https://github.com/stdlib-js/math-strided-special-sdeg2rad
Convert each element in a single-precision floating-point strided array from degrees to radians.
https://github.com/stdlib-js/math-strided-special-sdeg2rad
angle convert degrees float float32 float32array flt geometry javascript math mathematics node node-js nodejs radians single-precision stdlib trig trigonometry vector
Last synced: 2 months ago
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Convert each element in a single-precision floating-point strided array from degrees to radians.
- Host: GitHub
- URL: https://github.com/stdlib-js/math-strided-special-sdeg2rad
- Owner: stdlib-js
- License: apache-2.0
- Created: 2021-06-15T17:54:17.000Z (about 4 years ago)
- Default Branch: main
- Last Pushed: 2025-02-02T14:58:43.000Z (5 months ago)
- Last Synced: 2025-04-12T14:03:18.025Z (2 months ago)
- Topics: angle, convert, degrees, float, float32, float32array, flt, geometry, javascript, math, mathematics, node, node-js, nodejs, radians, single-precision, stdlib, trig, trigonometry, vector
- Language: JavaScript
- Homepage: https://github.com/stdlib-js/stdlib
- Size: 662 KB
- Stars: 2
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
- Citation: CITATION.cff
- Security: SECURITY.md
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README
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# sdeg2rad
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Convert each element in a single-precision floating-point strided array from degrees to radians.
## Installation
```bash
npm install @stdlib/math-strided-special-sdeg2rad
```
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 sdeg2rad = require( '@stdlib/math-strided-special-sdeg2rad' );
```
#### sdeg2rad( N, x, strideX, y, strideY )
Converts each element in a single-precision floating-point strided array `x` from degrees to radians and assigns the results to elements in a single-precision floating-point strided array `y`.
```javascript
var Float32Array = require( '@stdlib/array-float32' );
var x = new Float32Array( [ 0.0, 30.0, 45.0, 60.0, 90.0 ] );
// Perform operation in-place:
sdeg2rad( x.length, x, 1, x, 1 );
// x => [ 0.0, ~0.524, ~0.785, ~1.047, ~1.571 ]
```
The function accepts the following arguments:
- **N**: number of indexed elements.
- **x**: input [`Float32Array`][@stdlib/array/float32].
- **strideX**: index increment for `x`.
- **y**: output [`Float32Array`][@stdlib/array/float32].
- **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 to index the first `N` elements of `y` in reverse order,
```javascript
var Float32Array = require( '@stdlib/array-float32' );
var x = new Float32Array( [ 0.0, 30.0, 45.0, 60.0, 90.0, 120.0 ] );
var y = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
sdeg2rad( 3, x, 2, y, -1 );
// y => [ ~1.571, ~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`][@stdlib/array/float32] views.
```javascript
var Float32Array = require( '@stdlib/array-float32' );
// Initial arrays...
var x0 = new Float32Array( [ 0.0, 30.0, 45.0, 60.0, 90.0, 120.0 ] );
var y0 = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
// Create offset views...
var x1 = new Float32Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
var y1 = new Float32Array( y0.buffer, y0.BYTES_PER_ELEMENT*3 ); // start at 4th element
sdeg2rad( 3, x1, -2, y1, 1 );
// y0 => [ 0.0, 0.0, 0.0, ~2.094, ~1.047, ~0.524 ]
```
#### sdeg2rad.ndarray( N, x, strideX, offsetX, y, strideY, offsetY )
Converts each element in a single-precision floating-point strided array `x` from degrees to radians and assigns the results to elements in a single-precision floating-point strided array `y` using alternative indexing semantics.
```javascript
var Float32Array = require( '@stdlib/array-float32' );
var x = new Float32Array( [ 0.0, 30.0, 45.0, 60.0, 90.0 ] );
var y = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );
sdeg2rad.ndarray( x.length, x, 1, 0, y, 1, 0 );
// y => [ 0.0, ~0.524, ~0.785, ~1.047, ~1.571 ]
```
The function accepts the following additional arguments:
- **offsetX**: starting index for `x`.
