version 1.4, 2010/12/21 13:53:26
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version 1.5, 2011/07/22 07:38:05
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SUBROUTINE DGEQRFP( M, N, A, LDA, TAU, WORK, LWORK, INFO ) |
SUBROUTINE DGEQRFP( M, N, A, LDA, TAU, WORK, LWORK, INFO ) |
* |
* |
* -- LAPACK routine (version 3.2.2) -- |
* -- 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..-- |
* June 2010 |
* -- April 2011 -- |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
INTEGER INFO, LDA, LWORK, M, N |
INTEGER INFO, LDA, LWORK, M, N |
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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-1) = 0 and v(i) = 1; v(i+1:m) is stored on exit in A(i+1:m,i), |
* v(1:i-1) = 0 and v(i) = 1; v(i+1:m) is stored on exit in A(i+1:m,i), |
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CALL DLARFT( 'Forward', 'Columnwise', M-I+1, IB, |
CALL DLARFT( 'Forward', 'Columnwise', M-I+1, IB, |
$ A( I, I ), LDA, TAU( I ), WORK, LDWORK ) |
$ A( I, I ), LDA, TAU( I ), WORK, LDWORK ) |
* |
* |
* Apply H' to A(i:m,i+ib:n) from the left |
* Apply H**T to A(i:m,i+ib:n) from the left |
* |
* |
CALL DLARFB( 'Left', 'Transpose', 'Forward', |
CALL DLARFB( 'Left', 'Transpose', 'Forward', |
$ 'Columnwise', M-I+1, N-I-IB+1, IB, |
$ 'Columnwise', M-I+1, N-I-IB+1, IB, |