cla_syrcond_x()

real function cla_syrcond_x	(	character	UPLO,
		integer	N,
		complex, dimension( lda, * )	A,
		integer	LDA,
		complex, dimension( ldaf, * )	AF,
		integer	LDAF,
		integer, dimension( * )	IPIV,
		complex, dimension( * )	X,
		integer	INFO,
		complex, dimension( * )	WORK,
		real, dimension( * )	RWORK
	)

CLA_SYRCOND_X computes the infinity norm condition number of op(A)*diag(x) for symmetric indefinite matrices.

Download CLA_SYRCOND_X + dependencies [TGZ] [ZIP] [TXT]

Purpose:

    CLA_SYRCOND_X Computes the infinity norm condition number of
    op(A) * diag(X) where X is a COMPLEX vector.

Parameters

[in]	UPLO	UPLO is CHARACTER*1 = 'U': Upper triangle of A is stored; = 'L': Lower triangle of A is stored.
[in]	N	N is INTEGER The number of linear equations, i.e., the order of the matrix A. N >= 0.
[in]	A	A is COMPLEX array, dimension (LDA,N) On entry, the N-by-N matrix A.
[in]	LDA	LDA is INTEGER The leading dimension of the array A. LDA >= max(1,N).
[in]	AF	AF is COMPLEX array, dimension (LDAF,N) The block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by CSYTRF.
[in]	LDAF	LDAF is INTEGER The leading dimension of the array AF. LDAF >= max(1,N).
[in]	IPIV	IPIV is INTEGER array, dimension (N) Details of the interchanges and the block structure of D as determined by CSYTRF.
[in]	X	X is COMPLEX array, dimension (N) The vector X in the formula op(A) * diag(X).
[out]	INFO	INFO is INTEGER = 0: Successful exit. i > 0: The ith argument is invalid.
[out]	WORK	WORK is COMPLEX array, dimension (2*N). Workspace.
[out]	RWORK	RWORK is REAL array, dimension (N). Workspace.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.