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feat: add math/base/special/tanf
PR-URL: #7302 Ref: #649 Reviewed-by: Philipp Burckhardt <[email protected]>
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DEPENDENCIES & ATTRIBUTION
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The library links against the following external libraries or contains
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<!--
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@license Apache-2.0
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Copyright (c) 2025 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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# Tangent
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> Evaluate the [tangent][tangent] of a single-precision floating-point number (in radians).
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<section class="intro">
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The [tangent][tangent] is defined as
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<!-- <equation class="equation" label="eq:tangent" align="center" raw="\tan x = \frac{\sin x}{\cos x}" alt="Tangent definition."> -->
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```math
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\tan x = \frac{\sin x}{\cos x}
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```
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<!-- </equation> -->
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</section>
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<!-- /.intro -->
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<section class="usage">
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## Usage
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```javascript
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var tanf = require( '@stdlib/math/base/special/tanf' );
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```
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#### tanf( x )
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Evaluates the [tangent][tangent] of a single-precision floating-point number (in radians).
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```javascript
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var v = tanf( 0.0 );
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// returns ~0.0
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v = tanf( -3.141592653589793/4.0 );
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// returns ~-1.0
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v = tanf( 3.141592653589793/4.0 );
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// returns ~1.0
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v = tanf( 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 uniform = require( '@stdlib/random/array/uniform' );
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var logEachMap = require( '@stdlib/console/log-each-map' );
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var PI = require( '@stdlib/constants/float32/pi' );
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var tanf = require( '@stdlib/math/base/special/tanf' );
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var opts = {
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'dtype': 'float32'
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};
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var x = uniform( 100, -PI/2.0, PI/2.0, opts );
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logEachMap( 'tanf(%0.4f) = %0.4f', x, tanf );
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```
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</section>
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<!-- /.examples -->
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<!-- C interface documentation. -->
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* * *
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<section class="c">
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## C APIs
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<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
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<section class="intro">
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</section>
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<!-- /.intro -->
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<!-- C usage documentation. -->
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<section class="usage">
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### Usage
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```c
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#include "stdlib/math/base/special/tanf.h"
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```
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#### stdlib_base_tanf( x )
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Evaluates the [tangent][tangent] of a single-precision floating-point number (in radians).
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```c
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float y = stdlib_base_tanf( -3.141592653589793f / 4.0f );
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// returns ~-1.0f
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```
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The function accepts the following arguments:
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- **x**: `[in] float` input value.
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```c
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float stdlib_base_tanf( const float x );
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```
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</section>
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<!-- /.usage -->
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<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="notes">
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</section>
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<!-- /.notes -->
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<!-- C API usage examples. -->
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<section class="examples">
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### Examples
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```c
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#include "stdlib/math/base/special/tanf.h"
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#include <stdio.h>
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int main( void ) {
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const float x[] = { 0.0f, 0.523f, 0.785f, 1.047f, 3.14f };
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float y;
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int i;
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for ( i = 0; i < 5; i++ ) {
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y = stdlib_base_tanf( x[ i ] );
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printf( "tanf(%f) = %f\n", x[ i ], y );
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}
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}
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```
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</section>
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<!-- /.examples -->
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</section>
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<!-- /.c -->
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<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
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<section class="related">
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</section>
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<!-- /.related -->
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<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="links">
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[tangent]: http://mathworld.wolfram.com/Tangent.html
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<!-- <related-links> -->
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<!-- </related-links> -->
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</section>
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<!-- /.links -->

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