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sspev (3)
  • >> sspev (3) ( Solaris man: Библиотечные вызовы )
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    NAME
         sspev - compute all the eigenvalues and, optionally,  eigen-
         vectors of a real symmetric matrix A in packed storage
    
    SYNOPSIS
         SUBROUTINE SSPEV( JOBZ, UPLO, N, AP, W, Z, LDZ, WORK, INFO )
    
         CHARACTER JOBZ, UPLO
    
         INTEGER INFO, LDZ, N
    
         REAL AP( * ), W( * ), WORK( * ), Z( LDZ, * )
    
    
    
         #include <sunperf.h>
    
         void sspev(char jobz, char uplo, int n,  float  *sap,  float
                   *w, float *sz, int ldz, int *info) ;
    
    PURPOSE
         SSPEV computes all the eigenvalues and,  optionally,  eigen-
         vectors of a real symmetric matrix A in packed storage.
    
    
    ARGUMENTS
         JOBZ      (input) CHARACTER*1
                   = 'N':  Compute eigenvalues only;
                   = 'V':  Compute eigenvalues and eigenvectors.
    
         UPLO      (input) CHARACTER*1
                   = 'U':  Upper triangle of A is stored;
                   = 'L':  Lower triangle of A is stored.
    
         N         (input) INTEGER
                   The order of the matrix A.  N >= 0.
    
         AP        (input/output) REAL array, dimension (N*(N+1)/2)
                   On entry, the upper or lower triangle of the  sym-
                   metric  matrix  A,  packed  columnwise in a linear
                   array.  The j-th column of  A  is  stored  in  the
                   array  AP  as  follows:  if UPLO = 'U', AP(i + (j-
                   1)*j/2) = A(i,j) for 1<=i<=j; if UPLO = 'L',  AP(i
                   + (j-1)*(2*n-j)/2) = A(i,j) for j<=i<=n.
    
                   On exit, AP is  overwritten  by  values  generated
                   during the reduction to tridiagonal form.  If UPLO
                   = 'U', the diagonal and first superdiagonal of the
                   tridiagonal  matrix  T overwrite the corresponding
                   elements of A, and if UPLO = 'L', the diagonal and
                   first subdiagonal of T overwrite the corresponding
                   elements of A.
    
         W         (output) REAL array, dimension (N)
                   If INFO = 0, the eigenvalues in ascending order.
    
         Z         (output) REAL array, dimension (LDZ, N)
                   If JOBZ = 'V', then if INFO = 0,  Z  contains  the
                   orthonormal eigenvectors of the matrix A, with the
                   i-th column of Z holding the  eigenvector  associ-
                   ated  with  W(i).   If  JOBZ  = 'N', then Z is not
                   referenced.
    
         LDZ       (input) INTEGER
                   The leading dimension of the array Z.  LDZ  >=  1,
                   and if JOBZ = 'V', LDZ >= max(1,N).
    
         WORK      (workspace) REAL array, dimension (3*N)
    
         INFO      (output) INTEGER
                   = 0:  successful exit.
                   < 0:  if INFO = -i, the i-th argument had an ille-
                   gal value.
                   > 0:  if INFO = i, the algorithm  failed  to  con-
                   verge;  i off-diagonal elements of an intermediate
                   tridiagonal form did not converge to zero.
    
    
    
    


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