---
name: "dlat2s.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/dlat2s.f"
---

# dlat2s.f(3)

## NAME

SRC/dlat2s.f

## SYNOPSIS

### Functions/Subroutines

subroutine **dlat2s** (uplo, n, a, lda, sa, ldsa, info)\
 **DLAT2S** converts a double-precision triangular matrix to a single-precision triangular matrix.

## Function/Subroutine Documentation

### subroutine dlat2s (character uplo, integer n, double precision, dimension( lda, \* ) a, integer lda, real, dimension( ldsa, \* ) sa, integer ldsa, integer info)

**DLAT2S** converts a double-precision triangular matrix to a single-precision triangular matrix.

**Purpose:**

```
!>
!> DLAT2S converts a DOUBLE PRECISION triangular matrix, SA, to a SINGLE
!> PRECISION triangular matrix, A.
!>
!> RMAX is the overflow for the SINGLE PRECISION arithmetic
!> DLAS2S checks that all the entries of A are between -RMAX and
!> RMAX. If not the conversion is aborted and a flag is raised.
!>
!> This is an auxiliary routine so there is no argument checking.
!>
```

**Parameters**

*UPLO*

```
!>          UPLO is CHARACTER*1
!>          = 'U':  A is upper triangular;
!>          = 'L':  A is lower triangular.
!>
```

*N*

```
!>          N is INTEGER
!>          The number of rows and columns of the matrix A.  N >= 0.
!>
```

*A*

```
!>          A is DOUBLE PRECISION array, dimension (LDA,N)
!>          On entry, the N-by-N triangular coefficient matrix A.
!>
```

*LDA*

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

*SA*

```
!>          SA is REAL array, dimension (LDSA,N)
!>          Only the UPLO part of SA is referenced.  On exit, if INFO=0,
!>          the N-by-N coefficient matrix SA; if INFO>0, the content of
!>          the UPLO part of SA is unspecified.
!>
```

*LDSA*

```
!>          LDSA is INTEGER
!>          The leading dimension of the array SA.  LDSA >= max(1,M).
!>
```

*INFO*

```
!>          INFO is INTEGER
!>          = 0:  successful exit.
!>          = 1:  an entry of the matrix A is greater than the SINGLE
!>                PRECISION overflow threshold, in this case, the content
!>                of the UPLO part of SA in exit is unspecified.
!>
```

**Author**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **110** of file **dlat2s.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.