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Technical Reference: Base Operating System and Extensions, Volume 2

SNRM2, DNRM2, SCNRM2, or DZNRM2 Function

Purpose

Computes the Euclidean length of the N-vector stored in X() with storage increment INCX.

Library

BLAS Library (libblas.a)

FORTRAN Syntax


REAL FUNCTION SNRM2(N,X,INCX)
INTEGER INCX, N
REAL X(*)

DOUBLE PRECISION FUNCTION DNRM2(N,X,INCX)
INTEGER INCX,N
DOUBLE PRECISION X(*)

REAL FUNCTION SCNRM2(N,X,INCX)
INTEGER INCX,N
COMPLEX X(*)

DOUBLE PRECISION FUNCTION DZNRM2(N,X,INCX)
INTEGER INCX,N
COMPLEX*16 X(*)

Description

The SNRM2, DNRM2, SCNRM2, or DZNRM2 function returns the Euclidean norm of the N-vector stored in X() with storage increment INCX.

Parameters

N On entry, N specifies the number of elements in X and Y; unchanged on exit.
X Vector of dimension at least (1 + (N-1) * abs(INCX) ); unchanged on exit.
INCX On entry, INCX specifies the increment for the elements of X; INCX must be greater than 0; unchanged on exit.

Error Codes

For values of N <= 0, a value of 0 is returned.

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