 LAPACK 3.11.0 LAPACK: Linear Algebra PACKage
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## ◆ claipd()

 subroutine claipd ( integer N, complex, dimension( * ) A, integer INDA, integer VINDA )

CLAIPD

Purpose:
``` CLAIPD sets the imaginary part of the diagonal elements of a complex
matrix A to a large value.  This is used to test LAPACK routines for
complex Hermitian matrices, which are not supposed to access or use
the imaginary parts of the diagonals.```
Parameters
 [in] N ``` N is INTEGER The number of diagonal elements of A.``` [in,out] A ``` A is COMPLEX array, dimension (1+(N-1)*INDA+(N-2)*VINDA) On entry, the complex (Hermitian) matrix A. On exit, the imaginary parts of the diagonal elements are set to BIGNUM = EPS / SAFMIN, where EPS is the machine epsilon and SAFMIN is the safe minimum.``` [in] INDA ``` INDA is INTEGER The increment between A(1) and the next diagonal element of A. Typical values are = LDA+1: square matrices with leading dimension LDA = 2: packed upper triangular matrix, starting at A(1,1) = N: packed lower triangular matrix, starting at A(1,1)``` [in] VINDA ``` VINDA is INTEGER The change in the diagonal increment between columns of A. Typical values are = 0: no change, the row and column increments in A are fixed = 1: packed upper triangular matrix = -1: packed lower triangular matrix```

Definition at line 82 of file claipd.f.

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
real function slamch(CMACH)
SLAMCH
Definition: slamch.f:68
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