- **offsetY**: starting index for `y`.
While [`typed array`][@stdlib/array/float32] 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 Float32Array = require( '@stdlib/array-float32' );
var x = new Float32Array( [ 0.0, 30.0, 45.0, 60.0, 90.0, 120.0 ] );
var y = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
sdeg2rad.ndarray( 3, x, 2, 1, y, -1, y.length-1 );
// y => [ 0.0, 0.0, 0.0, ~2.094, ~1.047, ~0.524 ]
```
## Examples
```javascript
var uniform = require( '@stdlib/random-base-uniform' );
var Float32Array = require( '@stdlib/array-float32' );
var sdeg2rad = require( '@stdlib/math-strided-special-sdeg2rad' );
var x = new Float32Array( 10 );
var y = new Float32Array( 10 );
var i;
for ( i = 0; i < x.length; i++ ) {
x[ i ] = uniform( -180.0, 180.0 );
}
console.log( x );
console.log( y );
sdeg2rad.ndarray( x.length, x, 1, 0, y, -1, y.length-1 );
console.log( y );
```
* * *
## C APIs
### Usage
```c
#include "stdlib/math/strided/special/sdeg2rad.h"
```
#### stdlib_strided_sdeg2rad( N, \*X, strideX, \*Y, strideY )
Converts each element in a single-precision floating-point strided array `x` from degrees to radians and assigns the results to elements in a single-precision floating-point strided array `y`.
```c
#include
const float X[] = { 0.0, 30.0, 45.0, 60.0, 90.0, 120.0, 150.0, 180.0 };
float Y[] = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
const int64_t N = 4;
stdlib_strided_sdeg2rad( N, X, 2, Y, 2 );
```
The function accepts the following arguments:
- **N**: `[in] int64_t` number of indexed elements.
- **X**: `[in] float*` input array.
- **strideX**: `[in] int64_t` index increment for `X`.
- **Y**: `[out] float*` output array.
- **strideY**: `[in] int64_t` index increment for `Y`.
```c
void stdlib_strided_sdeg2rad( const int64_t N, const float *X, const int64_t strideX, float *Y, const int64_t strideY );
```
### Examples
```c
#include "stdlib/math/strided/special/sdeg2rad.h"
#include
#include
int main( void ) {
// Create an input strided array:
const float X[] = { 0.0, 30.0, 45.0, 60.0, 90.0, 120.0, 150.0, 180.0 };
// Create an output strided array:
float Y[] = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
// Specify the number of elements:
const int64_t N = 4;
// Specify the stride lengths:
const int64_t strideX = 2;
const int64_t strideY = 2;
// Compute the results:
stdlib_strided_sdeg2rad( N, X, strideX, Y, strideY );
// Print the results:
for ( int i = 0; i < 8; i++ ) {
printf( "Y[ %i ] = %f\n", i, Y[ i ] );
}
}
```
* * *
## 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/deg2rad`][@stdlib/math/strided/special/deg2rad]: convert each element in a 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 © 2016-2025. The Stdlib [Authors][stdlib-authors].
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[npm-url]: https://npmjs.org/package/@stdlib/math-strided-special-sdeg2rad
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[stdlib]: https://github.com/stdlib-js/stdlib
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[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-sdeg2rad/tree/deno
[deno-readme]: https://github.com/stdlib-js/math-strided-special-sdeg2rad/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/math-strided-special-sdeg2rad/tree/umd
[umd-readme]: https://github.com/stdlib-js/math-strided-special-sdeg2rad/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/math-strided-special-sdeg2rad/tree/esm
[esm-readme]: https://github.com/stdlib-js/math-strided-special-sdeg2rad/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/math-strided-special-sdeg2rad/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/math-strided-special-sdeg2rad/main/LICENSE
[@stdlib/array/float32]: https://github.com/stdlib-js/array-float32
[@stdlib/math/strided/special/ddeg2rad]: https://github.com/stdlib-js/math-strided-special-ddeg2rad
[@stdlib/math/strided/special/deg2rad]: https://github.com/stdlib-js/math-strided-special-deg2rad