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version 1.7, 2010/12/21 13:53:25
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version 1.8, 2011/07/22 07:38:04
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| SUBROUTINE DGEHD2( N, ILO, IHI, A, LDA, TAU, WORK, INFO ) |
SUBROUTINE DGEHD2( N, ILO, IHI, A, LDA, TAU, WORK, INFO ) |
| * |
* |
| * -- LAPACK routine (version 3.2) -- |
* -- LAPACK routine (version 3.3.1) -- |
| * -- LAPACK is a software package provided by Univ. of Tennessee, -- |
* -- LAPACK is a software package provided by Univ. of Tennessee, -- |
| * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- |
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- |
| * November 2006 |
* -- April 2011 -- |
| * |
* |
| * .. Scalar Arguments .. |
* .. Scalar Arguments .. |
| INTEGER IHI, ILO, INFO, LDA, N |
INTEGER IHI, ILO, INFO, LDA, N |
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| * ======= |
* ======= |
| * |
* |
| * DGEHD2 reduces a real general matrix A to upper Hessenberg form H by |
* DGEHD2 reduces a real general matrix A to upper Hessenberg form H by |
| * an orthogonal similarity transformation: Q' * A * Q = H . |
* an orthogonal similarity transformation: Q**T * A * Q = H . |
| * |
* |
| * Arguments |
* Arguments |
| * ========= |
* ========= |
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| * |
* |
| * Each H(i) has the form |
* Each H(i) has the form |
| * |
* |
| * H(i) = I - tau * v * v' |
* H(i) = I - tau * v * v**T |
| * |
* |
| * where tau is a real scalar, and v is a real vector with |
* where tau is a real scalar, and v is a real vector with |
| * v(1:i) = 0, v(i+1) = 1 and v(ihi+1:n) = 0; v(i+2:ihi) is stored on |
* v(1:i) = 0, v(i+1) = 1 and v(ihi+1:n) = 0; v(i+2:ihi) is stored on |
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