Tangent
Evaluate the tangent of a number.
The tangent is defined as
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 ] ) );
}
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 );
}
}