Skip to content

tan

Directory actions

More options

Directory actions

More options

Latest commit

 

History

History

tan

README.md

Tangent

Evaluate the tangent of a number.

The tangent is defined as

$$\tan x = \frac{\sin x}{\cos x}$$

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 uniform = require( '@stdlib/random/array/uniform' );
var logEachMap = require( '@stdlib/console/log-each-map' );
var PI = require( '@stdlib/constants/float64/pi' );
var tan = require( '@stdlib/math/base/special/tan' );

var opts = {
    'dtype': 'float64'
};
var x = uniform( 100, -PI/2.0, PI/2.0, opts );

logEachMap( 'tan(%0.4f) = %0.4f', x, tan );

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 );
    }
}

See Also