CentOS 7.0 - man page for sspev (centos section 3)

Linux & Unix Commands - Search Man Pages

Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)

sspev.f(3)				      LAPACK				       sspev.f(3)

       sspev.f -

       subroutine sspev (JOBZ, UPLO, N, AP, W, Z, LDZ, WORK, INFO)
	    SSPEV computes the eigenvalues and, optionally, the left and/or right eigenvectors
	   for OTHER matrices

Function/Subroutine Documentation
   subroutine sspev (characterJOBZ, characterUPLO, integerN, real, dimension( * )AP, real,
       dimension( * )W, real, dimension( ldz, * )Z, integerLDZ, real, dimension( * )WORK,
	SSPEV computes the eigenvalues and, optionally, the left and/or right eigenvectors for
       OTHER matrices


	    SSPEV computes all the eigenvalues and, optionally, eigenvectors of a
	    real symmetric matrix A in packed storage.


		     JOBZ is CHARACTER*1
		     = 'N':  Compute eigenvalues only;
		     = 'V':  Compute eigenvalues and eigenvectors.


		     UPLO is CHARACTER*1
		     = 'U':  Upper triangle of A is stored;
		     = 'L':  Lower triangle of A is stored.


		     N is INTEGER
		     The order of the matrix A.  N >= 0.


		     AP is REAL array, dimension (N*(N+1)/2)
		     On entry, the upper or lower triangle of the symmetric 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 is REAL array, dimension (N)
		     If INFO = 0, the eigenvalues in ascending order.


		     Z is 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 associated with W(i).
		     If JOBZ = 'N', then Z is not referenced.


		     LDZ is INTEGER
		     The leading dimension of the array Z.  LDZ >= 1, and if
		     JOBZ = 'V', LDZ >= max(1,N).


		     WORK is REAL array, dimension (3*N)


		     INFO is INTEGER
		     = 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.

	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

	   November 2011

       Definition at line 131 of file sspev.f.

       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2				 Tue Sep 25 2012			       sspev.f(3)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums

All times are GMT -4. The time now is 02:04 AM.

Unix & Linux Forums Content Copyright©1993-2018. All Rights Reserved.
Show Password

Not a Forum Member?
Forgot Password?