DLASSQ - Online Linux Manual Page

Section : 1
Updated : November 2008
Source : LAPACK auxiliary routine (version 3.2)
Note : LAPACK auxiliary routine (version 3.2)
NAMEDLASSQ - returns the values scl and smsq such that ( scl**2 )*smsq = x( 1 )**2 +...+ x( n )**2 + ( scale**2 )*sumsq,
SYNOPSISSUBROUTINE DLASSQ(  N, X, INCX, SCALE, SUMSQ )  INTEGER INCX, N  DOUBLE PRECISION SCALE, SUMSQ  DOUBLE PRECISION X( * )
PURPOSEDLASSQ 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.
ARGUMENTSN (input) INTEGER  The number of elements to be used from the vector X. X (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 <= 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. 0
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