Provided by: libblas-doc_1.2.20110419-7_all 
NAME
CHER - perform the hermitian rank 1 operation A := alpha*x*conjg( x' ) + A,
SYNOPSIS
SUBROUTINE CHER ( UPLO, N, ALPHA, X, INCX, A, LDA )
REAL ALPHA
INTEGER INCX, LDA, N
CHARACTER*1 UPLO
COMPLEX A( LDA, * ), X( * )
PURPOSE
CHER performs the hermitian rank 1 operation
where alpha is a real scalar, x is an n element vector and A is an n by n hermitian matrix.
PARAMETERS
UPLO - CHARACTER*1.
On entry, UPLO specifies whether the upper or lower triangular part of the array A is to be
referenced as follows:
UPLO = 'U' or 'u' Only the upper triangular part of A is to be referenced.
UPLO = 'L' or 'l' Only the lower triangular part of A is to be referenced.
Unchanged on exit.
N - INTEGER.
On entry, N specifies the order of the matrix A. N must be at least zero. Unchanged on exit.
ALPHA - REAL .
On entry, ALPHA specifies the scalar alpha. Unchanged on exit.
X - COMPLEX array of dimension at least
( 1 + ( n - 1 )*abs( INCX ) ). Before entry, the incremented array X must contain the n element
vector x. Unchanged on exit.
INCX - INTEGER.
On entry, INCX specifies the increment for the elements of X. INCX must not be zero. Unchanged on
exit.
A - COMPLEX array of DIMENSION ( LDA, n ).
Before entry with UPLO = 'U' or 'u', the leading n by n upper triangular part of the array A must
contain the upper triangular part of the hermitian matrix and the strictly lower triangular part
of A is not referenced. On exit, the upper triangular part of the array A is overwritten by the
upper triangular part of the updated matrix. Before entry with UPLO = 'L' or 'l', the leading n
by n lower triangular part of the array A must contain the lower triangular part of the hermitian
matrix and the strictly upper triangular part of A is not referenced. On exit, the lower
triangular part of the array A is overwritten by the lower triangular part of the updated matrix.
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.
LDA - INTEGER.
On entry, LDA specifies the first dimension of A as declared in the calling (sub) program. LDA
must be at least max( 1, n ). Unchanged on exit.
Level 2 Blas routine.
-- 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.