# scnrm2.f(3) [centos man page]

```scnrm2.f(3)							      LAPACK							       scnrm2.f(3)

NAME
scnrm2.f -

SYNOPSIS
Functions/Subroutines
REAL function scnrm2 (N, X, INCX)
SCNRM2

Function/Subroutine Documentation
REAL function scnrm2 (integerN, complex, dimension(*)X, integerINCX)
SCNRM2 Purpose:

SCNRM2 returns the euclidean norm of a vector via the function
name, so that

SCNRM2 := sqrt( x**H*x )

Author:
Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Date:
November 2011

Further Details:

-- This version written on 25-October-1982.
Modified on 14-October-1993 to inline the call to CLASSQ.
Sven Hammarling, Nag Ltd.

Definition at line 55 of file scnrm2.f.

Author
Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2							  Tue Sep 25 2012						       scnrm2.f(3)```

## Check Out this Related Man Page

```classq.f(3)							      LAPACK							       classq.f(3)

NAME
classq.f -

SYNOPSIS
Functions/Subroutines
subroutine classq (N, X, INCX, SCALE, SUMSQ)
CLASSQ

Function/Subroutine Documentation
subroutine classq (integerN, complex, dimension( * )X, integerINCX, realSCALE, realSUMSQ)
CLASSQ

Purpose:

CLASSQ returns the values scl and ssq such that

( scl**2 )*ssq = x( 1 )**2 +...+ x( n )**2 + ( scale**2 )*sumsq,

where x( i ) = abs( X( 1 + ( i - 1 )*INCX ) ). The value of sumsq is
assumed to be at least unity and the value of ssq will then satisfy

1.0 .le. ssq .le. ( sumsq + 2*n ).

scale is assumed to be non-negative and scl returns the value

scl = max( scale, abs( real( x( i ) ) ), abs( aimag( x( i ) ) ) ),
i

scale and sumsq must be supplied in SCALE and SUMSQ respectively.
SCALE and SUMSQ are overwritten by scl and ssq respectively.

The routine makes only one pass through the vector X.

Parameters:
N

N is INTEGER
The number of elements to be used from the vector X.

X

X is COMPLEX array, dimension (N)
The vector x as described above.
x( i )	= X( 1 + ( i - 1 )*INCX ), 1 <= i <= n.

INCX

INCX is INTEGER
The increment between successive values of the vector X.
INCX > 0.

SCALE

SCALE is REAL
On entry, the value  scale  in the equation above.
On exit, SCALE is overwritten with the value  scl .

SUMSQ

SUMSQ is REAL
On entry, the value  sumsq  in the equation above.
On exit, SUMSQ is overwritten with the value  ssq .

Author:
Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Date:
November 2011

Definition at line 107 of file classq.f.

Author
Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.1							  Sun May 26 2013						       classq.f(3)```
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