Euclidean norm

SNRM2/DNRM2/SCNRM2/DZNRM2

Example Compute the Euclidean norm of the REAL*8 vector x, where x is a vector 10 elements long stored in a one-dimensional array X of dimension 20.

INTEGER*4

N,INCX

REAL*8

S,DNRM2,X(20)

N =

10

 

INCX = 1

 

S =

DNRM2 (N,X,INCX)

Chapter 2 Basic Vector Operations 109