Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | /**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var abs = require( '@stdlib/math/base/special/abs' );
var isnan = require( '@stdlib/assert/is-nan' );
var FOURTH_PI = require( '@stdlib/constants/float64/fourth-pi' );
var HALF_PI = require( '@stdlib/constants/float64/half-pi' );
var cos = require( '@stdlib/math/base/special/cos' );
// MAIN //
/**
* Computes the cosine kernel for a value.
*
* @private
* @param {number} u - value for which we wish to calculate the cosine kernel
* @returns {number} the value for the kernel at u
*
* @example
* var u = 5;
* var out = cosine( u );
* // returns 0.0
*/
function cosine( u ) {
if ( isnan( u ) ) {
return NaN;
}
if ( abs( u ) > 1.0 ) {
return 0.0;
}
return FOURTH_PI * cos( HALF_PI * u );
}
// EXPORTS //
module.exports = cosine;
|