict Z, const INT ldz, f32 *restrict work, const INT lwork, INT *restrict iwork, const INT liwork, INT *info)#

SSBEVD computes all the eigenvalues and, optionally, eigenvectors of a real symmetric band matrix A.

If eigenvectors are desired, it uses a divide and conquer algorithm.

Parameters

in
jobz

= ‘N’: Compute eigenvalues only = ‘V’: Compute eigenvalues and eigenvectors

in
uplo

= ‘U’: Upper triangle of A is stored = ‘L’: Lower triangle of A is stored

in
n

The order of the matrix A. n >= 0.

in
kd

The number of super-diagonals (if uplo=’U’) or sub-diagonals (if uplo=’L’). kd >= 0.

inout
AB

The banded matrix A. Array of dimension (ldab, n).

in
ldab

The leading dimension of AB. ldab >= kd+1.

out
W

The eigenvalues in ascending order. Array of dimension (n).

out
Z

If jobz=’V’, the orthonormal eigenvectors. Array of dimension (ldz, n).

in
ldz

The leading dimension of Z. ldz >= 1, and >= n if jobz=’V’.

out
work

Workspace array of dimension (lwork).

in
lwork

The dimension of work. If lwork=-1, workspace query.

out
iwork

Integer workspace array of dimension (liwork).

in
liwork

The dimension of iwork. If liwork=-1, workspace query.

out
info

  • = 0: successful exit

  • < 0: if info = -i, the i-th argument had an illegal value

  • > 0: if info = i, the algorithm failed to converge

Functions

void dsbevd(
    const char*          jobz,
    const char*          uplo,
    const INT            n,
    const INT            kd,
          f64*  restrict AB,
    const INT            ldab,
          f64*  restrict W,
          f64*  restrict Z,
    const INT            ldz,
          f64*  restrict work,
    const INT            lwork,
          INT*  restrict iwork,
    const INT            liwork,
          INT*           info
);
void dsbevd(const char *jobz, const char *uplo, const INT n, const INT kd, f64 *restrict AB, const INT ldab, f64 *restrict W, f64 *restrict Z, const INT ldz, f64 *restrict work, const INT lwork, INT *restrict iwork, const INT liwork, INT *info)#

DSBEVD computes all the eigenvalues and, optionally, eigenvectors of a real symmetric band matrix A.

If eigenvectors are desired, it uses a divide and conquer algorithm.

Parameters

in
jobz

= ‘N’: Compute eigenvalues only = ‘V’: Compute eigenvalues and eigenvectors

in
uplo

= ‘U’: Upper triangle of A is stored = ‘L’: Lower triangle of A is stored

in
n

The order of the matrix A. n >= 0.

in
kd

The number of super-diagonals (if uplo=’U’) or sub-diagonals (if uplo=’L’). kd >= 0.

inout
AB

The banded matrix A. Array of dimension (ldab, n).

in
ldab

The leading dimension of AB. ldab >= kd+1.

out
W

The eigenvalues in ascending order. Array of dimension (n).

out
Z

If jobz=’V’, the orthonormal eigenvectors. Array of dimension (ldz, n).

in
ldz

The leading dimension of Z. ldz >= 1, and >= n if jobz=’V’.

out
work

Workspace array of dimension (lwork).

in
lwork

The dimension of work. If lwork=-1, workspace query.

out
iwork

Integer workspace array of dimension (liwork).

in
liwork

The dimension of iwork. If liwork=-1, workspace query.

out
info

  • = 0: successful exit

  • < 0: if info = -i, the i-th argument had an illegal value

  • > 0: if info = i, the algorithm failed to converge

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