DSYMV(3)

💖 DSYMV(3) — Library Functions Manual 💖

okay so bestie, we're in the Library Functions Manual for DSYMV(3), and this is gonna be cute and accurate. every parameter, path, and tiny detail is staying. periodt. 🫶

🌸 NAME 🌸

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

that's the whole NAME section, no cap. 🎀

✨ SYNOPSIS ✨

🧚 Functions/Subroutines 🧚

       subroutine DSYMV (uplo, n, alpha, a, lda, x, incx, beta, y, incy)
           DSYMV

🦋 Function/Subroutine Documentation 🦋

       subroutine DSYMV (character uplo, integer n, double precision alpha, double
       precision, dimension(lda,*) a, integer lda, double precision,
       dimension(*) x, integer incx, double precision beta, double precision,
       dimension(*) y, integer incy)
           DSYMV

🎯 Purpose 🎯

okay so DSYMV performs the matrix-vector operation:

y := alpha*A*x + beta*y,

where alpha and beta are scalars, x and y are n element vectors, and A is an n by n symmetric matrix. slay. 💅

🧸 Parameters 🧸

🌈 UPLO 🌈

UPLO is CHARACTER*1. On entry, UPLO specifies whether the upper or lower triangular part of the array A is to be referenced, like this:

• UPLO = 'U' or 'u' — only the upper triangular part of A is to be referenced.
• UPLO = 'L' or 'l' — only the lower triangular part of A is to be referenced.

⭐ N ⭐

N is INTEGER. On entry, N specifies the order of the matrix A. N must be at least zero. ✨

💖 ALPHA 💖

ALPHA is DOUBLE PRECISION. On entry, ALPHA specifies the scalar alpha. 🫶

🦋 A 🦋

A is DOUBLE PRECISION array, dimension ( LDA, N ).

Before entry with 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.

Before entry with 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.

👑 LDA 👑

LDA is INTEGER. On entry, LDA specifies the first dimension of A as declared in the calling (sub) program. LDA must be at least max( 1, n ). 👑

🍓 X 🍓

X is DOUBLE PRECISION array, dimension at least ( 1 + ( n - 1 )*abs( INCX ) ).

Before entry, the incremented array X must contain the n element vector x. 🍓

🚨 INCX 🚨

INCX is INTEGER. On entry, INCX specifies the increment for the elements of X. INCX must not be zero. 💀

💜 BETA 💜

BETA is DOUBLE PRECISION. On entry, BETA specifies the scalar beta. When BETA is supplied as zero then Y need not be set on input. 😭

🌸 Y 🌸

Y is DOUBLE PRECISION array, dimension at least ( 1 + ( n - 1 )*abs( INCY ) ).

Before entry, the incremented array Y must contain the n element vector y. On exit, Y is overwritten by the updated vector y. 🌸

💅 INCY 💅

INCY is INTEGER. On entry, INCY specifies the increment for the elements of Y. INCY must not be zero. 💅

👑 Author 👑

• Univ. of Tennessee
• Univ. of California Berkeley
• Univ. of Colorado Denver
• NAG Ltd.

🔥 Further Details 🔥

• Level 2 Blas routine.
• The vector and matrix arguments are not referenced when N = 0, or M = 0.
• -- Written on 22-October-1986.
  • Jack Dongarra, Argonne National Lab.
  • Jeremy Du Croz, Nag Central Office.
  • Sven Hammarling, Nag Central Office.
  • Richard Hanson, Sandia National Labs.

Definition at line 151 of file dsymv.f.

👑 Author 👑

Generated automatically by Doxygen for LAPACK from the source code.

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and that's the whole vibe! this page is for LAPACK Version 3.12.0, from /home/abui...SRC/dsymv.f(3). stay slay, bestie. 🎀✨