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man pages->IRIX man pages -> complib/dlassq (3)
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### Contents

```
DLASSQ(3F)							    DLASSQ(3F)

```

### NAME[Toc][Back]

```     DLASSQ - return the values	scl and	smsq such that	 ( scl**2 )*smsq = x(
1 )**2 +...+ x( n )**2 + (	scale**2 )*sumsq,
```

### SYNOPSIS[Toc][Back]

```     SUBROUTINE	DLASSQ(	N, X, INCX, SCALE, SUMSQ )

INTEGER	INCX, N

DOUBLE		PRECISION SCALE, SUMSQ

DOUBLE		PRECISION X( * )
```

### PURPOSE[Toc][Back]

```     DLASSQ  returns the values	 scl  and  smsq	 such that

where  x( i ) = X(	1 + ( i	- 1 )*INCX ). The value	of  sumsq  is assumed
to	be non-negative	and  scl  returns the value

scl = max( scale, abs( x( i ) )	).

scale and sumsq must be supplied in SCALE and SUMSQ and
scl and smsq are overwritten on SCALE and SUMSQ respectively.

The routine makes only one	pass through the vector	x.

```

### ARGUMENTS[Toc][Back]

```     N	     (input) INTEGER
The number	of elements to be used from the	vector X.

X	     (input) DOUBLE PRECISION
The vector	for which a scaled sum of squares is computed.	x( i )
= X( 1 + (	i - 1 )*INCX ),	1 <= i <= n.

INCX    (input) INTEGER
The increment between successive values of	the vector X.  INCX >
0.

SCALE   (input/output) DOUBLE PRECISION
On	entry, the value  scale	 in the	equation above.	 On exit,
SCALE is overwritten with	scl , the scaling factor for the sum
of	squares.

SUMSQ   (input/output) DOUBLE PRECISION
On	entry, the value  sumsq	 in the	equation above.	 On exit,
SUMSQ is overwritten with	smsq , the basic sum of	squares	from
which  scl	 has been factored out.
DLASSQ(3F)							    DLASSQ(3F)

```

### NAME[Toc][Back]

```     DLASSQ - return the values	scl and	smsq such that	 ( scl**2 )*smsq = x(
1 )**2 +...+ x( n )**2 + (	scale**2 )*sumsq,
```

### SYNOPSIS[Toc][Back]

```     SUBROUTINE	DLASSQ(	N, X, INCX, SCALE, SUMSQ )

INTEGER	INCX, N

DOUBLE		PRECISION SCALE, SUMSQ

DOUBLE		PRECISION X( * )
```

### PURPOSE[Toc][Back]

```     DLASSQ  returns the values	 scl  and  smsq	 such that

where  x( i ) = X(	1 + ( i	- 1 )*INCX ). The value	of  sumsq  is assumed
to	be non-negative	and  scl  returns the value

scl = max( scale, abs( x( i ) )	).

scale and sumsq must be supplied in SCALE and SUMSQ and
scl and smsq are overwritten on SCALE and SUMSQ respectively.

The routine makes only one	pass through the vector	x.

```

### ARGUMENTS[Toc][Back]

```     N	     (input) INTEGER
The number	of elements to be used from the	vector X.

X	     (input) DOUBLE PRECISION
The vector	for which a scaled sum of squares is computed.	x( i )
= X( 1 + (	i - 1 )*INCX ),	1 <= i <= n.

INCX    (input) INTEGER
The increment between successive values of	the vector X.  INCX >
0.

SCALE   (input/output) DOUBLE PRECISION
On	entry, the value  scale	 in the	equation above.	 On exit,
SCALE is overwritten with	scl , the scaling factor for the sum
of	squares.

SUMSQ   (input/output) DOUBLE PRECISION
On	entry, the value  sumsq	 in the	equation above.	 On exit,
SUMSQ is overwritten with	smsq , the basic sum of	squares	from
which  scl	 has been factored out.

PPPPaaaaggggeeee 1111```
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