Computes the infinity norm condition number of op(A)*diag(x) for general matrices.
call cla_gercond_x( trans, n, a, lda, af, ldaf, ipiv, x, info, work, rwork )
call zla_gercond_x( trans, n, a, lda, af, ldaf, ipiv, x, info, work, rwork )
The function computes the infinity norm condition number of
op(A) * diag(x)
where the x is a COMPLEX vector for cla_gercond_x and a DOUBLE COMPLEX vector for zla_gercond_x.
CHARACTER*1. Must be 'N' or 'T' or 'C'.
Specifies the form of the system of equations:
trans = 'N', the system has the form A*X = B (No transpose)
trans = 'T', the system has the form AT*X = B (Transpose)
trans = 'C', the system has the form AH*X = B (Conjugate Transpose = Transpose)
INTEGER. The number of linear equations, that is, the order of the matrix A; n ≥ 0.
- a, af, x, work
COMPLEX for cla_gercond_x
DOUBLE COMPLEX for zla_gercond_x
a(lda,*) contains the original general n-by-n matrix A.
af(ldaf,*) contains the factors L and U from the factorization
A=P*L*Uas returned by ?getrf.
x, DIMENSION n. The vector
xin the formula
op(A) * diag(x).
work is a workspace array of DIMENSION (2*n).
The second dimension of a and af must be at least
INTEGER. The leading dimension of the array a. lda ≥
INTEGER. The leading dimension of af. ldaf ≥
Array with DIMENSION n. The pivot indices from the factorization
A = P*L*Uas computed by ?getrf. Row i of the matrix was interchanged with row
REAL for cla_gercond_x
DOUBLE PRECISION for zla_gercond_x
Array rwork with DIMENSION n is a workspace.