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    1: *> \brief \b ZTRTTP copies a triangular matrix from the standard full format (TR) to the standard packed format (TP).
    2: *
    3: *  =========== DOCUMENTATION ===========
    4: *
    5: * Online html documentation available at
    6: *            http://www.netlib.org/lapack/explore-html/
    7: *
    8: *> \htmlonly
    9: *> Download ZTRTTP + dependencies
   10: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/ztrttp.f">
   11: *> [TGZ]</a>
   12: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/ztrttp.f">
   13: *> [ZIP]</a>
   14: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/ztrttp.f">
   15: *> [TXT]</a>
   16: *> \endhtmlonly
   17: *
   18: *  Definition:
   19: *  ===========
   20: *
   21: *       SUBROUTINE ZTRTTP( UPLO, N, A, LDA, AP, INFO )
   22: *
   23: *       .. Scalar Arguments ..
   24: *       CHARACTER          UPLO
   25: *       INTEGER            INFO, N, LDA
   26: *       ..
   27: *       .. Array Arguments ..
   28: *       COMPLEX*16         A( LDA, * ), AP( * )
   29: *       ..
   30: *
   31: *
   32: *> \par Purpose:
   33: *  =============
   34: *>
   35: *> \verbatim
   36: *>
   37: *> ZTRTTP copies a triangular matrix A from full format (TR) to standard
   38: *> packed format (TP).
   39: *> \endverbatim
   40: *
   41: *  Arguments:
   42: *  ==========
   43: *
   44: *> \param[in] UPLO
   45: *> \verbatim
   46: *>          UPLO is CHARACTER*1
   47: *>          = 'U':  A is upper triangular;
   48: *>          = 'L':  A is lower triangular.
   49: *> \endverbatim
   50: *>
   51: *> \param[in] N
   52: *> \verbatim
   53: *>          N is INTEGER
   54: *>          The order of the matrices AP and A.  N >= 0.
   55: *> \endverbatim
   56: *>
   57: *> \param[in] A
   58: *> \verbatim
   59: *>          A is COMPLEX*16 array, dimension (LDA,N)
   60: *>          On entry, the triangular matrix A.  If UPLO = 'U', the leading
   61: *>          N-by-N upper triangular part of A contains the upper
   62: *>          triangular part of the matrix A, and the strictly lower
   63: *>          triangular part of A is not referenced.  If UPLO = 'L', the
   64: *>          leading N-by-N lower triangular part of A contains the lower
   65: *>          triangular part of the matrix A, and the strictly upper
   66: *>          triangular part of A is not referenced.
   67: *> \endverbatim
   68: *>
   69: *> \param[in] LDA
   70: *> \verbatim
   71: *>          LDA is INTEGER
   72: *>          The leading dimension of the array A.  LDA >= max(1,N).
   73: *> \endverbatim
   74: *>
   75: *> \param[out] AP
   76: *> \verbatim
   77: *>          AP is COMPLEX*16 array, dimension ( N*(N+1)/2 ),
   78: *>          On exit, the upper or lower triangular matrix A, packed
   79: *>          columnwise in a linear array. The j-th column of A is stored
   80: *>          in the array AP as follows:
   81: *>          if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j;
   82: *>          if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n.
   83: *> \endverbatim
   84: *>
   85: *> \param[out] INFO
   86: *> \verbatim
   87: *>          INFO is INTEGER
   88: *>          = 0:  successful exit
   89: *>          < 0:  if INFO = -i, the i-th argument had an illegal value
   90: *> \endverbatim
   91: *
   92: *  Authors:
   93: *  ========
   94: *
   95: *> \author Univ. of Tennessee
   96: *> \author Univ. of California Berkeley
   97: *> \author Univ. of Colorado Denver
   98: *> \author NAG Ltd.
   99: *
  100: *> \date December 2016
  101: *
  102: *> \ingroup complex16OTHERcomputational
  103: *
  104: *  =====================================================================
  105:       SUBROUTINE ZTRTTP( UPLO, N, A, LDA, AP, INFO )
  106: *
  107: *  -- LAPACK computational routine (version 3.7.0) --
  108: *  -- LAPACK is a software package provided by Univ. of Tennessee,    --
  109: *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
  110: *     December 2016
  111: *
  112: *     .. Scalar Arguments ..
  113:       CHARACTER          UPLO
  114:       INTEGER            INFO, N, LDA
  115: *     ..
  116: *     .. Array Arguments ..
  117:       COMPLEX*16         A( LDA, * ), AP( * )
  118: *     ..
  119: *
  120: *  =====================================================================
  121: *
  122: *     .. Parameters ..
  123: *     ..
  124: *     .. Local Scalars ..
  125:       LOGICAL            LOWER
  126:       INTEGER            I, J, K
  127: *     ..
  128: *     .. External Functions ..
  129:       LOGICAL            LSAME
  130:       EXTERNAL           LSAME
  131: *     ..
  132: *     .. External Subroutines ..
  133:       EXTERNAL           XERBLA
  134: *     ..
  135: *     .. Executable Statements ..
  136: *
  137: *     Test the input parameters.
  138: *
  139:       INFO = 0
  140:       LOWER = LSAME( UPLO, 'L' )
  141:       IF( .NOT.LOWER .AND. .NOT.LSAME( UPLO, 'U' ) ) THEN
  142:          INFO = -1
  143:       ELSE IF( N.LT.0 ) THEN
  144:          INFO = -2
  145:       ELSE IF( LDA.LT.MAX( 1, N ) ) THEN
  146:          INFO = -4
  147:       END IF
  148:       IF( INFO.NE.0 ) THEN
  149:          CALL XERBLA( 'ZTRTTP', -INFO )
  150:          RETURN
  151:       END IF
  152: *
  153:       IF( LOWER ) THEN
  154:          K = 0
  155:          DO J = 1, N
  156:             DO I = J, N
  157:                K = K + 1
  158:                AP( K ) = A( I, J )
  159:             END DO
  160:          END DO
  161:       ELSE
  162:          K = 0
  163:          DO J = 1, N
  164:             DO I = 1, J
  165:                K = K + 1
  166:                AP( K ) = A( I, J )
  167:             END DO
  168:          END DO
  169:       END IF
  170: *
  171: *
  172:       RETURN
  173: *
  174: *     End of ZTRTTP
  175: *
  176:       END