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120 lines
3.2 KiB
120 lines
3.2 KiB
2 years ago
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*> \brief \b ZLAIPD
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*
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* =========== DOCUMENTATION ===========
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*
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* Online html documentation available at
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* http://www.netlib.org/lapack/explore-html/
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*
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* Definition:
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* ===========
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*
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* SUBROUTINE ZLAIPD( N, A, INDA, VINDA )
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*
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* .. Scalar Arguments ..
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* INTEGER INDA, N, VINDA
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* ..
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* .. Array Arguments ..
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* COMPLEX*16 A( * )
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* ..
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*
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*
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*> \par Purpose:
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* =============
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*>
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*> \verbatim
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*>
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*> ZLAIPD sets the imaginary part of the diagonal elements of a complex
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*> matrix A to a large value. This is used to test LAPACK routines for
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*> complex Hermitian matrices, which are not supposed to access or use
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*> the imaginary parts of the diagonals.
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*> \endverbatim
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*
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* Arguments:
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* ==========
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*
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*> \param[in] N
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*> \verbatim
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*> N is INTEGER
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*> The number of diagonal elements of A.
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*> \endverbatim
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*>
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*> \param[in,out] A
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*> \verbatim
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*> A is COMPLEX*16 array, dimension
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*> (1+(N-1)*INDA+(N-2)*VINDA)
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*> On entry, the complex (Hermitian) matrix A.
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*> On exit, the imaginary parts of the diagonal elements are set
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*> to BIGNUM = EPS / SAFMIN, where EPS is the machine epsilon and
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*> SAFMIN is the safe minimum.
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*> \endverbatim
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*>
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*> \param[in] INDA
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*> \verbatim
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*> INDA is INTEGER
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*> The increment between A(1) and the next diagonal element of A.
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*> Typical values are
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*> = LDA+1: square matrices with leading dimension LDA
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*> = 2: packed upper triangular matrix, starting at A(1,1)
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*> = N: packed lower triangular matrix, starting at A(1,1)
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*> \endverbatim
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*>
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*> \param[in] VINDA
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*> \verbatim
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*> VINDA is INTEGER
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*> The change in the diagonal increment between columns of A.
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*> Typical values are
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*> = 0: no change, the row and column increments in A are fixed
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*> = 1: packed upper triangular matrix
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*> = -1: packed lower triangular matrix
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*> \endverbatim
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*
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* Authors:
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* ========
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*
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*> \author Univ. of Tennessee
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*> \author Univ. of California Berkeley
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*> \author Univ. of Colorado Denver
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*> \author NAG Ltd.
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*
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*> \ingroup complex16_lin
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*
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* =====================================================================
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SUBROUTINE ZLAIPD( N, A, INDA, VINDA )
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*
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* -- LAPACK test routine --
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* -- LAPACK is a software package provided by Univ. of Tennessee, --
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* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
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*
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* .. Scalar Arguments ..
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INTEGER INDA, N, VINDA
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* ..
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* .. Array Arguments ..
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COMPLEX*16 A( * )
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* ..
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*
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* =====================================================================
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*
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* .. Local Scalars ..
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INTEGER I, IA, IXA
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DOUBLE PRECISION BIGNUM
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* ..
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* .. External Functions ..
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DOUBLE PRECISION DLAMCH
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EXTERNAL DLAMCH
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* ..
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* .. Intrinsic Functions ..
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INTRINSIC DBLE, DCMPLX
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* ..
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* .. Executable Statements ..
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*
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BIGNUM = DLAMCH( 'Epsilon' ) / DLAMCH( 'Safe minimum' )
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IA = 1
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IXA = INDA
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DO 10 I = 1, N
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A( IA ) = DCMPLX( DBLE( A( IA ) ), BIGNUM )
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IA = IA + IXA
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IXA = IXA + VINDA
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10 CONTINUE
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RETURN
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END
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