kernelTanf

Compute the tangent of a number on [-π/4, π/4] in single-precision floating-point format.

Installation

npm install @stdlib/math-base-special-kernel-tanf

Usage

var kernelTanf = require( '@stdlib/math-base-special-kernel-tanf' );

kernelTanf( x, iy )

Computes the tangent of a number on [-π/4, π/4] in single-precision floating-point format.

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.

var out = kernelTanf( 3.141592653589793/4.0, -1 );
// returns ~-1.0

If provided NaN for x, the function returns NaN.

var out = kernelTanf( NaN, 1 );
// returns NaN

out = kernelTanf( NaN, -1 );
// returns NaN

Examples

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 APIs

Usage

#include "stdlib/math/base/special/kernel_tanf.h"

stdlib_base_kernel_tanf( x, iy )

Computes the tangent of a number on [-π/4, π/4] in single-precision floating-point format.

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).
• iy: [in] int32_t indicates whether tan(x) (if iy = 1) or -1/tan(x) (if iy = -1) is returned.

float stdlib_base_kernel_tanf( const double x, const int32_t iy );

Examples

#include "stdlib/math/base/special/kernel_tanf.h"
#include <stdio.h>

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 );
    }
}

Notice

This package is part of 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, see the main project repository.

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Copyright

Copyright © 2016-2026. The Stdlib Authors.