Compute the tangent of a number on [-π/4, π/4] in single-precision floating-point format.
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> Compute the [tangent][tangent] of a number on [-π/4, π/4] in single-precision floating-point format.
``bash`
npm install @stdlib/math-base-special-kernel-tanf
`javascript`
var kernelTanf = require( '@stdlib/math-base-special-kernel-tanf' );
#### kernelTanf( x, iy )
Computes the [tangent][tangent] of a number on [-π/4, π/4] in single-precision floating-point format.
`javascript
var out = kernelTanf( 3.141592653589793/4.0, 1 );
// returns ~1.0
out = kernelTanf( 3.141592653589793/6.0, 1 );
// returns ~0.577
out = kernelTanf( 0.664, 1 );
// returns ~0.783
`
If k = 1, the function returns tan(x). To return the negative inverse -1/tan(x), set k = -1.
`javascript`
var out = kernelTanf( 3.141592653589793/4.0, -1 );
// returns ~-1.0
If provided NaN for x, the function returns NaN.
`javascript
var out = kernelTanf( NaN, 1 );
// returns NaN
out = kernelTanf( NaN, -1 );
// returns NaN
`
`javascript
var linspace = require( '@stdlib/array-base-linspace' );
var PI = require( '@stdlib/constants-float32-pi' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var kernelTanf = require( '@stdlib/math-base-special-kernel-tanf' );
var x = linspace( -PI/4.0, PI/4.0, 100 );
logEachMap( 'kernelTanf(%0.4f, %d) = %0.4f', x, 1, kernelTanf );
`
*
`c`
#include "stdlib/math/base/special/kernel_tanf.h"
#### stdlib_base_kernel_tanf( x, iy )
Computes the [tangent][tangent] of a number on [-π/4, π/4] in single-precision floating-point format.
`c
float out = stdlib_base_kernel_tanf( 3.141592653589793/4.0, 1 );
// returns ~1.0f
out = stdlib_base_kernel_tanf( 3.141592653589793/6.0, 1 );
// returns ~0.577f
`
The function accepts the following arguments:
- x: [in] double input value (in radians, assumed to be bounded by ~pi/4 in magnitude).[in] int32_t
- iy: indicates whether tan(x) (if iy = 1) or -1/tan(x) (if iy = -1) is returned.
`c`
float stdlib_base_kernel_tanf( const double x, const int32_t iy );
`c
#include "stdlib/math/base/special/kernel_tanf.h"
#include
int main( void ) {
const double x[] = { -0.7853981633974483, -0.6108652381980153, -0.4363323129985824, -0.26179938779914946, -0.08726646259971649, 0.08726646259971649, 0.26179938779914935, 0.43633231299858233, 0.6108652381980153, 0.7853981633974483 };
float out;
int i;
for ( i = 0; i < 10; i++ ) {
out = stdlib_base_kernel_tanf( x[ i ], 1 );
printf( "kernelTanf(%lf, %d) = %f\n", x[ i ], 1, out );
}
}
`
*
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].
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---
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[tangent]: https://en.wikipedia.org/wiki/Tangent