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DLASSQRun Method

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

Namespace: DotNumerics.LinearAlgebra.CSLapack
Assembly: DWSIM.MathOps.DotNumerics (in DWSIM.MathOps.DotNumerics.dll) Version: 1.0.0.0 (1.0.0.0)
Syntax
Copy
public void Run(
	int N,
	double[] X,
	int offset_x,
	int INCX,
	ref double SCALE,
	ref double SUMSQ
)
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Parameters

N  Int32
(input) INTEGER The number of elements to be used from the vector X.
X  Double
(input) DOUBLE PRECISION array, dimension (N) The vector for which a scaled sum of squares is computed. x( i ) = X( 1 + ( i - 1 )*INCX ), 1 .LE. i .LE. n.
offset_x  Int32
 
INCX  Int32
(input) INTEGER The increment between successive values of the vector X. INCX .GT. 0.
SCALE  Double
and sumsq must be supplied in SCALE and SUMSQ and
SUMSQ  Double
(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.
See Also