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## zla_syrcond_c()

double precision function zla_syrcond_c | ( | character | uplo,
|  | integer | n,
|  | complex*16, dimension( lda, * ) | a,
|  | integer | lda,
|  | complex*16, dimension( ldaf, * ) | af,
|  | integer | ldaf,
|  | integer, dimension( * ) | ipiv,
|  | double precision, dimension( * ) | c,
|  | logical | capply,
|  | integer | info,
|  | complex*16, dimension( * ) | work,
|  | double precision, dimension( * ) | rwork )

ZLA_SYRCOND_C computes the infinity norm condition number of op(A)*inv(diag(c)) for symmetric indefinite matrices.

Download ZLA_SYRCOND_C + dependencies [TGZ] [ZIP] [TXT]

Purpose:

      !>
      !>    ZLA_SYRCOND_C Computes the infinity norm condition number of
      !>    op(A) * inv(diag(C)) where C is a DOUBLE PRECISION vector.
      !>

Parameters

  [in]

  UPLO

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

  [in]

  N

      !>          N is INTEGER
      !>     The number of linear equations, i.e., the order of the
      !>     matrix A.  N >= 0.
      !>

  [in]

  A

      !>          A is COMPLEX*16 array, dimension (LDA,N)
      !>     On entry, the N-by-N matrix A
      !>

  [in]

  LDA

      !>          LDA is INTEGER
      !>     The leading dimension of the array A.  LDA >= max(1,N).
      !>

  [in]

  AF

      !>          AF is COMPLEX*16 array, dimension (LDAF,N)
      !>     The block diagonal matrix D and the multipliers used to
      !>     obtain the factor U or L as computed by ZSYTRF.
      !>

  [in]

  LDAF

      !>          LDAF is INTEGER
      !>     The leading dimension of the array AF.  LDAF >= max(1,N).
      !>

  [in]

  IPIV

      !>          IPIV is INTEGER array, dimension (N)
      !>     Details of the interchanges and the block structure of D
      !>     as determined by ZSYTRF.
      !>

  [in]

  C

      !>          C is DOUBLE PRECISION array, dimension (N)
      !>     The vector C in the formula op(A) * inv(diag(C)).
      !>

  [in]

  CAPPLY

      !>          CAPPLY is LOGICAL
      !>     If .TRUE. then access the vector C in the formula above.
      !>

  [out]

  INFO

      !>          INFO is INTEGER
      !>       = 0:  Successful exit.
      !>     i > 0:  The ith argument is invalid.
      !>

  [out]

  WORK

      !>          WORK is COMPLEX*16 array, dimension (2*N).
      !>     Workspace.
      !>

  [out]

  RWORK

      !>          RWORK is DOUBLE PRECISION array, dimension (N).
      !>     Workspace.
      !>

Author
  Univ. of Tennessee
  Univ. of California Berkeley
  Univ. of Colorado Denver
  NAG Ltd.