---
name: "dlarnv.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/dlarnv.f"
---

# dlarnv.f(3)

## NAME

SRC/dlarnv.f

## SYNOPSIS

### Functions/Subroutines

subroutine **dlarnv** (idist, iseed, n, x)\
 **DLARNV** returns a vector of random numbers from a uniform or normal distribution.

## Function/Subroutine Documentation

### subroutine dlarnv (integer idist, integer, dimension( 4 ) iseed, integer n, double precision, dimension( \* ) x)

**DLARNV** returns a vector of random numbers from a uniform or normal distribution.

**Purpose:**

```
!>
!> DLARNV returns a vector of n random real numbers 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.
!>
```

*N*

```
!>          N is INTEGER
!>          The number of random numbers to be generated.
!>
```

*X*

```
!>          X is DOUBLE PRECISION array, dimension (N)
!>          The generated random numbers.
!>
```

**Author**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**Further Details:**

```
!>
!>  This routine calls the auxiliary routine DLARUV to generate random
!>  real numbers from a uniform (0,1) distribution, in batches of up to
!>  128 using vectorisable code. The Box-Muller method is used to
!>  transform numbers from a uniform to a normal distribution.
!>
```

Definition at line **96** of file **dlarnv.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.