SRC/zgesc2.f(3) | Library Functions Manual | SRC/zgesc2.f(3) |
NAME
SRC/zgesc2.f
SYNOPSIS
Functions/Subroutines
subroutine zgesc2 (n, a, lda, rhs, ipiv, jpiv, scale)
ZGESC2 solves a system of linear equations using the LU factorization
with complete pivoting computed by sgetc2.
Function/Subroutine Documentation
subroutine zgesc2 (integer n, complex*16, dimension( lda, * ) a, integer lda, complex*16, dimension( * ) rhs, integer, dimension( * ) ipiv, integer, dimension( * ) jpiv, double precision scale)
ZGESC2 solves a system of linear equations using the LU factorization with complete pivoting computed by sgetc2.
Purpose:
ZGESC2 solves a system of linear equations A * X = scale* RHS with a general N-by-N matrix A using the LU factorization with complete pivoting computed by ZGETC2.
Parameters
N
N is INTEGER The number of columns of the matrix A.
A
A is COMPLEX*16 array, dimension (LDA, N) On entry, the LU part of the factorization of the n-by-n matrix A computed by ZGETC2: A = P * L * U * Q
LDA
LDA is INTEGER The leading dimension of the array A. LDA >= max(1, N).
RHS
RHS is COMPLEX*16 array, dimension N. On entry, the right hand side vector b. On exit, the solution vector X.
IPIV
IPIV is INTEGER array, dimension (N). The pivot indices; for 1 <= i <= N, row i of the matrix has been interchanged with row IPIV(i).
JPIV
JPIV is INTEGER array, dimension (N). The pivot indices; for 1 <= j <= N, column j of the matrix has been interchanged with column JPIV(j).
SCALE
SCALE is DOUBLE PRECISION On exit, SCALE contains the scale factor. SCALE is chosen 0 <= SCALE <= 1 to prevent overflow in the solution.
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Contributors:
Bo Kagstrom and Peter Poromaa, Department of Computing
Science, Umea University, S-901 87 Umea, Sweden.
Definition at line 114 of file zgesc2.f.
Author
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