---
name: "zgetc2.f"
section: "3"
platform: "linux"
package: "lapack-doc"
version: "3.12.1-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/zgetc2.f"
---

# zgetc2.f(3)

## NAME

SRC/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 (integer n, complex\*16, dimension( lda, \* ) a, integer lda, integer, dimension( \* ) ipiv, integer, dimension( \* ) jpiv, integer info)

**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.

**Contributors:**

Bo Kagstrom and Peter Poromaa, Department of Computing Science, Umea University, S-901 87 Umea, Sweden.

Definition at line **110** of file **zgetc2.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.