sinc
Compute the cardinal sine of a number.
The normalized cardinal sine function is defined as
for any real number x
.
Usage
var sinc = require( '@stdlib/math/base/special/sinc' );
sinc( x )
Computes the normalized cardinal sine of a number
.
var v = sinc( 0.5 );
// returns ~0.637
v = sinc( -1.2 );
// returns ~-0.156
v = sinc( 0.0 );
// returns 1.0
v = sinc( NaN );
// returns NaN
Examples
var linspace = require( '@stdlib/array/base/linspace' );
var sinc = require( '@stdlib/math/base/special/sinc' );
var x = linspace( -5.0, 5.0, 100 );
var i;
for ( i = 0; i < x.length; i++ ) {
console.log( sinc( x[ i ] ) );
}
C APIs
Usage
#include "stdlib/math/base/special/sinc.h"
stdlib_base_sinc( x )
Computes the normalized cardinal sine of a number
.
double y = stdlib_base_sinc( 0.5 );
// returns ~0.637
The function accepts the following arguments:
- x:
[in] double
input value.
double stdlib_base_sinc( const double x );
Examples
#include "stdlib/math/base/special/sinc.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_sinc( x[ i ] );
printf( "sinc(%lf) = %lf\n", x[ i ], y );
}
}