  Quick Navigator

 Search Site Miscellaneous Server Agreement Year 2038 Credits   zgetc2.f(3) LAPACK zgetc2.f(3)

zgetc2.f -

# SYNOPSIS

## Functions/Subroutines

subroutine zgetc2 (N, A, LDA, IPIV, JPIV, INFO)

ZGETC2 computes the LU factorization with complete pivoting of the general n-by-n matrix.

# Function/Subroutine Documentation

## subroutine zgetc2 (integerN, complex*16, dimension( lda, * )A, integerLDA, integer, dimension( * )IPIV, integer, dimension( * )JPIV, integerINFO)

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
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.

# Author

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

Search for    or go to Top of page |  Section 3 |  Main Index Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.