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authorjofret2009-04-28 07:17:00 +0000
committerjofret2009-04-28 07:17:00 +0000
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Moving lapack to right place
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- SUBROUTINE ZLASSQ( N, X, INCX, SCALE, SUMSQ )
-*
-* -- LAPACK auxiliary routine (version 3.1) --
-* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
-* November 2006
-*
-* .. Scalar Arguments ..
- INTEGER INCX, N
- DOUBLE PRECISION SCALE, SUMSQ
-* ..
-* .. Array Arguments ..
- COMPLEX*16 X( * )
-* ..
-*
-* Purpose
-* =======
-*
-* ZLASSQ 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.
-*
-* Arguments
-* =========
-*
-* N (input) INTEGER
-* The number of elements to be used from the vector X.
-*
-* X (input) COMPLEX*16 array, dimension (N)
-* The vector x as described above.
-* 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 the value scl .
-*
-* SUMSQ (input/output) DOUBLE PRECISION
-* On entry, the value sumsq in the equation above.
-* On exit, SUMSQ is overwritten with the value ssq .
-*
-* =====================================================================
-*
-* .. Parameters ..
- DOUBLE PRECISION ZERO
- PARAMETER ( ZERO = 0.0D+0 )
-* ..
-* .. Local Scalars ..
- INTEGER IX
- DOUBLE PRECISION TEMP1
-* ..
-* .. Intrinsic Functions ..
- INTRINSIC ABS, DBLE, DIMAG
-* ..
-* .. Executable Statements ..
-*
- IF( N.GT.0 ) THEN
- DO 10 IX = 1, 1 + ( N-1 )*INCX, INCX
- IF( DBLE( X( IX ) ).NE.ZERO ) THEN
- TEMP1 = ABS( DBLE( X( IX ) ) )
- IF( SCALE.LT.TEMP1 ) THEN
- SUMSQ = 1 + SUMSQ*( SCALE / TEMP1 )**2
- SCALE = TEMP1
- ELSE
- SUMSQ = SUMSQ + ( TEMP1 / SCALE )**2
- END IF
- END IF
- IF( DIMAG( X( IX ) ).NE.ZERO ) THEN
- TEMP1 = ABS( DIMAG( X( IX ) ) )
- IF( SCALE.LT.TEMP1 ) THEN
- SUMSQ = 1 + SUMSQ*( SCALE / TEMP1 )**2
- SCALE = TEMP1
- ELSE
- SUMSQ = SUMSQ + ( TEMP1 / SCALE )**2
- END IF
- END IF
- 10 CONTINUE
- END IF
-*
- RETURN
-*
-* End of ZLASSQ
-*
- END