DGEMM(3)

💖 DGEMM(3) 💖

okay so this is DGEMM(3), from the Library Functions Manual, and the header path is /home/abui...SRC/dgemm.f(3) — she's giving main character energy fr fr. 💅

---

🌸 NAME 🌸

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/BLAS/SRC/dgemm.f — yes bestie, that's the whole path, no cap. It's the BLAS DGEMM source file, and this page is literally all about her. ✨

---

🎀 SYNOPSIS 🎀

Functions/Subroutines

   subroutine DGEMM (transa, transb, m, n, k, alpha, a, lda, b, ldb, beta,
       c, ldc)
       DGEMM

---

✨ Function/Subroutine Documentation ✨

   subroutine DGEMM (character transa, character transb, integer m, integer n,
       integer k, double precision alpha, double precision, dimension(lda,*) a,
       integer lda, double precision, dimension(ldb,*) b, integer ldb, double
       precision beta, double precision, dimension(ldc,*) c, integer ldc)
       DGEMM

🦋 Purpose 🦋

okay so DGEMM 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,

and like, 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. literally the whole vibe. 💖

👑 Parameters 👑

• 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 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 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 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 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 is DOUBLE PRECISION. On entry, ALPHA specifies the scalar alpha.
• A is DOUBLE PRECISION array, 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 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 is DOUBLE PRECISION array, 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 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 is DOUBLE PRECISION. On entry, BETA specifies the scalar beta. When BETA is supplied as zero then C need not be set on input.
• C is DOUBLE PRECISION array, 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 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.

🧚 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 186 of file dgemm.f.

---

📝 Author 📝

Generated automatically by Doxygen for LAPACK from the source code.

---

okay bye bestie 🫶 this iconic page is from LAPACK Version 3.12.0, and the footer path vibe is /home/abui...SRC/dgemm.f(3) — periodt. 💅✨