CLAQSB man page on Oracle

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claqsb.f(3)			    LAPACK			   claqsb.f(3)

       claqsb.f -

       subroutine claqsb (UPLO, N, KD, AB, LDAB, S, SCOND, AMAX, EQUED)
	   CLAQSB scales a symmetric/Hermitian band matrix, using scaling
	   factors computed by spbequ.

Function/Subroutine Documentation
   subroutine claqsb (characterUPLO, integerN, integerKD, complex, dimension(
       ldab, * )AB, integerLDAB, real, dimension( * )S, realSCOND, realAMAX,
       CLAQSB scales a symmetric/Hermitian band matrix, using scaling factors
       computed by spbequ.


	    CLAQSB equilibrates a symmetric band matrix A using the scaling
	    factors in the vector S.


		     UPLO is CHARACTER*1
		     Specifies whether the upper or lower triangular part of the
		     symmetric matrix A is stored.
		     = 'U':  Upper triangular
		     = 'L':  Lower triangular


		     N is INTEGER
		     The order of the matrix A.	 N >= 0.


		     KD is INTEGER
		     The number of super-diagonals of the matrix A if UPLO = 'U',
		     or the number of sub-diagonals if UPLO = 'L'.  KD >= 0.


		     AB is COMPLEX array, dimension (LDAB,N)
		     On entry, the upper or lower triangle of the symmetric band
		     matrix A, stored in the first KD+1 rows of the array.  The
		     j-th column of A is stored in the j-th column of the array AB
		     as follows:
		     if UPLO = 'U', AB(kd+1+i-j,j) = A(i,j) for max(1,j-kd)<=i<=j;
		     if UPLO = 'L', AB(1+i-j,j)	   = A(i,j) for j<=i<=min(n,j+kd).

		     On exit, if INFO = 0, the triangular factor U or L from the
		     Cholesky factorization A = U**H *U or A = L*L**H of the band
		     matrix A, in the same storage format as A.


		     LDAB is INTEGER
		     The leading dimension of the array AB.  LDAB >= KD+1.


		     S is REAL array, dimension (N)
		     The scale factors for A.


		     SCOND is REAL
		     Ratio of the smallest S(i) to the largest S(i).


		     AMAX is REAL
		     Absolute value of largest matrix entry.


		     Specifies whether or not equilibration was done.
		     = 'N':  No equilibration.
		     = 'Y':  Equilibration was done, i.e., A has been replaced by
			     diag(S) * A * diag(S).

       Internal Parameters:

	     THRESH is a threshold value used to decide if scaling should be done
	     based on the ratio of the scaling factors.	 If SCOND < THRESH,
	     scaling is done.

	     LARGE and SMALL are threshold values used to decide if scaling should
	     be done based on the absolute size of the largest matrix element.
	     If AMAX > LARGE or AMAX < SMALL, scaling is done.

	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

	   September 2012

       Definition at line 142 of file claqsb.f.

       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2			Tue Sep 25 2012			   claqsb.f(3)

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