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* @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 ln = require( '@stdlib/math/base/special/ln' );
var rateval1 = require( './rational_ak1bk1.js' );
var rateval2 = require( './rational_ak2bk2.js' );
var rateval3 = require( './rational_ak3bk3.js' );
// MAIN //
/**
* Evaluates the `eps2` function.
*
* @private
* @param {number} eta - eta value
* @returns {number} function value
*/
function eps2( eta ) {
var lnmeta;
var x;
if ( eta < -5.0 ) {
x = eta * eta;
lnmeta = ln( -eta );
return ( 12.0 - x - ( 6.0*( lnmeta*lnmeta ) ) ) / ( 12.0*x*eta );
}
if ( eta < -2.0 ) {
return rateval1( eta );
}
if ( eta < 2.0 ) {
return rateval2( eta );
}
if ( eta < 1000.0 ) {
x = 1.0 / eta;
return rateval3( eta ) / ( -12.0*eta );
}
return -1.0 / ( 12.0 * eta );
}
// EXPORTS //
module.exports = eps2;
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