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Annotation of rpl/lapack/lapack/zlag2c.f, revision 1.9

1.9     ! bertrand    1: *> \brief \b ZLAG2C
        !             2: *
        !             3: *  =========== DOCUMENTATION ===========
        !             4: *
        !             5: * Online html documentation available at 
        !             6: *            http://www.netlib.org/lapack/explore-html/ 
        !             7: *
        !             8: *> \htmlonly
        !             9: *> Download ZLAG2C + dependencies 
        !            10: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/zlag2c.f"> 
        !            11: *> [TGZ]</a> 
        !            12: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/zlag2c.f"> 
        !            13: *> [ZIP]</a> 
        !            14: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/zlag2c.f"> 
        !            15: *> [TXT]</a>
        !            16: *> \endhtmlonly 
        !            17: *
        !            18: *  Definition:
        !            19: *  ===========
        !            20: *
        !            21: *       SUBROUTINE ZLAG2C( M, N, A, LDA, SA, LDSA, INFO )
        !            22: * 
        !            23: *       .. Scalar Arguments ..
        !            24: *       INTEGER            INFO, LDA, LDSA, M, N
        !            25: *       ..
        !            26: *       .. Array Arguments ..
        !            27: *       COMPLEX            SA( LDSA, * )
        !            28: *       COMPLEX*16         A( LDA, * )
        !            29: *       ..
        !            30: *  
        !            31: *
        !            32: *> \par Purpose:
        !            33: *  =============
        !            34: *>
        !            35: *> \verbatim
        !            36: *>
        !            37: *> ZLAG2C converts a COMPLEX*16 matrix, SA, to a COMPLEX matrix, A.
        !            38: *>
        !            39: *> RMAX is the overflow for the SINGLE PRECISION arithmetic
        !            40: *> ZLAG2C checks that all the entries of A are between -RMAX and
        !            41: *> RMAX. If not the convertion is aborted and a flag is raised.
        !            42: *>
        !            43: *> This is an auxiliary routine so there is no argument checking.
        !            44: *> \endverbatim
        !            45: *
        !            46: *  Arguments:
        !            47: *  ==========
        !            48: *
        !            49: *> \param[in] M
        !            50: *> \verbatim
        !            51: *>          M is INTEGER
        !            52: *>          The number of lines of the matrix A.  M >= 0.
        !            53: *> \endverbatim
        !            54: *>
        !            55: *> \param[in] N
        !            56: *> \verbatim
        !            57: *>          N is INTEGER
        !            58: *>          The number of columns of the matrix A.  N >= 0.
        !            59: *> \endverbatim
        !            60: *>
        !            61: *> \param[in] A
        !            62: *> \verbatim
        !            63: *>          A is COMPLEX*16 array, dimension (LDA,N)
        !            64: *>          On entry, the M-by-N coefficient matrix A.
        !            65: *> \endverbatim
        !            66: *>
        !            67: *> \param[in] LDA
        !            68: *> \verbatim
        !            69: *>          LDA is INTEGER
        !            70: *>          The leading dimension of the array A.  LDA >= max(1,M).
        !            71: *> \endverbatim
        !            72: *>
        !            73: *> \param[out] SA
        !            74: *> \verbatim
        !            75: *>          SA is COMPLEX array, dimension (LDSA,N)
        !            76: *>          On exit, if INFO=0, the M-by-N coefficient matrix SA; if
        !            77: *>          INFO>0, the content of SA is unspecified.
        !            78: *> \endverbatim
        !            79: *>
        !            80: *> \param[in] LDSA
        !            81: *> \verbatim
        !            82: *>          LDSA is INTEGER
        !            83: *>          The leading dimension of the array SA.  LDSA >= max(1,M).
        !            84: *> \endverbatim
        !            85: *>
        !            86: *> \param[out] INFO
        !            87: *> \verbatim
        !            88: *>          INFO is INTEGER
        !            89: *>          = 0:  successful exit.
        !            90: *>          = 1:  an entry of the matrix A is greater than the SINGLE
        !            91: *>                PRECISION overflow threshold, in this case, the content
        !            92: *>                of SA in exit is unspecified.
        !            93: *> \endverbatim
        !            94: *
        !            95: *  Authors:
        !            96: *  ========
        !            97: *
        !            98: *> \author Univ. of Tennessee 
        !            99: *> \author Univ. of California Berkeley 
        !           100: *> \author Univ. of Colorado Denver 
        !           101: *> \author NAG Ltd. 
        !           102: *
        !           103: *> \date November 2011
        !           104: *
        !           105: *> \ingroup complex16OTHERauxiliary
        !           106: *
        !           107: *  =====================================================================
1.1       bertrand  108:       SUBROUTINE ZLAG2C( M, N, A, LDA, SA, LDSA, INFO )
                    109: *
1.9     ! bertrand  110: *  -- LAPACK auxiliary routine (version 3.4.0) --
1.1       bertrand  111: *  -- LAPACK is a software package provided by Univ. of Tennessee,    --
                    112: *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
1.9     ! bertrand  113: *     November 2011
1.1       bertrand  114: *
                    115: *     .. Scalar Arguments ..
                    116:       INTEGER            INFO, LDA, LDSA, M, N
                    117: *     ..
                    118: *     .. Array Arguments ..
                    119:       COMPLEX            SA( LDSA, * )
                    120:       COMPLEX*16         A( LDA, * )
                    121: *     ..
                    122: *
1.8       bertrand  123: *  =====================================================================
1.1       bertrand  124: *
                    125: *     .. Local Scalars ..
                    126:       INTEGER            I, J
                    127:       DOUBLE PRECISION   RMAX
                    128: *     ..
                    129: *     .. Intrinsic Functions ..
                    130:       INTRINSIC          DBLE, DIMAG
                    131: *     ..
                    132: *     .. External Functions ..
                    133:       REAL               SLAMCH
                    134:       EXTERNAL           SLAMCH
                    135: *     ..
                    136: *     .. Executable Statements ..
                    137: *
                    138:       RMAX = SLAMCH( 'O' )
                    139:       DO 20 J = 1, N
                    140:          DO 10 I = 1, M
                    141:             IF( ( DBLE( A( I, J ) ).LT.-RMAX ) .OR.
1.8       bertrand  142:      $          ( DBLE( A( I, J ) ).GT.RMAX ) .OR.
                    143:      $          ( DIMAG( A( I, J ) ).LT.-RMAX ) .OR.
                    144:      $          ( DIMAG( A( I, J ) ).GT.RMAX ) ) THEN
1.1       bertrand  145:                INFO = 1
                    146:                GO TO 30
                    147:             END IF
                    148:             SA( I, J ) = A( I, J )
                    149:    10    CONTINUE
                    150:    20 CONTINUE
                    151:       INFO = 0
                    152:    30 CONTINUE
                    153:       RETURN
                    154: *
                    155: *     End of ZLAG2C
                    156: *
                    157:       END