.TH CGEHD2 1 "November 2006" " LAPACK routine (version 3.1) " " LAPACK routine (version 3.1) " .SH NAME CGEHD2 - a complex general matrix A to upper Hessenberg form H by a unitary similarity transformation .SH SYNOPSIS .TP 19 SUBROUTINE CGEHD2( N, ILO, IHI, A, LDA, TAU, WORK, INFO ) .TP 19 .ti +4 INTEGER IHI, ILO, INFO, LDA, N .TP 19 .ti +4 COMPLEX A( LDA, * ), TAU( * ), WORK( * ) .SH PURPOSE CGEHD2 reduces a complex general matrix A to upper Hessenberg form H by a unitary similarity transformation: Q\(aq * A * Q = H . .SH ARGUMENTS .TP 8 N (input) INTEGER The order of the matrix A. N >= 0. .TP 8 ILO (input) INTEGER IHI (input) INTEGER It is assumed that A is already upper triangular in rows and columns 1:ILO-1 and IHI+1:N. ILO and IHI are normally set by a previous call to CGEBAL; otherwise they should be set to 1 and N respectively. See Further Details. .TP 8 A (input/output) COMPLEX array, dimension (LDA,N) On entry, the n by n general matrix to be reduced. On exit, the upper triangle and the first subdiagonal of A are overwritten with the upper Hessenberg matrix H, and the elements below the first subdiagonal, with the array TAU, represent the unitary matrix Q as a product of elementary reflectors. See Further Details. LDA (input) INTEGER The leading dimension of the array A. LDA >= max(1,N). .TP 8 TAU (output) COMPLEX array, dimension (N-1) The scalar factors of the elementary reflectors (see Further Details). .TP 8 WORK (workspace) COMPLEX array, dimension (N) .TP 8 INFO (output) INTEGER = 0: successful exit .br < 0: if INFO = -i, the i-th argument had an illegal value. .SH FURTHER DETAILS The matrix Q is represented as a product of (ihi-ilo) elementary reflectors .br Q = H(ilo) H(ilo+1) . . . H(ihi-1). .br Each H(i) has the form .br H(i) = I - tau * v * v\(aq .br where tau is a complex scalar, and v is a complex vector with v(1:i) = 0, v(i+1) = 1 and v(ihi+1:n) = 0; v(i+2:ihi) is stored on exit in A(i+2:ihi,i), and tau in TAU(i). .br The contents of A are illustrated by the following example, with n = 7, ilo = 2 and ihi = 6: .br on entry, on exit, .br ( a a a a a a a ) ( a a h h h h a ) ( a a a a a a ) ( a h h h h a ) ( a a a a a a ) ( h h h h h h ) ( a a a a a a ) ( v2 h h h h h ) ( a a a a a a ) ( v2 v3 h h h h ) ( a a a a a a ) ( v2 v3 v4 h h h ) ( a ) ( a ) where a denotes an element of the original matrix A, h denotes a modified element of the upper Hessenberg matrix H, and vi denotes an element of the vector defining H(i). .br