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https://github.com/stdlib-js/math-strided-special-deg2rad

Convert each element in a strided array from degrees to radians.
https://github.com/stdlib-js/math-strided-special-deg2rad

angle array convert degrees element-wise geometry javascript math mathematics ndarray node node-js nodejs radians stdlib strided trig trigonometry vector

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Convert each element in a strided array from degrees to radians.

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README 

        



  

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# deg2rad



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



> Convert each element in a strided array from degrees to radians.



## Installation



```bash

npm install @stdlib/math-strided-special-deg2rad

```



Alternatively,



-   To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]).

-   If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).

-   For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]).



The [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships.



To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.



## Usage



```javascript

var deg2rad = require( '@stdlib/math-strided-special-deg2rad' );

```



#### deg2rad( N, dtypeX, x, strideX, dtypeY, y, strideY )



Converts each element in a strided array `x` from degrees to radians and assigns the results to elements in a strided array `y`.



```javascript

var Float64Array = require( '@stdlib/array-float64' );



var x = new Float64Array( [ 0.0, 30.0, 45.0, 90.0, 120.0 ] );



// Perform operation in-place:

deg2rad( x.length, 'float64', x, 1, 'float64', x, 1 );

// x => [ 0.0, ~0.524, ~0.785, ~1.571, ~2.094 ]

```



The function accepts the following arguments:



-   **N**: number of indexed elements.

-   **dtypeX**: [data type][@stdlib/strided/dtypes] for `x`.

-   **x**: input array-like object.

-   **strideX**: index increment for `x`.

-   **dtypeY**: [data type][@stdlib/strided/dtypes] for `y`.

-   **y**: output array-like object.

-   **strideY**: index increment for `y`.



The `N` and `stride` parameters determine which elements in `x` and `y` are accessed at runtime. For example, to index every other value in `x` and the first `N` elements of `y` in reverse order,



```javascript

var Float64Array = require( '@stdlib/array-float64' );



var x = new Float64Array( [ 0.0, 30.0, 45.0, 90.0, 120.0, 135.0 ] );

var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );



deg2rad( 3, 'float64', x, 2, 'float64', y, -1 );

// y => [ ~2.094, ~0.785, 0.0, 0.0, 0.0, 0.0 ]

```



Note that indexing is relative to the first index. To introduce an offset, use [`typed array`][mdn-typed-array] views.



```javascript

var Float64Array = require( '@stdlib/array-float64' );



// Initial arrays...

var x0 = new Float64Array( [ 0.0, 30.0, 45.0, 90.0, 120.0, 135.0 ] );

var y0 = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );



// Create offset views...

var x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element

var y1 = new Float64Array( y0.buffer, y0.BYTES_PER_ELEMENT*3 ); // start at 4th element



deg2rad( 3, 'float64', x1, -2, 'float64', y1, 1 );

// y0 => [ 0.0, 0.0, 0.0, ~2.356, ~1.571, ~0.524 ]

```



#### deg2rad.ndarray( N, dtypeX, x, strideX, offsetX, dtypeY, y, strideY, offsetY )



Converts each element in a strided array `x` from degrees to radians and assigns the results to elements in a strided array `y` using alternative indexing semantics.



```javascript

var Float64Array = require( '@stdlib/array-float64' );



var x = new Float64Array( [ 0.0, 30.0, 45.0, 90.0, 120.0 ] );

var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );



deg2rad.ndarray( x.length, 'float64', x, 1, 0, 'float64', y, 1, 0 );

// y => [ 0.0, ~0.524, ~0.785, ~1.571, ~2.094 ]

```



The function accepts the following additional arguments:



-   **offsetX**: starting index for `x`.

-   **offsetY**: starting index for `y`.



While [`typed array`][mdn-typed-array] views mandate a view offset based on the underlying `buffer`, the `offsetX` and `offsetY` parameters support indexing semantics based on starting indices. For example, to index every other value in `x` starting from the second value and to index the last `N` elements in `y`,



```javascript

var Float64Array = require( '@stdlib/array-float64' );



var x = new Float64Array( [ 0.0, 30.0, 45.0, 90.0, 120.0, 135.0 ] );

var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );



deg2rad.ndarray( 3, 'float64', x, 2, 1, 'float64', y, -1, y.length-1 );

// y => [ 0.0, 0.0, 0.0, ~2.356, ~1.571, ~0.524 ]

```



## Examples



```javascript

var uniform = require( '@stdlib/random-base-uniform' ).factory;

var filledarray = require( '@stdlib/array-filled' );

var filledarrayBy = require( '@stdlib/array-filled-by' );

var dtypes = require( '@stdlib/array-typed-real-float-dtypes' );

var deg2rad = require( '@stdlib/math-strided-special-deg2rad' );



var dt;

var x;

var y;

var i;



dt = dtypes();

for ( i = 0; i < dt.length; i++ ) {

    x = filledarrayBy( 10, dt[ i ], uniform( -180.0, 180.0 ) );

    console.log( x );



    y = filledarray( 0.0, x.length, 'generic' );

    console.log( y );



    deg2rad.ndarray( x.length, dt[ i ], x, 1, 0, 'generic', y, -1, y.length-1 );

    console.log( y );

    console.log( '' );

}

```



* * *



## See Also



-   [`@stdlib/math-strided/special/ddeg2rad`][@stdlib/math/strided/special/ddeg2rad]: convert each element in a double-precision floating-point strided array from degrees to radians.

-   [`@stdlib/math-strided/special/sdeg2rad`][@stdlib/math/strided/special/sdeg2rad]: convert each element in a single-precision floating-point strided array from degrees to radians.



* * *



## 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 © 2016-2024. The Stdlib [Authors][stdlib-authors].



[npm-image]: http://img.shields.io/npm/v/@stdlib/math-strided-special-deg2rad.svg

[npm-url]: https://npmjs.org/package/@stdlib/math-strided-special-deg2rad



[test-image]: https://github.com/stdlib-js/math-strided-special-deg2rad/actions/workflows/test.yml/badge.svg?branch=main

[test-url]: https://github.com/stdlib-js/math-strided-special-deg2rad/actions/workflows/test.yml?query=branch:main



[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/math-strided-special-deg2rad/main.svg

[coverage-url]: https://codecov.io/github/stdlib-js/math-strided-special-deg2rad?branch=main



[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg

[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im



[stdlib]: https://github.com/stdlib-js/stdlib



[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors



[umd]: https://github.com/umdjs/umd

[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules



[deno-url]: https://github.com/stdlib-js/math-strided-special-deg2rad/tree/deno

[deno-readme]: https://github.com/stdlib-js/math-strided-special-deg2rad/blob/deno/README.md

[umd-url]: https://github.com/stdlib-js/math-strided-special-deg2rad/tree/umd

[umd-readme]: https://github.com/stdlib-js/math-strided-special-deg2rad/blob/umd/README.md

[esm-url]: https://github.com/stdlib-js/math-strided-special-deg2rad/tree/esm

[esm-readme]: https://github.com/stdlib-js/math-strided-special-deg2rad/blob/esm/README.md

[branches-url]: https://github.com/stdlib-js/math-strided-special-deg2rad/blob/main/branches.md



[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/math-strided-special-deg2rad/main/LICENSE



[mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray



[@stdlib/strided/dtypes]: https://github.com/stdlib-js/strided-dtypes



[@stdlib/math/strided/special/ddeg2rad]: https://github.com/stdlib-js/math-strided-special-ddeg2rad



[@stdlib/math/strided/special/sdeg2rad]: https://github.com/stdlib-js/math-strided-special-sdeg2rad