SRC/chfrk.f(3)

NAME
SRC/chfrk.f

SYNOPSIS

  Functions/Subroutines
subroutine chfrk (transr, uplo, trans, n, k, alpha, a, lda, beta, c)
CHFRK performs a Hermitian rank-k operation for matrix in RFP format.

Function/Subroutine Documentation

  subroutine chfrk (character transr, character uplo, character trans, integer n, integer k, real alpha, complex, dimension( lda, * ) a, integer lda, real beta, complex, dimension( * ) c)

CHFRK performs a Hermitian rank-k operation for matrix in RFP format.

Purpose:

     Level 3 BLAS like routine for C in RFP Format.
     CHFRK performs one of the Hermitian rank--k operations
        C := alpha*A*A**H + beta*C,
     or
        C := alpha*A**H*A + beta*C,
     where alpha and beta are real scalars, C is an n--by--n Hermitian
     matrix and A is an n--by--k matrix in the first case and a k--by--n
     matrix in the second case.

Parameters
    TRANSR

              TRANSR is CHARACTER*1
              = 'N':  The Normal Form of RFP A is stored;
              = 'C':  The Conjugate-transpose Form of RFP A is stored.

    UPLO

              UPLO is CHARACTER*1
               On  entry,   UPLO  specifies  whether  the  upper  or  lower
               triangular  part  of the  array  C  is to be  referenced  as
               follows:
                  UPLO = 'U' or 'u'   Only the  upper triangular part of  C
                                      is to be referenced.
                  UPLO = 'L' or 'l'   Only the  lower triangular part of  C
                                      is to be referenced.
               Unchanged on exit.

    TRANS

              TRANS is CHARACTER*1
               On entry,  TRANS  specifies the operation to be performed as
               follows:
                  TRANS = 'N' or 'n'   C := alpha*A*A**H + beta*C.
                  TRANS = 'C' or 'c'   C := alpha*A**H*A + beta*C.
               Unchanged on exit.

    N

              N is INTEGER
               On entry,  N specifies the order of the matrix C.  N must be
               at least zero.
               Unchanged on exit.

    K

              K is INTEGER
               On entry with  TRANS = 'N' or 'n',  K  specifies  the number
               of  columns   of  the   matrix   A,   and  on   entry   with
               TRANS = 'C' or 'c',  K  specifies  the number of rows of the
               matrix A.  K must be at least zero.
               Unchanged on exit.

    ALPHA

              ALPHA is REAL
               On entry, ALPHA specifies the scalar alpha.
               Unchanged on exit.

    A

              A is COMPLEX array, dimension (LDA,ka)
               where KA
               is K  when TRANS = 'N' or 'n', and is N otherwise. Before
               entry with TRANS = 'N' or 'n', the leading N--by--K part of
               the array A must contain the matrix A, otherwise the leading
               K--by--N part of the array A must contain the matrix A.
               Unchanged on exit.

    LDA

              LDA is INTEGER
               On entry, LDA specifies the first dimension of A as declared
               in  the  calling  (sub)  program.   When  TRANS = 'N' or 'n'
               then  LDA must be at least  max( 1, n ), otherwise  LDA must
               be at least  max( 1, k ).
               Unchanged on exit.

    BETA

              BETA is REAL
               On entry, BETA specifies the scalar beta.
               Unchanged on exit.

    C

              C is COMPLEX array, dimension (N*(N+1)/2)
               On entry, the matrix A in RFP Format. RFP Format is
               described by TRANSR, UPLO and N. Note that the imaginary
               parts of the diagonal elements need not be set, they are
               assumed to be zero, and on exit they are set to zero.

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 166 of file chfrk.f.

Author

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