Provided by: liblapack-doc_3.3.1-1_all bug

NAME

       LAPACK-3 - DLA_PORCOND Estimate the Skeel condition number of op(A) * op2(C)  where op2 is
       determined by CMODE as follows  CMODE = 1 op2(C) = C  CMODE = 0 op2(C) =  I   CMODE  =  -1
       op2(C)  = inv(C)  The Skeel condition number cond(A) = norminf( |inv(A)||A| )  is computed
       by computing scaling factors  R  such  that   diag(R)*A*op2(C)  is  row  equilibrated  and
       computing the standard  infinity-norm condition number

SYNOPSIS

       DOUBLE PRECISION FUNCTION  DLA_PORCOND(  UPLO,  N, A, LDA, AF, LDAF, CMODE, C, INFO, WORK,
                        IWORK )

           IMPLICIT     NONE

           CHARACTER    UPLO

           INTEGER      N, LDA, LDAF, INFO, CMODE

           DOUBLE       PRECISION A( LDA, * ), AF( LDAF, * ), WORK( * ), C( * )

           INTEGER      IWORK( * )

PURPOSE

          DLA_PORCOND Estimates the Skeel condition number of  op(A) * op2(C)
          where op2 is determined by CMODE as follows
          CMODE =  1    op2(C) = C
          CMODE =  0    op2(C) = I
          CMODE = -1    op2(C) = inv(C)
          The Skeel condition number  cond(A) = norminf( |inv(A)||A| )
          is computed by computing scaling factors R such that
          diag(R)*A*op2(C) is row equilibrated and computing the standard
          infinity-norm condition number.

ARGUMENTS

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

        N       (input) INTEGER
                The number of linear equations, i.e., the order of the
                matrix A.  N >= 0.

        A       (input) DOUBLE PRECISION array, dimension (LDA,N)
                On entry, the N-by-N matrix A.

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

        AF      (input) DOUBLE PRECISION array, dimension (LDAF,N)
                The triangular factor U or L from the Cholesky factorization
                A = U**T*U or A = L*L**T, as computed by DPOTRF.

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

        CMODE   (input) INTEGER
                Determines op2(C) in the formula op(A) * op2(C) as follows:
                CMODE =  1    op2(C) = C
                CMODE =  0    op2(C) = I
                CMODE = -1    op2(C) = inv(C)

        C       (input) DOUBLE PRECISION array, dimension (N)
                The vector C in the formula op(A) * op2(C).

        INFO    (output) INTEGER
                = 0:  Successful exit.
                i > 0:  The ith argument is invalid.

        WORK    (input) DOUBLE PRECISION array, dimension (3*N).
                Workspace.

        IWORK   (input) INTEGER array, dimension (N).
                Workspace.

    LAPACK routine (version 3.2.2)          April 2011                       DLA_PORCOND(3lapack)