BLAS/SRC/dznrm2.f90(3)     Library Functions Manual     BLAS/SRC/dznrm2.f90(3)

NAME
       BLAS/SRC/dznrm2.f90

SYNOPSIS
   Functions/Subroutines
       real(wp) function dznrm2 (n, x, incx)
           DZNRM2

Function/Subroutine Documentation
   real(wp) function dznrm2 (integer n, complex(wp), dimension(*) x, integer
       incx)
       DZNRM2

       Purpose:


            DZNRM2 returns the euclidean norm of a vector via the function
            name, so that

               DZNRM2 := sqrt( x**H*x )

       Parameters
           N

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

           X

                     X is COMPLEX*16 array, dimension (N)
                    complex vector with N elements

           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 89 of file dznrm2.f90.

Author
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LAPACK                          Version 3.12.0          BLAS/SRC/dznrm2.f90(3)