```01:       DOUBLE PRECISION FUNCTION DZSUM1( N, CX, INCX )
02: *
03: *  -- LAPACK auxiliary routine (version 3.2) --
04: *  -- LAPACK is a software package provided by Univ. of Tennessee,    --
05: *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
06: *     November 2006
07: *
08: *     .. Scalar Arguments ..
09:       INTEGER            INCX, N
10: *     ..
11: *     .. Array Arguments ..
12:       COMPLEX*16         CX( * )
13: *     ..
14: *
15: *  Purpose
16: *  =======
17: *
18: *  DZSUM1 takes the sum of the absolute values of a complex
19: *  vector and returns a double precision result.
20: *
21: *  Based on DZASUM from the Level 1 BLAS.
22: *  The change is to use the 'genuine' absolute value.
23: *
24: *  Contributed by Nick Higham for use with ZLACON.
25: *
26: *  Arguments
27: *  =========
28: *
29: *  N       (input) INTEGER
30: *          The number of elements in the vector CX.
31: *
32: *  CX      (input) COMPLEX*16 array, dimension (N)
33: *          The vector whose elements will be summed.
34: *
35: *  INCX    (input) INTEGER
36: *          The spacing between successive values of CX.  INCX > 0.
37: *
38: *  =====================================================================
39: *
40: *     .. Local Scalars ..
41:       INTEGER            I, NINCX
42:       DOUBLE PRECISION   STEMP
43: *     ..
44: *     .. Intrinsic Functions ..
45:       INTRINSIC          ABS
46: *     ..
47: *     .. Executable Statements ..
48: *
49:       DZSUM1 = 0.0D0
50:       STEMP = 0.0D0
51:       IF( N.LE.0 )
52:      \$   RETURN
53:       IF( INCX.EQ.1 )
54:      \$   GO TO 20
55: *
56: *     CODE FOR INCREMENT NOT EQUAL TO 1
57: *
58:       NINCX = N*INCX
59:       DO 10 I = 1, NINCX, INCX
60: *
61: *        NEXT LINE MODIFIED.
62: *
63:          STEMP = STEMP + ABS( CX( I ) )
64:    10 CONTINUE
65:       DZSUM1 = STEMP
66:       RETURN
67: *
68: *     CODE FOR INCREMENT EQUAL TO 1
69: *
70:    20 CONTINUE
71:       DO 30 I = 1, N
72: *
73: *        NEXT LINE MODIFIED.
74: *
75:          STEMP = STEMP + ABS( CX( I ) )
76:    30 CONTINUE
77:       DZSUM1 = STEMP
78:       RETURN
79: *
80: *     End of DZSUM1
81: *
82:       END
83: ```