feat: add math/base/special/atanf

lib/node_modules/@stdlib/math/base/special/atanf/LICENSE

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+DEPENDENCIES & ATTRIBUTION
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+The library links against the following external libraries or contains
+implementations from the following external libraries, which have their own
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+* Cephes <http://www.netlib.org/cephes/readme>
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+Stephen L. Moshier
+moshier@na-net.ornl.gov

lib/node_modules/@stdlib/math/base/special/atanf/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2024 The Stdlib Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+-->
+
+# atanf
+
+> Compute the [arctangent][arctangent] of a single-precision floating-point number.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var atanf = require( '@stdlib/math/base/special/atanf' );
+```
+
+#### atanf( x )
+
+Computes the [arctangent][arctangent] of a single-precision floating-point number (in radians).
+
+```javascript
+var v = atanf( 0.0 );
+// returns 0.0
+
+v = atanf( -3.14/4.0 );
+// returns ~-0.666
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var linspace = require( '@stdlib/array/base/linspace' );
+var atanf = require( '@stdlib/math/base/special/atanf' );
+
+var x = linspace( -1.0, 1.0, 100 );
+
+var i;
+for ( i = 0; i < x.length; i++ ) {
+    console.log( atanf( x[ i ] ) );
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- C interface documentation. -->
+
+* * *
+
+<section class="c">
+
+## C APIs
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- C usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```c
+#include "stdlib/math/base/special/atanf.h"
+```
+
+#### stdlib_base_atanf( x )
+
+Computes the [arctangent][arctangent] of a single-precision floating-point number (in radians).
+
+```c
+float out = stdlib_base_atanf( 0.0f );
+// returns 0.0f
+
+out = stdlib_base_atanf( -3.14f/4.0f );
+// returns ~-0.666f
+```
+
+The function accepts the following arguments:
+
+-   **x**: `[in] float` input value (in radians).
+
+```c
+float stdlib_base_atanf( const float x );
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- C API usage examples. -->
+
+<section class="examples">
+
+### Examples
+
+```c
+#include "stdlib/math/base/special/atanf.h"
+#include <stdio.h>
+
+int main( void ) {
+    const float x[] = { -1.0f, -0.78f, -0.56f, -0.33f, -0.11f, 0.11f, 0.33f, 0.56f, 0.78f, 1.0f };
+
+    float v;
+    int i;
+    for ( i = 0; i < 10; i++ ) {
+        v = stdlib_base_atanf( x[ i ] );
+        printf( "atan(%f) = %f\n", x[ i ], v );
+    }
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+[arctangent]: https://en.wikipedia.org/wiki/Inverse_trigonometric_functions
+
+</section>
+
+<!-- /.links -->