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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-complex64' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );
// MAIN //
/**
* Replaces single-precision complex floating-point strided array elements equal to a provided search element with a specified scalar constant using alternative indexing semantics.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Complex64} searchElement - search element
* @param {Complex64} alpha - scalar constant
* @param {Complex64Array} x - input array
* @param {integer} strideX - stride length
* @param {NonNegativeInteger} offsetX - starting index
* @returns {Complex64Array} input array
*
* @example
* var Complex64Array = require( '@stdlib/array/complex64' );
* var Complex64 = require( '@stdlib/complex/float32/ctor' );
*
* var x = new Complex64Array( [ 1.0, 2.0, 0.0, 0.0, 3.0, 4.0, 0.0, 0.0 ] );
* var searchElement = new Complex64( 0.0, 0.0 );
* var alpha = new Complex64( 5.0, 5.0 );
*
* cfillEqual( x.length, searchElement, alpha, x, 1, 0 );
* // x => <Complex64Array>[ 1.0, 2.0, 5.0, 5.0, 3.0, 4.0, 5.0, 5.0 ]
*/
function cfillEqual( N, searchElement, alpha, x, strideX, offsetX ) {
var view;
var sre;
var sim;
var re;
var im;
var ix;
var i;
if ( N <= 0 ) {
return x;
}
// Decompose the search element into its real and imaginary components:
sre = realf( searchElement );
sim = imagf( searchElement );
// Decompose the constant into its real and imaginary components:
re = realf( alpha );
im = imagf( alpha );
// Reinterpret the complex input array as a real-valued array of interleaved real and imaginary components:
view = reinterpret( x, 0 );
// Adjust the stride and offset to account for the interleaved storage:
ix = offsetX * 2;
strideX *= 2;
for ( i = 0; i < N; i++ ) {
if ( view[ ix ] === sre && view[ ix+1 ] === sim ) {
view[ ix ] = re;
view[ ix+1 ] = im;
}
ix += strideX;
}
return x;
}
// EXPORTS //
module.exports = cfillEqual;
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