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

```sgemm.f(3)							      LAPACK								sgemm.f(3)

NAME
sgemm.f -

SYNOPSIS
Functions/Subroutines
subroutine sgemm (TRANSA, TRANSB, M, N, K, ALPHA, A, LDA, B, LDB, BETA, C, LDC)
SGEMM

Function/Subroutine Documentation
subroutine sgemm (characterTRANSA, characterTRANSB, integerM, integerN, integerK, realALPHA, real, dimension(lda,*)A, integerLDA, real,
dimension(ldb,*)B, integerLDB, realBETA, real, dimension(ldc,*)C, integerLDC)
SGEMM Purpose:

SGEMM  performs one of the matrix-matrix operations

C := alpha*op( A )*op( B ) + beta*C,

where  op( X ) is one of

op( X ) = X   or   op( X ) = X**T,

alpha and beta are scalars, and A, B and C are matrices, with op( A )
an m by k matrix,  op( B )	a  k by n matrix and  C an m by n matrix.

Parameters:
TRANSA

TRANSA is CHARACTER*1
On entry, TRANSA specifies the form of op( A ) to be used in
the matrix multiplication as follows:

TRANSA = 'N' or 'n',  op( A ) = A.

TRANSA = 'T' or 't',  op( A ) = A**T.

TRANSA = 'C' or 'c',  op( A ) = A**T.

TRANSB

TRANSB is CHARACTER*1
On entry, TRANSB specifies the form of op( B ) to be used in
the matrix multiplication as follows:

TRANSB = 'N' or 'n',  op( B ) = B.

TRANSB = 'T' or 't',  op( B ) = B**T.

TRANSB = 'C' or 'c',  op( B ) = B**T.

M

M is INTEGER
On entry,  M  specifies  the number  of rows  of the  matrix
op( A )  and 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
op( B ) and the number of columns of the matrix C. N must be
at least zero.

K

K is INTEGER
On entry,  K  specifies  the number of columns of the matrix
op( A ) and the number of rows of the matrix op( B ). K must
be at least  zero.

ALPHA

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

A

A is REAL array of DIMENSION ( LDA, ka ), where ka is
k  when  TRANSA = 'N' or 'n',  and is  m	otherwise.
Before entry with  TRANSA = 'N' or 'n',  the leading  m by k
part of the array  A  must contain the matrix  A,  otherwise
the leading  k by m  part of the array  A  must contain  the
matrix A.

LDA

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

B

B is REAL array of DIMENSION ( LDB, kb ), where kb is
n  when  TRANSB = 'N' or 'n',  and is  k	otherwise.
Before entry with  TRANSB = 'N' or 'n',  the leading  k by n
part of the array  B  must contain the matrix  B,  otherwise
the leading  n by k  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. When  TRANSB = 'N' or 'n' then
LDB must be at least  max( 1, k ), otherwise  LDB must be at
least  max( 1, n ).

BETA

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

C

C is REAL 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  matrix
( alpha*op( A )*op( B ) + beta*C ).

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 188 of file sgemm.f.

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