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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 sincos = require( '@stdlib/math/base/special/sincos' ).assign;
var exp = require( '@stdlib/math/base/special/exp' );
var Complex128 = require( '@stdlib/complex/float64/ctor' );
var real = require( '@stdlib/complex/float64/real' );
var imag = require( '@stdlib/complex/float64/imag' );
// VARIABLES //
// Pre-allocate workspace array:
var WORKSPACE = [ 0.0, 0.0 ];
// MAIN //
/**
* Evaluates the cis function for a double-precision complex floating-point number.
*
* @param {Complex128} z - complex number
* @returns {Complex128} result
*
* @example
* var Complex128 = require( '@stdlib/complex/float64/ctor' );
*
* var z = new Complex128( 0.0, 0.0 );
* // returns <Complex128>
*
* var out = ccis( z );
* // returns <Complex128>[ 1.0, 0.0 ]
*
* @example
* var Complex128 = require( '@stdlib/complex/float64/ctor' );
*
* var z = new Complex128( 1.0, 0.0 );
* // returns <Complex128>
*
* var out = ccis( z );
* // returns <Complex128>[ ~0.540, ~0.841 ]
*/
function ccis( z ) {
var re;
var im;
var e;
re = real( z );
im = imag( z );
sincos( re, WORKSPACE, 1, 0 );
if ( im !== 0.0 ) {
e = exp( -im );
WORKSPACE[ 0 ] *= e;
WORKSPACE[ 1 ] *= e;
}
return new Complex128( WORKSPACE[ 1 ], WORKSPACE[ 0 ] );
}
// EXPORTS //
module.exports = ccis;
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