```01:       SUBROUTINE CLAG2Z( M, N, SA, LDSA, A, LDA, INFO )
02: *
03: *  -- LAPACK PROTOTYPE auxiliary routine (version 3.1.2) --
04: *  -- LAPACK is a software package provided by Univ. of Tennessee,    --
05: *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
06: *     August 2007
07: *
08: *     ..
09: *     .. Scalar Arguments ..
10:       INTEGER            INFO, LDA, LDSA, M, N
11: *     ..
12: *     .. Array Arguments ..
13:       COMPLEX            SA( LDSA, * )
14:       COMPLEX*16         A( LDA, * )
15: *     ..
16: *
17: *  Purpose
18: *  =======
19: *
20: *  CLAG2Z converts a COMPLEX matrix, SA, to a COMPLEX*16 matrix, A.
21: *
22: *  Note that while it is possible to overflow while converting
23: *  from double to single, it is not possible to overflow when
24: *  converting from single to double.
25: *
26: *  This is an auxiliary routine so there is no argument checking.
27: *
28: *  Arguments
29: *  =========
30: *
31: *  M       (input) INTEGER
32: *          The number of lines of the matrix A.  M >= 0.
33: *
34: *  N       (input) INTEGER
35: *          The number of columns of the matrix A.  N >= 0.
36: *
37: *  SA      (input) COMPLEX array, dimension (LDSA,N)
38: *          On entry, the M-by-N coefficient matrix SA.
39: *
40: *  LDSA    (input) INTEGER
41: *          The leading dimension of the array SA.  LDSA >= max(1,M).
42: *
43: *  A       (output) COMPLEX*16 array, dimension (LDA,N)
44: *          On exit, the M-by-N coefficient matrix A.
45: *
46: *  LDA     (input) INTEGER
47: *          The leading dimension of the array A.  LDA >= max(1,M).
48: *
49: *  INFO    (output) INTEGER
50: *          = 0:  successful exit
51: *  =========
52: *
53: *     .. Local Scalars ..
54:       INTEGER            I, J
55: *     ..
56: *     .. Executable Statements ..
57: *
58:       INFO = 0
59:       DO 20 J = 1, N
60:          DO 10 I = 1, M
61:             A( I, J ) = SA( I, J )
62:    10    CONTINUE
63:    20 CONTINUE
64:       RETURN
65: *
66: *     End of CLAG2Z
67: *
68:       END
69: ```