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cgemm.f

Section: LAPACK (3)
Updated: Wed Oct 17 2018
Index 

NAME

cgemm.f -  

SYNOPSIS


 

Functions/Subroutines


subroutine CGEMM (TRANSA, TRANSB, M, N, K, ALPHA, A, LDA, B, LDB, BETA, C, LDC)
CGEMM  

Function/Subroutine Documentation

 

subroutine CGEMM (characterTRANSA, characterTRANSB, integerM, integerN, integerK, complexALPHA, complex, dimension(lda,*)A, integerLDA, complex, dimension(ldb,*)B, integerLDB, complexBETA, complex, dimension(ldc,*)C, integerLDC)

CGEMM Purpose:

 CGEMM  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   or   op( X ) = X**H, 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**H.


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**H.


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 COMPLEX           On entry, ALPHA specifies the scalar alpha.


A

          A is COMPLEX 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 COMPLEX 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 COMPLEX           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 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

Univ. of Colorado Denver

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 cgemm.f. 

Author

Generated automatically by Doxygen for LAPACK from the source code.


 

Index

NAME
SYNOPSIS
Functions/Subroutines
Function/Subroutine Documentation
subroutine CGEMM (characterTRANSA, characterTRANSB, integerM, integerN, integerK, complexALPHA, complex, dimension(lda,*)A, integerLDA, complex, dimension(ldb,*)B, integerLDB, complexBETA, complex, dimension(ldc,*)C, integerLDC)
Author

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