@stdlib/math-base-special-cosm1
v0.2.1
Published
Compute the cosine of a number minus one.
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cosm1
Compute
cos(x) - 1
.
Installation
npm install @stdlib/math-base-special-cosm1
Usage
var cosm1 = require( '@stdlib/math-base-special-cosm1' );
cosm1( x )
Computes cos(x) - 1
, where cos
is the cosine of a number
(in radians). This function should be used instead of manually calculating cos(x) - 1
when the argument is near unity.
var PI = require( '@stdlib/constants-float64-pi' );
var v = cosm1( 0.0 );
// returns 0.0
v = cosm1( PI/4.0 );
// returns ~-0.293
v = cosm1( -PI/6.0 );
// returns ~-0.134
v = cosm1( NaN );
// returns NaN
Examples
var linspace = require( '@stdlib/array-base-linspace' );
var PI = require( '@stdlib/constants-float64-pi' );
var cosm1 = require( '@stdlib/math-base-special-cosm1' );
var x = linspace( 0.0, 2.0*PI, 100 );
var i;
for ( i = 0; i < x.length; i++ ) {
console.log( cosm1( x[ i ] ) );
}
See Also
@stdlib/math-base/special/cos
: compute the cosine of a number.
Notice
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
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Copyright
Copyright © 2016-2024. The Stdlib Authors.