84 lines
1.5 KiB
Markdown
84 lines
1.5 KiB
Markdown
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@license Apache-2.0
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Copyright (c) 2018 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# atan
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> Compute the [arctangent][arctangent] of a number.
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<section class="usage">
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## Usage
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```javascript
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var atan = require( '@stdlib/math/base/special/atan' );
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```
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#### atan( x )
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Computes the [arctangent][arctangent] of a `number`.
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```javascript
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var v = atan( 0.0 );
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// returns ~0.0
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v = atan( -3.141592653589793/2.0 );
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// returns ~-1.004
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v = atan( 3.141592653589793/2.0 );
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// returns ~1.004
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v = atan( NaN );
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// returns NaN
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```
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</section>
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<!-- /.usage -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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```javascript
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var linspace = require( '@stdlib/array/linspace' );
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var atan = require( '@stdlib/math/base/special/atan' );
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var x = linspace( -1000.0, 1000.0, 100 );
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var i;
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for ( i = 0; i < x.length; i++ ) {
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console.log( atan( x[ i ] ) );
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}
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```
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</section>
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<!-- /.examples -->
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<section class="links">
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[arctangent]: https://en.wikipedia.org/wiki/Inverse_trigonometric_functions
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</section>
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<!-- /.links -->
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