--- rpl/lapack/lapack/zlahrd.f 2010/12/21 13:53:49 1.7 +++ rpl/lapack/lapack/zlahrd.f 2011/07/22 07:38:17 1.8 @@ -1,9 +1,9 @@ SUBROUTINE ZLAHRD( N, K, NB, A, LDA, TAU, T, LDT, Y, LDY ) * -* -- LAPACK auxiliary routine (version 3.2) -- +* -- LAPACK auxiliary routine (version 3.3.1) -- * -- LAPACK is a software package provided by Univ. of Tennessee, -- * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- -* November 2006 +* -- April 2011 -- * * .. Scalar Arguments .. INTEGER K, LDA, LDT, LDY, N, NB @@ -19,8 +19,8 @@ * ZLAHRD reduces the first NB columns of a complex general n-by-(n-k+1) * matrix A so that elements below the k-th subdiagonal are zero. The * reduction is performed by a unitary similarity transformation -* Q' * A * Q. The routine returns the matrices V and T which determine -* Q as a block reflector I - V*T*V', and also the matrix Y = A * V * T. +* Q**H * A * Q. The routine returns the matrices V and T which determine +* Q as a block reflector I - V*T*V**H, and also the matrix Y = A * V * T. * * This is an OBSOLETE auxiliary routine. * This routine will be 'deprecated' in a future release. @@ -76,7 +76,7 @@ * * Each H(i) has the form * -* H(i) = I - tau * v * v' +* H(i) = I - tau * v * v**H * * where tau is a complex scalar, and v is a complex vector with * v(1:i+k-1) = 0, v(i+k) = 1; v(i+k+1:n) is stored on exit in @@ -85,7 +85,7 @@ * The elements of the vectors v together form the (n-k+1)-by-nb matrix * V which is needed, with T and Y, to apply the transformation to the * unreduced part of the matrix, using an update of the form: -* A := (I - V*T*V') * (A - Y*V'). +* A := (I - V*T*V**H) * (A - Y*V**H). * * The contents of A on exit are illustrated by the following example * with n = 7, k = 3 and nb = 2: @@ -132,14 +132,14 @@ * * Update A(1:n,i) * -* Compute i-th column of A - Y * V' +* Compute i-th column of A - Y * V**H * CALL ZLACGV( I-1, A( K+I-1, 1 ), LDA ) CALL ZGEMV( 'No transpose', N, I-1, -ONE, Y, LDY, $ A( K+I-1, 1 ), LDA, ONE, A( 1, I ), 1 ) CALL ZLACGV( I-1, A( K+I-1, 1 ), LDA ) * -* Apply I - V * T' * V' to this column (call it b) from the +* Apply I - V * T**H * V**H to this column (call it b) from the * left, using the last column of T as workspace * * Let V = ( V1 ) and b = ( b1 ) (first I-1 rows) @@ -147,19 +147,19 @@ * * where V1 is unit lower triangular * -* w := V1' * b1 +* w := V1**H * b1 * CALL ZCOPY( I-1, A( K+1, I ), 1, T( 1, NB ), 1 ) CALL ZTRMV( 'Lower', 'Conjugate transpose', 'Unit', I-1, $ A( K+1, 1 ), LDA, T( 1, NB ), 1 ) * -* w := w + V2'*b2 +* w := w + V2**H *b2 * CALL ZGEMV( 'Conjugate transpose', N-K-I+1, I-1, ONE, $ A( K+I, 1 ), LDA, A( K+I, I ), 1, ONE, $ T( 1, NB ), 1 ) * -* w := T'*w +* w := T**H *w * CALL ZTRMV( 'Upper', 'Conjugate transpose', 'Non-unit', I-1, $ T, LDT, T( 1, NB ), 1 )