Contents

• NAME
• SYNOPSIS
  • F95 INTERFACE
  • C INTERFACE
• PURPOSE
• ARGUMENTS

NAME

     dnrm2 - Return the Euclidian norm of a vector.

SYNOPSIS

     DOUBLE PRECISION FUNCTION DNRM2(N, X, INCX)

     INTEGER N, INCX
     DOUBLE PRECISION X(*)

     DOUBLE PRECISION FUNCTION DNRM2_64(N, X, INCX)

     INTEGER*8 N, INCX
     DOUBLE PRECISION X(*)

  F95 INTERFACE
     REAL(8) FUNCTION NRM2([N], X, [INCX])

     INTEGER :: N, INCX
     REAL(8), DIMENSION(:) :: X

     REAL(8) FUNCTION NRM2_64([N], X, [INCX])

     INTEGER(8) :: N, INCX
     REAL(8), DIMENSION(:) :: X

  C INTERFACE
     #include <sunperf.h>

     double dnrm2(int n, double *x, int incx);

     double dnrm2_64(long n, double *x, long incx);

PURPOSE

     dnrm2 Return the Euclidian norm of a vector x where x is  an
     n-vector.

ARGUMENTS

     N (input)
               On entry, N specifies the number  of  elements  in
               the  vector.   N must be at least one for the sub-
               routine to have any visible effect.  Unchanged  on
               exit.
     X (input)
               ( 1 + ( n - 1 )*abs( INCX  )  ).   On  entry,  the
               incremented  array  X  must  contain the vector x.
               Unchanged on exit.

     INCX (input)
               On entry, INCX specifies  the  increment  for  the
               elements  of X.  INCX must be positive.  Unchanged
               on exit.