# cgesc2.f man page

cgesc2.f

## Synopsis

### Functions/Subroutines

subroutine cgesc2 (N, A, LDA, RHS, IPIV, JPIV, SCALE)
CGESC2 solves a system of linear equations using the LU factorization with complete pivoting computed by sgetc2.

## Function/Subroutine Documentation

### subroutine cgesc2 (integer N, complex, dimension( lda, * ) A, integer LDA, complex, dimension( * ) RHS, integer, dimension( * ) IPIV, integer, dimension( * ) JPIV, real SCALE)

CGESC2 solves a system of linear equations using the LU factorization with complete pivoting computed by sgetc2.

Purpose:

``` CGESC2 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 CGETC2.```
Parameters:

N

```          N is INTEGER
The number of columns of the matrix A.```

A

```          A is COMPLEX array, dimension (LDA, N)
On entry, the  LU part of the factorization of the n-by-n
matrix A computed by CGETC2:  A = P * L * U * Q```

LDA

```          LDA is INTEGER
The leading dimension of the array A.  LDA >= max(1, N).```

RHS

```          RHS is COMPLEX 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 REAL
On exit, SCALE contains the scale factor. SCALE is chosen
0 <= SCALE <= 1 to prevent owerflow in the solution.```
Author:

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Date:

December 2016

Contributors:

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

Definition at line 117 of file cgesc2.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

The man page cgesc2(3) is an alias of cgesc2.f(3).

Tue Nov 14 2017 Version 3.8.0 LAPACK