Return to ztrttp.f CVS log

Up to [local] / rpl / lapack / lapack

Annotation of rpl/lapack/lapack/ztrttp.f, revision 1.6

1.6     ! bertrand    1: *> \brief \b ZTRTTP
        !             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. 
1.1       bertrand   99: *
1.6     ! bertrand  100: *> \date November 2011
1.1       bertrand  101: *
1.6     ! bertrand  102: *> \ingroup complex16OTHERcomputational
1.1       bertrand  103: *
1.6     ! bertrand  104: *  =====================================================================
        !           105:       SUBROUTINE ZTRTTP( UPLO, N, A, LDA, AP, INFO )
        !           106: *
        !           107: *  -- LAPACK computational routine (version 3.4.0) --
1.1       bertrand  108: *  -- LAPACK is a software package provided by Univ. of Tennessee,    --
                    109: *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
1.6     ! bertrand  110: *     November 2011
1.1       bertrand  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