---
title: generate.from() function
description: >
  `generate.from()` generates data using the provided parameter values.
menu:
  flux_v0_ref:
    name: generate.from
    parent: generate
    identifier: generate/from
weight: 101
flux/v0/tags: [inputs]
---

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`generate.from()` generates data using the provided parameter values.



##### Function type signature

```js
(count: int, fn: (n: int) => int, start: A, stop: A) => stream[{_value: int, _time: time, _stop: time, _start: time}] where A: Timeable
```

{{% caption %}}
For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
{{% /caption %}}

## Parameters

### count
({{< req >}})
Number of rows to generate.



### fn
({{< req >}})
Function used to generate values.

The function takes an `n` parameter that represents the row index, operates
on `n`, and then returns an integer value. Rows use zero-based indexing.

### start
({{< req >}})
Beginning of the time range to generate values in.



### stop
({{< req >}})
End of the time range to generate values in.




## Examples

### Generate sample data

```js
import "generate"

generate.from(
    count: 6,
    fn: (n) => (n + 1) * (n + 2),
    start: 2021-01-01T00:00:00Z,
    stop: 2021-01-02T00:00:00Z,
)

```