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zgetc2.f(3) LAPACK zgetc2.f(3)

zgetc2.f -


subroutine zgetc2 (N, A, LDA, IPIV, JPIV, INFO)
 
ZGETC2 computes the LU factorization with complete pivoting of the general n-by-n matrix.

ZGETC2 computes the LU factorization with complete pivoting of the general n-by-n matrix.
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.
Parameters:
N
          N is INTEGER
          The order of the matrix A. N >= 0.
A
          A is 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
          LDA is INTEGER
          The leading dimension of the array A.  LDA >= max(1, N).
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).
INFO
          INFO is 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.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2013
Contributors:
Bo Kagstrom and Peter Poromaa, Department of Computing Science, Umea University, S-901 87 Umea, Sweden.
Definition at line 112 of file zgetc2.f.

Generated automatically by Doxygen for LAPACK from the source code.
Sat Nov 16 2013 Version 3.4.2

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