@stdlib/math-base-special-tan

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Tangent

Evaluate the tangent of a number.

The tangent is defined as

Installation

npm install @stdlib/math-base-special-tan

Usage

var tan = require( '@stdlib/math-base-special-tan' );

tan( x )

Evaluates the tangent of a number (in radians).

var v = tan( 0.0 );
// returns ~0.0

v = tan( -3.141592653589793/4.0 );
// returns ~-1.0

v = tan( 3.141592653589793/4.0 );
// returns ~1.0

v = tan( NaN );
// returns NaN

Examples

var linspace = require( '@stdlib/array-base-linspace' );
var PI = require( '@stdlib/constants-float64-pi' );
var tan = require( '@stdlib/math-base-special-tan' );

var x = linspace( -PI/2.0, PI/2.0, 100 );

var i;
for ( i = 0; i < x.length; i++ ) {
    console.log( tan( x[ i ] ) );
}

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C APIs

Usage

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

stdlib_base_tan( x )

Evaluates the tangent of a number (in radians).

double y = stdlib_base_tan( -3.141592653589793 / 4.0 );
// returns ~-1.0

The function accepts the following arguments:

• x: [in] double input value.

double stdlib_base_tan( const double x );

Examples

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

int main( void ) {
    const double x[] = { 0.0, 0.523, 0.785, 1.047, 3.14 };

    double y;
    int i;
    for ( i = 0; i < 5; i++ ) {
        y = stdlib_base_tan( x[ i ] );
        printf( "tan(%lf) = %lf\n", x[ i ], y );
    }
}

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See Also

• @stdlib/math-base/special/cos: compute the cosine of a number.
• @stdlib/math-base/special/sin: compute the sine of a number.

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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.

Community

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Copyright

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