version 1.1.1.1, 2010/01/26 15:22:46
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version 1.9, 2011/07/22 07:38:05
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SUBROUTINE DGERQ2( M, N, A, LDA, TAU, WORK, INFO ) |
SUBROUTINE DGERQ2( M, N, 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 INFO, LDA, M, N |
INTEGER INFO, LDA, 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(n-k+i+1:n) = 0 and v(n-k+i) = 1; v(1:n-k+i-1) is stored on exit in |
* v(n-k+i+1:n) = 0 and v(n-k+i) = 1; v(1:n-k+i-1) is stored on exit in |
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DOUBLE PRECISION AII |
DOUBLE PRECISION AII |
* .. |
* .. |
* .. External Subroutines .. |
* .. External Subroutines .. |
EXTERNAL DLARF, DLARFP, XERBLA |
EXTERNAL DLARF, DLARFG, XERBLA |
* .. |
* .. |
* .. Intrinsic Functions .. |
* .. Intrinsic Functions .. |
INTRINSIC MAX, MIN |
INTRINSIC MAX, MIN |
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* Generate elementary reflector H(i) to annihilate |
* Generate elementary reflector H(i) to annihilate |
* A(m-k+i,1:n-k+i-1) |
* A(m-k+i,1:n-k+i-1) |
* |
* |
CALL DLARFP( N-K+I, A( M-K+I, N-K+I ), A( M-K+I, 1 ), LDA, |
CALL DLARFG( N-K+I, A( M-K+I, N-K+I ), A( M-K+I, 1 ), LDA, |
$ TAU( I ) ) |
$ TAU( I ) ) |
* |
* |
* Apply H(i) to A(1:m-k+i-1,1:n-k+i) from the right |
* Apply H(i) to A(1:m-k+i-1,1:n-k+i) from the right |