DSYEV_PF Subroutine

  1. dsyev_pf.f90
  2. DSYEV_PF
  3. DSYEV_PF

public subroutine DSYEV_PF(JOBZ, UPLO, N, A, LDA, W, WORK, LWORK, INFO)

-- LAPACK driver routine (version 3.7.0) -- -- LAPACK is a software package provided by Univ. of Tennessee, -- -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- December 2016

 .. Scalar Arguments ..
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 .. Local Scalars ..
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 .. External Subroutines ..
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 .. Intrinsic Functions ..
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 .. Executable Statements ..

 Test the input parameters.






 Quick return if possible



 Get machine constants.


 Scale matrix to allowable range, if necessary.


 Call DSYTRD to reduce symmetric matrix to tridiagonal form.


 For eigenvalues only, call DSTERF.  For eigenvectors, first call
 DORGTR to generate the orthogonal matrix, then call DSTEQR.


 If matrix was scaled, then rescale eigenvalues appropriately.


 Set WORK(1) to optimal workspace size.



 End of DSYEV

Arguments

Type IntentOptional AttributesName
integer :: JOBZ
character(len=1) :: UPLO
integer :: N
 ..
 .. Array Arguments ..
double precision :: A(LDA,*)
 ..

=====================================================================

 .. Parameters ..
integer :: LDA
 ..
 .. Array Arguments ..
double precision :: W(*)
 ..

=====================================================================

 .. Parameters ..
double precision :: WORK(*)
 ..

=====================================================================

 .. Parameters ..
integer :: LWORK
 ..
 .. Array Arguments ..
integer :: INFO
 ..
 .. Array Arguments ..

Contents

None