LAPACK  3.7.0
LAPACK: Linear Algebra PACKage

§ dnrm2()

double precision function dnrm2 ( integer  N,
double precision, dimension(*)  X,
integer  INCX 
)

DNRM2

Purpose:
 DNRM2 returns the euclidean norm of a vector via the function
 name, so that

    DNRM2 := sqrt( x'*x )
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date
December 2016
Further Details:
  -- This version written on 25-October-1982.
     Modified on 14-October-1993 to inline the call to DLASSQ.
     Sven Hammarling, Nag Ltd.