---
name: "dlarnd"
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/dlarnd.f"
---

# dlarnd(3)

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

## NAME

TESTING/MATGEN/dlarnd.f

## SYNOPSIS

### Functions/Subroutines

double precision function **dlarnd** (idist, iseed)\
 **DLARND**

## Function/Subroutine Documentation

### double precision function dlarnd (integer idist, integer, dimension( 4 ) iseed)

**DLARND**

**Purpose:**

```
!>
!> DLARND returns a random real number from a uniform or normal
!> distribution.
!>
```

**Parameters**

*IDIST*

```
!>          IDIST is INTEGER
!>          Specifies the distribution of the random numbers:
!>          = 1:  uniform (0,1)
!>          = 2:  uniform (-1,1)
!>          = 3:  normal (0,1)
!>
```

*ISEED*

```
!>          ISEED is INTEGER array, dimension (4)
!>          On entry, the seed of the random number generator; the array
!>          elements must be between 0 and 4095, and ISEED(4) must be
!>          odd.
!>          On exit, the seed is updated.
!>
```

**Author**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**Further Details:**

```
!>
!>  This routine calls the auxiliary routine DLARAN to generate a random
!>  real number from a uniform (0,1) distribution. The Box-Muller method
!>  is used to transform numbers from a uniform to a normal distribution.
!>
```

Definition at line **72** of file **dlarnd.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.