LAPACK 3.12.0 LAPACK: Linear Algebra PACKage
Searching...
No Matches
claipd.f
Go to the documentation of this file.
1*> \brief \b CLAIPD
2*
3* =========== DOCUMENTATION ===========
4*
5* Online html documentation available at
6* http://www.netlib.org/lapack/explore-html/
7*
8* Definition:
9* ===========
10*
11* SUBROUTINE CLAIPD( N, A, INDA, VINDA )
12*
13* .. Scalar Arguments ..
14* INTEGER INDA, N, VINDA
15* ..
16* .. Array Arguments ..
17* COMPLEX A( * )
18* ..
19*
20*
21*> \par Purpose:
22* =============
23*>
24*> \verbatim
25*>
26*> CLAIPD sets the imaginary part of the diagonal elements of a complex
27*> matrix A to a large value. This is used to test LAPACK routines for
28*> complex Hermitian matrices, which are not supposed to access or use
29*> the imaginary parts of the diagonals.
30*> \endverbatim
31*
32* Arguments:
33* ==========
34*
35*> \param[in] N
36*> \verbatim
37*> N is INTEGER
38*> The number of diagonal elements of A.
39*> \endverbatim
40*>
41*> \param[in,out] A
42*> \verbatim
43*> A is COMPLEX array, dimension
44*> (1+(N-1)*INDA+(N-2)*VINDA)
45*> On entry, the complex (Hermitian) matrix A.
46*> On exit, the imaginary parts of the diagonal elements are set
47*> to BIGNUM = EPS / SAFMIN, where EPS is the machine epsilon and
48*> SAFMIN is the safe minimum.
49*> \endverbatim
50*>
51*> \param[in] INDA
52*> \verbatim
53*> INDA is INTEGER
54*> The increment between A(1) and the next diagonal element of A.
55*> Typical values are
56*> = LDA+1: square matrices with leading dimension LDA
57*> = 2: packed upper triangular matrix, starting at A(1,1)
58*> = N: packed lower triangular matrix, starting at A(1,1)
59*> \endverbatim
60*>
61*> \param[in] VINDA
62*> \verbatim
63*> VINDA is INTEGER
64*> The change in the diagonal increment between columns of A.
65*> Typical values are
66*> = 0: no change, the row and column increments in A are fixed
67*> = 1: packed upper triangular matrix
68*> = -1: packed lower triangular matrix
69*> \endverbatim
70*
71* Authors:
72* ========
73*
74*> \author Univ. of Tennessee
75*> \author Univ. of California Berkeley
76*> \author Univ. of Colorado Denver
77*> \author NAG Ltd.
78*
79*> \ingroup complex_lin
80*
81* =====================================================================
82 SUBROUTINE claipd( N, A, INDA, VINDA )
83*
84* -- LAPACK test routine --
85* -- LAPACK is a software package provided by Univ. of Tennessee, --
86* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
87*
88* .. Scalar Arguments ..
89 INTEGER INDA, N, VINDA
90* ..
91* .. Array Arguments ..
92 COMPLEX A( * )
93* ..
94*
95* =====================================================================
96*
97* .. Local Scalars ..
98 INTEGER I, IA, IXA
99 REAL BIGNUM
100* ..
101* .. External Functions ..
102 REAL SLAMCH
103 EXTERNAL slamch
104* ..
105* .. Intrinsic Functions ..
106 INTRINSIC cmplx, real
107* ..
108* .. Executable Statements ..
109*
110 bignum = slamch( 'Epsilon' ) / slamch( 'Safe minimum' )
111 ia = 1
112 ixa = inda
113 DO 10 i = 1, n
114 a( ia ) = cmplx( real( a( ia ) ), bignum )
115 ia = ia + ixa
116 ixa = ixa + vinda
117 10 CONTINUE
118 RETURN
119 END
subroutine claipd(n, a, inda, vinda)
CLAIPD
Definition claipd.f:83