Home Man
Search
Today's Posts
Register

Linux & Unix Commands - Search Man Pages

RedHat 9 (Linux i386) - man page for zgetc2 (redhat section l)

ZGETC2(l)						  )						    ZGETC2(l)

NAME
ZGETC2 - compute an LU factorization, using complete pivoting, of the n-by-n matrix A
SYNOPSIS
SUBROUTINE ZGETC2( N, A, LDA, IPIV, JPIV, INFO ) INTEGER INFO, LDA, N INTEGER IPIV( * ), JPIV( * ) COMPLEX*16 A( LDA, * )
PURPOSE
ZGETC2 computes an LU factorization, using complete pivoting, of the n-by-n matrix A. The factorization has the form A = P * L * U * Q, where P and Q are permutation matrices, L is lower triangular with unit diagonal elements and U is upper triangular. This is a level 1 BLAS version of the algorithm.
ARGUMENTS
N (input) INTEGER The order of the matrix A. N >= 0. A (input/output) COMPLEX*16 array, dimension (LDA, N) On entry, the n-by-n matrix to be factored. On exit, the factors L and U from the factorization A = P*L*U*Q; the unit diagonal elements of L are not stored. If U(k, k) appears to be less than SMIN, U(k, k) is given the value of SMIN, giving a nonsingular perturbed system. LDA (input) INTEGER The leading dimension of the array A. LDA >= max(1, N). IPIV (output) INTEGER array, dimension (N). The pivot indices; for 1 <= i <= N, row i of the matrix has been interchanged with row IPIV(i). JPIV (output) INTEGER array, dimension (N). The pivot indices; for 1 <= j <= N, column j of the matrix has been interchanged with column JPIV(j). INFO (output) INTEGER = 0: successful exit > 0: if INFO = k, U(k, k) is likely to produce overflow if one tries to solve for x in Ax = b. So U is perturbed to avoid the overflow.
FURTHER DETAILS
Based on contributions by Bo Kagstrom and Peter Poromaa, Department of Computing Science, Umea University, S-901 87 Umea, Sweden. LAPACK version 3.0 15 June 2000 ZGETC2(l)


All times are GMT -4. The time now is 01:02 AM.

Unix & Linux Forums Content Copyrightę1993-2018. All Rights Reserved.
UNIX.COM Login
Username:
Password:  
Show Password