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sgemm (3)
  • >> sgemm (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         sgemm - perform one of the matrix-matrix operations    C  :=
         alpha*op( A )*op( B ) + beta*C
    
    SYNOPSIS
         SUBROUTINE SGEMM ( TRANSA, TRANSB, M, N, K, ALPHA,  A,  LDA,
                   B, LDB, BETA, C, LDC )
    
         CHARACTER*1 TRANSA, TRANSB
    
         INTEGER M, N, K, LDA, LDB, LDC
    
         REAL ALPHA, BETA
    
         REAL A( LDA, * ), B( LDB, * ), C( LDC, * )
    
    
    
         #include <sunperf.h>
    
         void sgemm(char transa, char transb, int m, int  n,  int  k,
                   float  alpha,  float  *sa, int lda, float *sb, int
                   ldb, float sbeta, float *sc, int ldc);
    
    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',
    
         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 - CHARACTER*1.  On entry, TRANSA specifies  the  form
         of  op(  A ) to be used in the matrix multiplication as fol-
         lows:
    
         TRANSA = 'N' or 'n',  op( A ) = A.
    
         TRANSA = 'T' or 't',  op( A ) = A'.
    
         TRANSA = 'C' or 'c',  op( A ) = A'.
    
         Unchanged on exit.
    
         TRANSB - CHARACTER*1.  On entry, TRANSB specifies  the  form
         of  op(  B ) to be used in the matrix multiplication as fol-
         lows:
    
         TRANSB = 'N' or 'n',  op( B ) = B.
    
         TRANSB = 'T' or 't',  op( B ) = B'.
    
         TRANSB = 'C' or 'c',  op( B ) = B'.
    
         Unchanged on exit.
    
         M         - 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.  Unchanged on exit.
    
         N         - 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.   Unchanged
                   on exit.
    
         K         - 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.
                   Unchanged on exit.
    
         ALPHA     - REAL.
                   On  entry,  ALPHA  specifies  the  scalar   alpha.
                   Unchanged on exit.
    
         A         - REAL array of DIMENSION ( LDA, ka ), where ka is
                   k  when  TRANSA = 'N' or 'n',  and is   m   other-
                   wise.   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.  Unchanged on exit.
    
         LDA       - 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 ).  Unchanged on exit.
    
         B         - REAL array of DIMENSION ( LDB, kb ), where kb is
                   n  when  TRANSB = 'N' or 'n',  and is   k   other-
                   wise.   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.  Unchanged on exit.
    
         LDB       - 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 ).  Unchanged on exit.
    
         BETA      - REAL.
                   On entry,  BETA  specifies the scalar  beta.  When
                   BETA   is  supplied as zero then C need not be set
                   on input.  Unchanged on exit.
    
         C         - 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       - 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  ).   Unchanged
                   on exit.
    
    
    
    


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