LAPACK 3.12.0
LAPACK: Linear Algebra PACKage
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◆ dlarmm()

double precision function dlarmm ( double precision anorm,
double precision bnorm,
double precision cnorm )

DLARMM

Purpose:
!>
!> DLARMM returns a factor s in (0, 1] such that the linear updates
!>
!>    (s * C) - A * (s * B)  and  (s * C) - (s * A) * B
!>
!> cannot overflow, where A, B, and C are matrices of conforming
!> dimensions.
!>
!> This is an auxiliary routine so there is no argument checking.
!>
Parameters
[in]ANORM
!>          ANORM is DOUBLE PRECISION
!>          The infinity norm of A. ANORM >= 0.
!>          The number of rows of the matrix A.  M >= 0.
!>
[in]BNORM
!>          BNORM is DOUBLE PRECISION
!>          The infinity norm of B. BNORM >= 0.
!>
[in]CNORM
!>          CNORM is DOUBLE PRECISION
!>          The infinity norm of C. CNORM >= 0.
!>
References: C. C. Kjelgaard Mikkelsen and L. Karlsson, Blocked Algorithms for Robust Solution of Triangular Linear Systems. In: International Conference on Parallel Processing and Applied Mathematics, pages 68–78. Springer, 2017.