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---
title: array
---
# The `stdlib_array` module
[TOC]
## Introduction
Module for index manipulation and array handling tasks.
## Procedures and methods provided
### `trueloc`
#### Status
Experimental
#### Description
Turn a logical mask into an index array by selecting all true values.
Provides similar functionality like the built-in `where` or the intrinsic procedures `merge` and `pack` when working with logical mask.
The built-in / intrinsics are usually preferable to `trueloc`, unless the access to the index array is required.
#### Syntax
`loc =` [[trueloc(function)]] `(array[, lbound])`
#### Class
Pure function.
#### Arguments
`array`: List of default logical arrays. This argument is `intent(in)`.
`lbound`: Lower bound of the array to index. This argument is `optional` and `intent(in)`.
#### Return value
Returns an array of default integer size, with a maximum length of `size(array)` elements.
#### Examples
```fortran
{!example/array/example_trueloc.f90!}
```
### `falseloc`
#### Status
Experimental
#### Description
Turn a logical mask into an index array by selecting all false values.
Provides similar functionality like the built-in `where` or the intrinsic procedures `merge` and `pack` when working with logical mask.
The built-in / intrinsics are usually preferable to `falseloc`, unless the access to the index array is required.
#### Syntax
`loc =` [[falseloc(function)]] `(array[, lbound])`
#### Class
Pure function.
#### Arguments
`array`: List of default logical arrays. This argument is `intent(in)`.
`lbound`: Lower bound of the array to index. This argument is `optional` and `intent(in)`.
#### Return value
Returns an array of default integer size, with a maximum length of `size(array)` elements.
#### Examples
```fortran
{!example/array/example_falseloc.f90!}
```
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