C Library Functions  - dznrm2 (3)

NAME

dznrm2(3f) - [BLAS:SINGLE_BLAS_LEVEL1]

CONTENTS

Synopsis
Definition
Options
Authors
     Further Details
See Also

SYNOPSIS

double precision function dznrm2(n,x,incx)

      .. Scalar Arguments ..
      integer,intent(in) :: incx, n
      ..

DEFINITION

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

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

OPTIONS

    N

number of elements in input vector(s)

    X

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.

AUTHORS

o Edward Anderson, Lockheed Martin

 date:August 2016

\par 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

SEE ALSO

Online html documentation available at http://www.netlib.org/lapack/explore-html/


Nemo Release 3.1 dznrm2 (3) July 22, 2023
Generated by manServer 1.08 from 25257508-decd-4d29-a82a-7902adaf56ca using man macros.