2. EL 9
  3. blas
  4. dnrm2(3)

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dnrm2.f(3) LAPACK dnrm2.f(3)

NAME

dnrm2.f

SYNOPSIS

Functions/Subroutines


double precision function dnrm2 (N, X, INCX)
DNRM2

Function/Subroutine Documentation

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 )

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 DX

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

November 2017

Further Details: 



  -- This version written on 25-October-1982.


     Modified on 14-October-1993 to inline the call to DLASSQ.


     Sven Hammarling, Nag Ltd.

Definition at line 76 of file dnrm2.f.

Author

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