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* @license Apache-2.0
*
* Copyright (c) 2026 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 reinterpret = require( '@stdlib/strided/base/reinterpret-complex128' );
var real = require( '@stdlib/complex/float64/real' );
var imag = require( '@stdlib/complex/float64/imag' );
// MAIN //
/**
* Fills a double-precision complex floating-point strided array with linearly spaced numeric elements which increment by `1` starting from a specified value using alternative indexing semantics.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {ComplexLike} start - starting value
* @param {Complex128Array} x - input array
* @param {integer} strideX - stride length
* @param {NonNegativeInteger} offsetX - starting index
* @returns {Complex128Array} input array
*
* @example
* var Complex128Array = require( '@stdlib/array/complex128' );
* var Complex128 = require( '@stdlib/complex/float64/ctor' );
*
* var x = new Complex128Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
*
* zunitspace( x.length, new Complex128( 3.0, 0.0 ), x, 1, 0 );
* // x => <Complex128Array>[ 3.0, 0.0, 4.0, 0.0, 5.0, 0.0, 6.0, 0.0 ]
*/
function zunitspace( N, start, x, strideX, offsetX ) {
var view;
var re;
var im;
var ix;
var i;
if ( N <= 0 ) {
return x;
}
// Decompose the starting value into its real and imaginary components:
re = real( start );
im = imag( start );
// Reinterpret the complex input array as a real-valued array:
view = reinterpret( x, 0 );
// Adjust the stride and offset according to real-valued array:
ix = offsetX * 2;
strideX *= 2;
for ( i = 0; i < N; i++ ) {
view[ ix ] = re + i;
view[ ix+1 ] = im;
ix += strideX;
}
return x;
}
// EXPORTS //
module.exports = zunitspace;
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