la_lapack::lassq Interface Reference

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Public Member Functions
pure subroutine	classq (n, x, incx, scl, sumsq)
	la_classq
pure subroutine	dlassq (n, x, incx, scl, sumsq)
	la_dlassq
	la_qlassq
pure subroutine	slassq (n, x, incx, scl, sumsq)
	la_slassq
	la_wlassq
pure subroutine	zlassq (n, x, incx, scl, sumsq)
	la_zlassq

Detailed Description

!

LASSQ: 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. scale and sumsq must be supplied in SCALE and SUMSQ and scl and smsq are overwritten on SCALE and SUMSQ respectively. If scale * sqrt( sumsq ) > tbig then we require: scale >= sqrt( TINY*EPS ) / sbig on entry, and if 0 < scale * sqrt( sumsq ) < tsml then we require: scale <= sqrt( HUGE ) / ssml on entry, where tbig – upper threshold for values whose square is representable; sbig – scaling constant for big numbers;

See also

la_constants.f90 tsml – lower threshold for values whose square is representable; ssml – scaling constant for small numbers;

la_constants.f90 and TINY*EPS – tiniest representable number; HUGE – biggest representable number.

Member Function/Subroutine Documentation

classq()

pure subroutine la_lapack::lassq::classq	(	integer(ilp), intent(in)	n,
		complex(sp), dimension(*), intent(in)	x,
		integer(ilp), intent(in)	incx,
		real(sp), intent(inout)	scl,
		real(sp), intent(inout)	sumsq
	)

dlassq()

pure subroutine la_lapack::lassq::dlassq	(	integer(ilp), intent(in)	n,
		real(dp), dimension(*), intent(in)	x,
		integer(ilp), intent(in)	incx,
		real(dp), intent(inout)	scl,
		real(dp), intent(inout)	sumsq
	)

la_classq()

la_lapack::lassq::la_classq

la_dlassq()

la_lapack::lassq::la_dlassq

la_qlassq()

la_lapack::lassq::la_qlassq

la_slassq()

la_lapack::lassq::la_slassq

la_wlassq()

la_lapack::lassq::la_wlassq

la_zlassq()

la_lapack::lassq::la_zlassq

slassq()

pure subroutine la_lapack::lassq::slassq	(	integer(ilp), intent(in)	n,
		real(sp), dimension(*), intent(in)	x,
		integer(ilp), intent(in)	incx,
		real(sp), intent(inout)	scl,
		real(sp), intent(inout)	sumsq
	)

zlassq()

pure subroutine la_lapack::lassq::zlassq	(	integer(ilp), intent(in)	n,
		complex(dp), dimension(*), intent(in)	x,
		integer(ilp), intent(in)	incx,
		real(dp), intent(inout)	scl,
		real(dp), intent(inout)	sumsq
	)

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The documentation for this interface was generated from the following file:

• la_lapack.f90