# zhemm.f(3) [centos man page]

```zhemm.f(3)							      LAPACK								zhemm.f(3)

NAME
zhemm.f -

SYNOPSIS
Functions/Subroutines
subroutine zhemm (SIDE, UPLO, M, N, ALPHA, A, LDA, B, LDB, BETA, C, LDC)
ZHEMM

Function/Subroutine Documentation
subroutine zhemm (characterSIDE, characterUPLO, integerM, integerN, complex*16ALPHA, complex*16, dimension(lda,*)A, integerLDA, complex*16,
dimension(ldb,*)B, integerLDB, complex*16BETA, complex*16, dimension(ldc,*)C, integerLDC)
ZHEMM Purpose:

ZHEMM  performs one of the matrix-matrix operations

C := alpha*A*B + beta*C,

or

C := alpha*B*A + beta*C,

where alpha and beta are scalars, A is an hermitian matrix and  B and
C are m by n matrices.

Parameters:
SIDE

SIDE is CHARACTER*1
On entry,  SIDE  specifies whether  the  hermitian matrix  A
appears on the  left or right  in the  operation as follows:

SIDE = 'L' or 'l'   C := alpha*A*B + beta*C,

SIDE = 'R' or 'r'   C := alpha*B*A + beta*C,

UPLO

UPLO is CHARACTER*1
On  entry,   UPLO  specifies  whether  the  upper  or  lower
triangular  part	of  the  hermitian  matrix   A	is  to	be
referenced as follows:

UPLO = 'U' or 'u'   Only the upper triangular part of the
hermitian matrix is to be referenced.

UPLO = 'L' or 'l'   Only the lower triangular part of the
hermitian matrix is to be referenced.

M

M is INTEGER
On entry,  M  specifies the number of rows of the matrix	C.
M  must be at least zero.

N

N is INTEGER
On entry, N specifies the number of columns of the matrix C.
N  must be at least zero.

ALPHA

ALPHA is COMPLEX*16
On entry, ALPHA specifies the scalar alpha.

A

A is COMPLEX*16 array of DIMENSION ( LDA, ka ), where ka is
m  when  SIDE = 'L' or 'l'  and is n  otherwise.
Before entry  with  SIDE = 'L' or 'l',  the  m by m  part of
the array  A  must contain the  hermitian matrix,  such that
when  UPLO = 'U' or 'u', the leading m by m 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,  and when	UPLO = 'L' or 'l',
the leading  m by m  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.
Before entry  with  SIDE = 'R' or 'r',  the  n by n  part of
the array  A  must contain the  hermitian matrix,  such that
when  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,  and when	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.
Note that the imaginary parts  of the diagonal elements need
not be set, they are assumed to be zero.

LDA

LDA is INTEGER
On entry, LDA specifies the first dimension of A as declared
in the  calling (sub) program. When  SIDE = 'L' or 'l'  then
LDA must be at least  max( 1, m ), otherwise  LDA must be at
least max( 1, n ).

B

B is COMPLEX*16 array of DIMENSION ( LDB, n ).
Before entry, the leading  m by n part of the array  B  must
contain the matrix B.

LDB

LDB is INTEGER
On entry, LDB specifies the first dimension of B as declared
in  the  calling	(sub)  program.   LDB  must  be  at  least
max( 1, m ).

BETA

BETA is COMPLEX*16
On entry,  BETA  specifies the scalar  beta.  When  BETA	is
supplied as zero then C need not be set on input.

C

C is COMPLEX*16 array of DIMENSION ( LDC, n ).
Before entry, the leading  m by n  part of the array  C must
contain the matrix  C,  except when  beta  is zero, in which
case C need not be set on entry.
On exit, the array  C  is overwritten by the  m by n updated
matrix.

LDC

LDC is INTEGER
On entry, LDC specifies the first dimension of C as declared
in  the  calling	(sub)  program.   LDC  must  be  at  least
max( 1, m ).

Author:
Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Date:
November 2011

Further Details:

Level 3 Blas routine.

-- Written on 8-February-1989.
Jack Dongarra, Argonne National Laboratory.
Iain Duff, AERE Harwell.
Jeremy Du Croz, Numerical Algorithms Group Ltd.
Sven Hammarling, Numerical Algorithms Group Ltd.

Definition at line 192 of file zhemm.f.

Author
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Version 3.4.2							  Tue Sep 25 2012							zhemm.f(3)```
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