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asec

README.md

asec

Compute the inverse (arc) secant of a number.

Usage

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

asec( x )

Computes the inverse (arc) secant of x.

var v = asec( 1.0 );
// returns 0.0

v = asec( 2.0 );
// returns ~1.0472

v = asec( NaN );
// returns NaN

The domain of x is restricted to the intervals [-inf, -1] and [1, inf]. For x outside of these intervals, the function returns NaN.

var v = asec( -0.5 );
// returns NaN

v = asec( 0.5 );
// returns NaN

Examples

var uniform = require( '@stdlib/random/array/uniform' );
var logEachMap = require( '@stdlib/console/log-each-map' );
var asec = require( '@stdlib/math/base/special/asec' );

var x = uniform( 100, 1.0, 10.0, {
    'dtype': 'float64'
});

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

C APIs

Usage

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

stdlib_base_asec( x )

Computes the inverse (arc) secant of x.

double out = stdlib_base_asec( 2.0 );
// returns ~1.0472

The function accepts the following arguments:

  • x: [in] double input value.
double stdlib_base_asec( const double x );

Examples

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

int main( void ) {
    const double x[] = { -5.0, -3.89, -2.78, -1.67, -0.56, 0.56, 1.67, 2.78, 3.89, 5.0 };

    double v;
    int i;
    for ( i = 0; i < 10; i++ ) {
        v = stdlib_base_asec( x[ i ] );
        printf( "asec(%lf) = %lf\n", x[ i ], v );
    }
}

See Also