BLAS/SRC/chpmv.f(3)        Library Functions Manual        BLAS/SRC/chpmv.f(3)

NAME
       BLAS/SRC/chpmv.f

SYNOPSIS
   Functions/Subroutines
       subroutine chpmv (uplo, n, alpha, ap, x, incx, beta, y, incy)
           CHPMV

Function/Subroutine Documentation
   subroutine chpmv (character uplo, integer n, complex alpha, complex,
       dimension(*) ap, complex, dimension(*) x, integer incx, complex beta,
       complex, dimension(*) y, integer incy)
       CHPMV

       Purpose:


            CHPMV  performs the matrix-vector operation

               y := alpha*A*x + beta*y,

            where alpha and beta are scalars, x and y are n element vectors and
            A is an n by n hermitian matrix, supplied in packed form.

       Parameters
           UPLO

                     UPLO is CHARACTER*1
                      On entry, UPLO specifies whether the upper or lower
                      triangular part of the matrix A is supplied in the packed
                      array AP as follows:

                         UPLO = 'U' or 'u'   The upper triangular part of A is
                                             supplied in AP.

                         UPLO = 'L' or 'l'   The lower triangular part of A is
                                             supplied in AP.

           N

                     N is INTEGER
                      On entry, N specifies the order of the matrix A.
                      N must be at least zero.

           ALPHA

                     ALPHA is COMPLEX
                      On entry, ALPHA specifies the scalar alpha.

           AP

                     AP is COMPLEX array, dimension at least
                      ( ( n*( n + 1 ) )/2 ).
                      Before entry with UPLO = 'U' or 'u', the array AP must
                      contain the upper triangular part of the hermitian matrix
                      packed sequentially, column by column, so that AP( 1 )
                      contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 1, 2 )
                      and a( 2, 2 ) respectively, and so on.
                      Before entry with UPLO = 'L' or 'l', the array AP must
                      contain the lower triangular part of the hermitian matrix
                      packed sequentially, column by column, so that AP( 1 )
                      contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 2, 1 )
                      and a( 3, 1 ) respectively, and so on.
                      Note that the imaginary parts of the diagonal elements need
                      not be set and are assumed to be zero.

           X

                     X is COMPLEX array, dimension at least
                      ( 1 + ( n - 1 )*abs( INCX ) ).
                      Before entry, the incremented array X must contain the n
                      element vector x.

           INCX

                     INCX is INTEGER
                      On entry, INCX specifies the increment for the elements of
                      X. INCX must not be zero.

           BETA

                     BETA is COMPLEX
                      On entry, BETA specifies the scalar beta. When BETA is
                      supplied as zero then Y need not be set on input.

           Y

                     Y is COMPLEX array, dimension at least
                      ( 1 + ( n - 1 )*abs( INCY ) ).
                      Before entry, the incremented array Y must contain the n
                      element vector y. On exit, Y is overwritten by the updated
                      vector y.

           INCY

                     INCY is INTEGER
                      On entry, INCY specifies the increment for the elements of
                      Y. INCY must not be zero.

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Further Details:


             Level 2 Blas routine.
             The vector and matrix arguments are not referenced when N = 0, or M = 0

             -- Written on 22-October-1986.
                Jack Dongarra, Argonne National Lab.
                Jeremy Du Croz, Nag Central Office.
                Sven Hammarling, Nag Central Office.
                Richard Hanson, Sandia National Labs.

       Definition at line 148 of file chpmv.f.

Author
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LAPACK                          Version 3.12.0             BLAS/SRC/chpmv.f(3)