BLAS/SRC/dnrm2.f90(3)      Library Functions Manual      BLAS/SRC/dnrm2.f90(3)

NAME
       BLAS/SRC/dnrm2.f90

SYNOPSIS
   Functions/Subroutines
       real(wp) function dnrm2 (n, x, incx)
           DNRM2

Function/Subroutine Documentation
   real(wp) function dnrm2 (integer n, real(wp), dimension(*) x, integer incx)
       DNRM2

       Purpose:


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

               DNRM2 := sqrt( x'*x )

       Parameters
           N

                     N is INTEGER
                    number of elements in input vector(s)

           X

                     X is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) )

           INCX

                     INCX is INTEGER, storage spacing between elements of X
                     If INCX > 0, X(1+(i-1)*INCX) = x(i) for 1 <= i <= n
                     If INCX < 0, X(1-(n-i)*INCX) = x(i) for 1 <= i <= n
                     If INCX = 0, x isn't a vector so there is no need to call
                     this subroutine.  If you call it anyway, it will count x(1)
                     in the vector norm N times.

       Author
           Edward Anderson, Lockheed Martin

       Date
           August 2016

       Contributors:
           Weslley Pereira, University of Colorado Denver, USA

       Further Details:


             Anderson E. (2017)
             Algorithm 978: Safe Scaling in the Level 1 BLAS
             ACM Trans Math Softw 44:1--28
             https://doi.org/10.1145/3061665

             Blue, James L. (1978)
             A Portable Fortran Program to Find the Euclidean Norm of a Vector
             ACM Trans Math Softw 4:15--23
             https://doi.org/10.1145/355769.355771

       Definition at line 88 of file dnrm2.f90.

Author
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LAPACK                          Version 3.12.0           BLAS/SRC/dnrm2.f90(3)