npm package: @stdlib/blas-base-matrix-triangles
Description: BLAS matrix triangles.
Author: The Stdlib Authors
Latest version: 0.0.3

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    About stdlib...
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# Triangular Parts

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> BLAS matrix triangles.

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</section>

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<section class="installation">

## Installation

```bash
npm install @stdlib/blas-base-matrix-triangles
```

</section>

<section class="usage">

## Usage

```javascript
var matrixTriangles = require( '@stdlib/blas-base-matrix-triangles' );
```

#### matrixTriangles()

Returns a list of BLAS matrix triangles.

```javascript
var out = matrixTriangles();
// e.g., returns [ 'upper', 'lower' ]
```

The output array contains the following types:

-   `upper`: upper triangular part of a matrix.
-   `lower`: lower triangular part of a matrix.

</section>

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<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var contains = require( '@stdlib/array-base-assert-contains' ).factory;
var matrixTriangles = require( '@stdlib/blas-base-matrix-triangles' );

var isMatrixTriangle = contains( matrixTriangles() );

var bool = isMatrixTriangle( 'lower' );
// returns true

bool = isMatrixTriangle( 'upper' );
// returns true

bool = isMatrixTriangle( 'beep' );
// returns false
```

</section>

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<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

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</section>

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### Usage

```c
#include "stdlib/blas/base/matrix_triangles.h"
```

#### STDLIB_BLAS_MATRIX_TRIANGLE

An enumeration of BLAS matrix triangles with the following fields:

-   **STDLIB_BLAS_UPPER**: upper triangular part of a matrix.
-   **STDLIB_BLAS_LOWER**: lower triangular part of a matrix.

```c
#include "stdlib/blas/base/matrix_triangles.h"

const enum STDLIB_BLAS_MATRIX_TRIANGLE v = STDLIB_BLAS_LOWER;
```

</section>

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<section class="notes">

### Notes

-   Enumeration constants should be considered opaque values, and one should **not** rely on specific integer values.

</section>

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* * *

## Notice

This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].

#### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

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