LAPACK 3.11.0
LAPACK: Linear Algebra PACKage

◆ 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.