clarft.f.html

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      SUBROUTINE <a name="CLARFT.1"></a><a href="clarft.f.html#CLARFT.1">CLARFT</a>( DIRECT, STOREV, N, K, V, LDV, TAU, T, LDT )
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  -- LAPACK auxiliary routine (version 3.1) --
</span><span class="comment">*</span><span class="comment">     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
</span><span class="comment">*</span><span class="comment">     November 2006
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     .. Scalar Arguments ..
</span>      CHARACTER          DIRECT, STOREV
      INTEGER            K, LDT, LDV, N
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Array Arguments ..
</span>      COMPLEX            T( LDT, * ), TAU( * ), V( LDV, * )
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  Purpose
</span><span class="comment">*</span><span class="comment">  =======
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  <a name="CLARFT.18"></a><a href="clarft.f.html#CLARFT.1">CLARFT</a> forms the triangular factor T of a complex block reflector H
</span><span class="comment">*</span><span class="comment">  of order n, which is defined as a product of k elementary reflectors.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  If DIRECT = 'F', H = H(1) H(2) . . . H(k) and T is upper triangular;
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  If DIRECT = 'B', H = H(k) . . . H(2) H(1) and T is lower triangular.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  If STOREV = 'C', the vector which defines the elementary reflector
</span><span class="comment">*</span><span class="comment">  H(i) is stored in the i-th column of the array V, and
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     H  =  I - V * T * V'
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  If STOREV = 'R', the vector which defines the elementary reflector
</span><span class="comment">*</span><span class="comment">  H(i) is stored in the i-th row of the array V, and
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     H  =  I - V' * T * V
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  Arguments
</span><span class="comment">*</span><span class="comment">  =========
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  DIRECT  (input) CHARACTER*1
</span><span class="comment">*</span><span class="comment">          Specifies the order in which the elementary reflectors are
</span><span class="comment">*</span><span class="comment">          multiplied to form the block reflector:
</span><span class="comment">*</span><span class="comment">          = 'F': H = H(1) H(2) . . . H(k) (Forward)
</span><span class="comment">*</span><span class="comment">          = 'B': H = H(k) . . . H(2) H(1) (Backward)
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  STOREV  (input) CHARACTER*1
</span><span class="comment">*</span><span class="comment">          Specifies how the vectors which define the elementary
</span><span class="comment">*</span><span class="comment">          reflectors are stored (see also Further Details):
</span><span class="comment">*</span><span class="comment">          = 'C': columnwise
</span><span class="comment">*</span><span class="comment">          = 'R': rowwise
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  N       (input) INTEGER
</span><span class="comment">*</span><span class="comment">          The order of the block reflector H. N &gt;= 0.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  K       (input) INTEGER
</span><span class="comment">*</span><span class="comment">          The order of the triangular factor T (= the number of
</span><span class="comment">*</span><span class="comment">          elementary reflectors). K &gt;= 1.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  V       (input/output) COMPLEX array, dimension
</span><span class="comment">*</span><span class="comment">                               (LDV,K) if STOREV = 'C'
</span><span class="comment">*</span><span class="comment">                               (LDV,N) if STOREV = 'R'
</span><span class="comment">*</span><span class="comment">          The matrix V. See further details.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  LDV     (input) INTEGER
</span><span class="comment">*</span><span class="comment">          The leading dimension of the array V.
</span><span class="comment">*</span><span class="comment">          If STOREV = 'C', LDV &gt;= max(1,N); if STOREV = 'R', LDV &gt;= K.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  TAU     (input) COMPLEX array, dimension (K)
</span><span class="comment">*</span><span class="comment">          TAU(i) must contain the scalar factor of the elementary
</span><span class="comment">*</span><span class="comment">          reflector H(i).
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  T       (output) COMPLEX array, dimension (LDT,K)
</span><span class="comment">*</span><span class="comment">          The k by k triangular factor T of the block reflector.
</span><span class="comment">*</span><span class="comment">          If DIRECT = 'F', T is upper triangular; if DIRECT = 'B', T is
</span><span class="comment">*</span><span class="comment">          lower triangular. The rest of the array is not used.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  LDT     (input) INTEGER
</span><span class="comment">*</span><span class="comment">          The leading dimension of the array T. LDT &gt;= K.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  Further Details
</span><span class="comment">*</span><span class="comment">  ===============
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  The shape of the matrix V and the storage of the vectors which define
</span><span class="comment">*</span><span class="comment">  the H(i) is best illustrated by the following example with n = 5 and
</span><span class="comment">*</span><span class="comment">  k = 3. The elements equal to 1 are not stored; the corresponding
</span><span class="comment">*</span><span class="comment">  array elements are modified but restored on exit. The rest of the
</span><span class="comment">*</span><span class="comment">  array is not used.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  DIRECT = 'F' and STOREV = 'C':         DIRECT = 'F' and STOREV = 'R':
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">               V = (  1       )                 V = (  1 v1 v1 v1 v1 )
</span><span class="comment">*</span><span class="comment">                   ( v1  1    )                     (     1 v2 v2 v2 )
</span><span class="comment">*</span><span class="comment">                   ( v1 v2  1 )                     (        1 v3 v3 )
</span><span class="comment">*</span><span class="comment">                   ( v1 v2 v3 )
</span><span class="comment">*</span><span class="comment">                   ( v1 v2 v3 )
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  DIRECT = 'B' and STOREV = 'C':         DIRECT = 'B' and STOREV = 'R':
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">               V = ( v1 v2 v3 )                 V = ( v1 v1  1       )
</span><span class="comment">*</span><span class="comment">                   ( v1 v2 v3 )                     ( v2 v2 v2  1    )
</span><span class="comment">*</span><span class="comment">                   (  1 v2 v3 )                     ( v3 v3 v3 v3  1 )
</span><span class="comment">*</span><span class="comment">                   (     1 v3 )
</span><span class="comment">*</span><span class="comment">                   (        1 )
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  =====================================================================
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     .. Parameters ..
</span>      COMPLEX            ONE, ZERO
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