[BACK]Return to dgebd2.f CVS log [TXT] [DIR] Up to [local] / rpl / lapack / lapack

Diff for /rpl/lapack/lapack/dgebd2.f between versions 1.7 and 1.8

version 1.7, 2010/12/21 13:53:24 version 1.8, 2011/07/22 07:38:04
Line 1 Line 1
       SUBROUTINE DGEBD2( M, N, A, LDA, D, E, TAUQ, TAUP, WORK, INFO )        SUBROUTINE DGEBD2( M, N, A, LDA, D, E, TAUQ, TAUP, 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
Line 17 Line 17
 *  =======  *  =======
 *  *
 *  DGEBD2 reduces a real general m by n matrix A to upper or lower  *  DGEBD2 reduces a real general m by n matrix A to upper or lower
 *  bidiagonal form B by an orthogonal transformation: Q' * A * P = B.  *  bidiagonal form B by an orthogonal transformation: Q**T * A * P = B.
 *  *
 *  If m >= n, B is upper bidiagonal; if m < n, B is lower bidiagonal.  *  If m >= n, B is upper bidiagonal; if m < n, B is lower bidiagonal.
 *  *
Line 87 Line 87
 *  *
 *  Each H(i) and G(i) has the form:  *  Each H(i) and G(i) has the form:
 *  *
 *     H(i) = I - tauq * v * v'  and G(i) = I - taup * u * u'  *     H(i) = I - tauq * v * v**T  and G(i) = I - taup * u * u**T
 *  *
 *  where tauq and taup are real scalars, and v and u are real vectors;  *  where tauq and taup are real scalars, and v and u are real vectors;
 *  v(1:i-1) = 0, v(i) = 1, and v(i+1:m) is stored on exit in A(i+1:m,i);  *  v(1:i-1) = 0, v(i) = 1, and v(i+1:m) is stored on exit in A(i+1:m,i);
Line 100 Line 100
 *  *
 *  Each H(i) and G(i) has the form:  *  Each H(i) and G(i) has the form:
 *  *
 *     H(i) = I - tauq * v * v'  and G(i) = I - taup * u * u'  *     H(i) = I - tauq * v * v**T  and G(i) = I - taup * u * u**T
 *  *
 *  where tauq and taup are real scalars, and v and u are real vectors;  *  where tauq and taup are real scalars, and v and u are real vectors;
 *  v(1:i) = 0, v(i+1) = 1, and v(i+2:m) is stored on exit in A(i+2:m,i);  *  v(1:i) = 0, v(i+1) = 1, and v(i+2:m) is stored on exit in A(i+2:m,i);
Removed from v.1.7  
changed lines
  Added in v.1.8

CVSweb interface <joel.bertrand@systella.fr>