ssbev - compute all the eigenvalues and, optionally, eigenvectors of a real symmetric band matrix A
SUBROUTINE SSBEV(JOBZ, UPLO, N, KD, A, LDA, W, Z, LDZ, WORK, INFO) CHARACTER*1 JOBZ, UPLO INTEGER N, KD, LDA, LDZ, INFO REAL A(LDA,*), W(*), Z(LDZ,*), WORK(*) SUBROUTINE SSBEV_64(JOBZ, UPLO, N, KD, A, LDA, W, Z, LDZ, WORK, INFO) CHARACTER*1 JOBZ, UPLO INTEGER*8 N, KD, LDA, LDZ, INFO REAL A(LDA,*), W(*), Z(LDZ,*), WORK(*) F95 INTERFACE SUBROUTINE SBEV(JOBZ, UPLO, N, KD, A, LDA, W, Z, LDZ, WORK, INFO) CHARACTER(LEN=1) :: JOBZ, UPLO INTEGER :: N, KD, LDA, LDZ, INFO REAL, DIMENSION(:) :: W, WORK REAL, DIMENSION(:,:) :: A, Z SUBROUTINE SBEV_64(JOBZ, UPLO, N, KD, A, LDA, W, Z, LDZ, WORK, INFO) CHARACTER(LEN=1) :: JOBZ, UPLO INTEGER(8) :: N, KD, LDA, LDZ, INFO REAL, DIMENSION(:) :: W, WORK REAL, DIMENSION(:,:) :: A, Z C INTERFACE #include <sunperf.h> void ssbev(char jobz, char uplo, int n, int kd, float *a, int lda, float *w, float *z, int ldz, int *info); void ssbev_64(char jobz, char uplo, long n, long kd, float *a, long lda, float *w, float *z, long ldz, long *info);
Oracle Solaris Studio Performance Library ssbev(3P) NAME ssbev - compute all the eigenvalues and, optionally, eigenvectors of a real symmetric band matrix A SYNOPSIS SUBROUTINE SSBEV(JOBZ, UPLO, N, KD, A, LDA, W, Z, LDZ, WORK, INFO) CHARACTER*1 JOBZ, UPLO INTEGER N, KD, LDA, LDZ, INFO REAL A(LDA,*), W(*), Z(LDZ,*), WORK(*) SUBROUTINE SSBEV_64(JOBZ, UPLO, N, KD, A, LDA, W, Z, LDZ, WORK, INFO) CHARACTER*1 JOBZ, UPLO INTEGER*8 N, KD, LDA, LDZ, INFO REAL A(LDA,*), W(*), Z(LDZ,*), WORK(*) F95 INTERFACE SUBROUTINE SBEV(JOBZ, UPLO, N, KD, A, LDA, W, Z, LDZ, WORK, INFO) CHARACTER(LEN=1) :: JOBZ, UPLO INTEGER :: N, KD, LDA, LDZ, INFO REAL, DIMENSION(:) :: W, WORK REAL, DIMENSION(:,:) :: A, Z SUBROUTINE SBEV_64(JOBZ, UPLO, N, KD, A, LDA, W, Z, LDZ, WORK, INFO) CHARACTER(LEN=1) :: JOBZ, UPLO INTEGER(8) :: N, KD, LDA, LDZ, INFO REAL, DIMENSION(:) :: W, WORK REAL, DIMENSION(:,:) :: A, Z C INTERFACE #include <sunperf.h> void ssbev(char jobz, char uplo, int n, int kd, float *a, int lda, float *w, float *z, int ldz, int *info); void ssbev_64(char jobz, char uplo, long n, long kd, float *a, long lda, float *w, float *z, long ldz, long *info); PURPOSE ssbev computes all the eigenvalues and, optionally, eigenvectors of a real symmetric band matrix A. ARGUMENTS JOBZ (input) = 'N': Compute eigenvalues only; = 'V': Compute eigenvalues and eigenvectors. UPLO (input) = 'U': Upper triangle of A is stored; = 'L': Lower triangle of A is stored. N (input) The order of the matrix A. N >= 0. KD (input) The number of superdiagonals of the matrix A if UPLO = 'U', or the number of subdiagonals if UPLO = 'L'. KD >= 0. A (input/output) On entry, the upper or lower triangle of the symmetric band matrix A, stored in the first KD+1 rows of the array. The j- th column of A is stored in the j-th column of the array A as follows: if UPLO = 'U', A(kd+1+i-j,j) = A(i,j) for max(1,j- kd)<=i<=j; if UPLO = 'L', A(1+i-j,j) = A(i,j) for j<=i<=min(n,j+kd). On exit, A is overwritten by values generated during the reduction to tridiagonal form. If UPLO = 'U', the first superdiagonal and the diagonal of the tridiagonal matrix T are returned in rows KD and KD+1 of A, and if UPLO = 'L', the diagonal and first subdiagonal of T are returned in the first two rows of A. LDA (input) The leading dimension of the array A. LDA >= KD + 1. W (output) If INFO = 0, the eigenvalues in ascending order. Z (output) If JOBZ = 'V', then if INFO = 0, Z contains the orthonormal eigenvectors of the matrix A, with the i-th column of Z hold- ing the eigenvector associated with W(i). If JOBZ = 'N', then Z is not referenced. LDZ (input) The leading dimension of the array Z. LDZ >= 1, and if JOBZ = 'V', LDZ >= max(1,N). WORK (workspace) dimension(MAX(1,3*N-2)) INFO (output) = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value > 0: if INFO = i, the algorithm failed to converge; i off- diagonal elements of an intermediate tridiagonal form did not converge to zero. 7 Nov 2015 ssbev(3P)