BLAS/SRC/strmm.f(3)

✨ NAME ✨

okay so this page is BLAS/SRC/strmm.f, and we're reading it in the Library Functions Manual, bestie. It's the STRMM routine, and it's giving Level 3 BLAS energy. 💅

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🌸 SYNOPSIS 🌸

🧚 Functions/Subroutines 🧚

subroutine strmm (side, uplo, transa, diag, m, n, alpha, a, lda, b, ldb)
           STRMM

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🦋 Function/Subroutine Documentation 🦋

subroutine strmm (character side, character uplo, character transa,
     character diag, integer m, integer n, real alpha, real, dimension(lda,*)
     a, integer lda, real, dimension(ldb,*) b, integer ldb)

STRMM

✨ Purpose: ✨

okay bestie, here's the whole vibe: STRMM performs one of the matrix-matrix operations

B := alpha*op( A )*B,   or   B := alpha*B*op( A ),

where alpha is a scalar, B is an m by n matrix, A is a unit, or non-unit, upper or lower triangular matrix and op( A ) is one of

op( A ) = A   or   op( A ) = A**T.

🎀 Parameters 🎀

SIDE

SIDE is CHARACTER*1. On entry, SIDE specifies whether op( A ) multiplies B from the left or right as follows:

• SIDE = 'L' or 'l' — B := alpha*op( A )*B.
• SIDE = 'R' or 'r' — B := alpha*B*op( A ).

UPLO

UPLO is CHARACTER*1. On entry, UPLO specifies whether the matrix A is an upper or lower triangular matrix as follows:

• UPLO = 'U' or 'u' — A is an upper triangular matrix.
• UPLO = 'L' or 'l' — A is a lower triangular matrix.

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**T.

DIAG

DIAG is CHARACTER*1. On entry, DIAG specifies whether or not A is unit triangular as follows:

• DIAG = 'U' or 'u' — A is assumed to be unit triangular.
• DIAG = 'N' or 'n' — A is not assumed to be unit triangular.

M

M is INTEGER. On entry, M specifies the number of rows of B. M must be at least zero.

N

N is INTEGER. On entry, N specifies the number of columns of B. N must be at least zero.

ALPHA

ALPHA is REAL. On entry, ALPHA specifies the scalar alpha. When alpha is zero then A is not referenced and B need not be set before entry.

A

A is REAL array, dimension ( LDA, k ), where k is m when SIDE = 'L' or 'l' and is n when SIDE = 'R' or 'r'.

Before entry with UPLO = 'U' or 'u', the leading k by k upper triangular part of the array A must contain the upper triangular matrix and the strictly lower triangular part of A is not referenced.

Before entry with UPLO = 'L' or 'l', the leading k by k lower triangular part of the array A must contain the lower triangular matrix and the strictly upper triangular part of A is not referenced.

Note that when DIAG = 'U' or 'u', the diagonal elements of A are not referenced either, but are assumed to be unity.

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 ), when SIDE = 'R' or 'r' then LDA must be at least max( 1, n ).

B

B is REAL array, dimension ( LDB, N ). Before entry, the leading m by n part of the array B must contain the matrix B, and on exit is overwritten by the transformed matrix.

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 ).

👑 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 176 of file strmm.f.

💌 Author 💌

Generated automatically by Doxygen for LAPACK from the source code.

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that's the page, bestie — LAPACK Version 3.12.0, BLAS/SRC/strmm.f(3), generated automatically by Doxygen for LAPACK from the source code, with the 8-February-1989 origin story included. periodt. 💖