claqr1.f(3) LAPACK claqr1.f(3)[top]NAMEclaqr1.f-SYNOPSISFunctions/Subroutines subroutine claqr1 (N, H, LDH, S1, S2, V)CLAQR1sets a scalar multiple of the first column of the product of 2-by-2 or 3-by-3 matrix H and specified shifts.Function/Subroutine Documentation subroutine claqr1 (integerN, complex, dimension( ldh, * )H, integerLDH, complexS1, complexS2, complex, dimension( * )V)CLAQR1sets a scalar multiple of the first column of the product of 2-by-2 or 3-by-3 matrix H and specified shifts. Purpose: Given a 2-by-2 or 3-by-3 matrix H,CLAQR1sets v to a scalar multiple of the first column of the product (*) K = (H - s1*I)*(H - s2*I) scaling to avoid overflows and most underflows. This is useful for starting double implicit shift bulges in the QR algorithm. Parameters: N N is integer Order of the matrix H. N must be either 2 or 3. H H is COMPLEX array of dimension (LDH,N) The 2-by-2 or 3-by-3 matrix H in (*). LDH LDH is integer The leading dimension of H as declared in the calling procedure. LDH.GE.N S1 S1 is COMPLEX S2 S2 is COMPLEX S1 and S2 are the shifts defining K in (*) above. V V is COMPLEX array of dimension N A scalar multiple of the first column of the matrix K in (*). Author: Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd. Date: September 2012 Contributors: Karen Braman and Ralph Byers, Department of Mathematics, University of Kansas, USA Definition at line 108 of file claqr1.f.AuthorGenerated automatically by Doxygen for LAPACK from the source code.Version 3.4.2Tue Sep 25 2012 claqr1.f(3)

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