sincospi
Simultaneously compute the sine and cosine of a number times π.
Usage
var sincospi = require( '@stdlib/math/base/special/sincospi' );
sincospi( [out,] x )
Simultaneously computes the sine and cosine of a number
times π more accurately than sincos(pi*x)
, especially for large x
.
var v = sincospi( 0.0 );
// returns [ 0.0, 1.0 ]
v = sincospi( 0.5 );
// returns [ 1.0, 0.0 ]
v = sincospi( 0.1 );
// returns [ ~0.309, ~0.951 ]
v = sincospi( NaN );
// returns [ NaN, NaN ]
By default, the function returns a two-element array
containing sin(πx)
and cos(πx)
. To avoid extra memory allocation, the function supports providing an output (destination) object.
var Float64Array = require( '@stdlib/array/float64' );
var out = new Float64Array( 2 );
var v = sincospi( out, 0.0 );
// returns <Float64Array>[ 0.0, 1.0 ]
var bool = ( v === out );
// returns true
Examples
var linspace = require( '@stdlib/array/base/linspace' );
var sincospi = require( '@stdlib/math/base/special/sincospi' );
var x = linspace( 0.0, 2.0, 101 );
var i;
for ( i = 0; i < x.length; i++ ) {
console.log( sincospi( x[ i ] ) );
}