---
name: "cheswapr"
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/cheswapr.f"
---

# cheswapr(3)

Part of [cheswapr.f(3)](/cheswapr.f/3.md).

## NAME

SRC/cheswapr.f

## SYNOPSIS

### Functions/Subroutines

subroutine **cheswapr** (uplo, n, a, lda, i1, i2)\
 **CHESWAPR** applies an elementary permutation on the rows and columns of a Hermitian matrix.

## Function/Subroutine Documentation

### subroutine cheswapr (character uplo, integer n, complex, dimension( lda, n ) a, integer lda, integer i1, integer i2)

**CHESWAPR** applies an elementary permutation on the rows and columns of a Hermitian matrix.

**Purpose:**

```
!>
!> CHESWAPR applies an elementary permutation on the rows and the columns of
!> a hermitian matrix.
!>
```

**Parameters**

*UPLO*

```
!>          UPLO is CHARACTER*1
!>          Specifies whether the details of the factorization are stored
!>          as an upper or lower triangular matrix.
!>          = 'U':  Upper triangular, form is A = U*D*U**T;
!>          = 'L':  Lower triangular, form is A = L*D*L**T.
!>
```

*N*

```
!>          N is INTEGER
!>          The order of the matrix A.  N >= 0.
!>
```

*A*

```
!>          A is COMPLEX array, dimension (LDA,N)
!>          On entry, the NB diagonal matrix D and the multipliers
!>          used to obtain the factor U or L as computed by CSYTRF.
!>
!>          On exit, if INFO = 0, the (symmetric) inverse of the original
!>          matrix.  If UPLO = 'U', the upper triangular part of the
!>          inverse is formed and the part of A below the diagonal is not
!>          referenced; if UPLO = 'L' the lower triangular part of the
!>          inverse is formed and the part of A above the diagonal is
!>          not referenced.
!>
```

*LDA*

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

*I1*

```
!>          I1 is INTEGER
!>          Index of the first row to swap
!>
```

*I2*

```
!>          I2 is INTEGER
!>          Index of the second row to swap
!>
```

**Author**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **101** of file **cheswapr.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.