CSYMM(3)

💅 CSYMM(3) — Library Functions Manual 💅

okay bestie, welcome to the Library Functions Manual page for CSYMM. No cap, this is the entry for the source file /home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/BLAS/SRC/csymm.f, and it is giving full BLAS documentation energy. 💖

🎀 NAME 🎀

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/BLAS/SRC/csymm.f

✨ SYNOPSIS ✨

🦋 Functions/Subroutines 🦋

subroutine CSYMM (side, uplo, m, n, alpha, a, lda, b, ldb, beta, c, ldc)

and yes, the name is literally CSYMM. iconic behavior. 💅

🌈 Function/Subroutine Documentation 🌈

💖 subroutine CSYMM (...) 💖

subroutine CSYMM (character side, character uplo, integer m, integer n,
       complex alpha, complex, dimension(lda,*) a, integer lda, complex,
       dimension(ldb,*) b, integer ldb, complex beta, complex, dimension(ldc,*)
       c, integer ldc)

CSYMM

💅 Purpose 💅

Okay so here’s the whole vibe: CSYMM 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 a symmetric matrix and B and C are m by n matrices. That’s the main character energy of this routine, fr fr. ✨

🌸 Parameters 🌸

• SIDE — SIDE is CHARACTER*1. On entry, SIDE specifies whether the symmetric 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 symmetric matrix A is to be referenced as follows:
  • UPLO = 'U' or 'u' → Only the upper triangular part of the symmetric matrix is to be referenced.
  • UPLO = 'L' or 'l' → Only the lower triangular part of the symmetric 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. Zero is valid, bestie.
• N — N is INTEGER. On entry, N specifies the number of columns of the matrix C. N must be at least zero. Same energy: zero is valid.
• ALPHA — ALPHA is COMPLEX. On entry, ALPHA specifies the scalar alpha.
• A — A is COMPLEX array, 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 symmetric 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 symmetric 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 symmetric 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 symmetric 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 symmetric 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 symmetric matrix and the strictly upper triangular part of A is not referenced. Read that twice, bestie — the unreferenced triangle is literally not invited to the function.
• 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 array, 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. On entry, BETA specifies the scalar beta. When BETA is supplied as zero then C need not be set on input. That’s the “you can skip the C setup” moment, iykyk.
• C — C is COMPLEX 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 updated matrix. So yes, C gets replaced — do not expect the old C to survive, periodt.
• 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.

🔥 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 csymm.f.

💜 Author 💜

Generated automatically by Doxygen for LAPACK from the source code.

---

And that’s the whole page, bestie! Footer vibe check: source/version says LAPACK Version 3.12.0, and the footer path is /home/abui...SRC/csymm.f(3). The date mentioned on the page is 8-February-1989 in Further Details. No cap, that’s the full source/version/date situation. 💖🎀🦋