Press n or j to go to the next uncovered block, b, p or k for the previous block.
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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 //
/**
* Returns the index of the n-th occurrence of a specified search element in a single-precision complex floating-point strided array using alternative indexing semantics.
*
* ## Notes
*
* - If the function is unable to find the n-th occurrence of a search element, the function returns `-1`.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {PositiveInteger} k - occurrence number
* @param {Complex64} searchElement - search element
* @param {Complex64Array} x - input array
* @param {integer} strideX - stride length
* @param {NonNegativeInteger} offsetX - starting index
* @returns {integer} index
*
* @example
* var Complex64Array = require( '@stdlib/array/complex64' );
* var Complex64 = require( '@stdlib/complex/float32/ctor' );
*
* var x = new Complex64Array( [ 1.0, 2.0, 3.0, 4.0, 1.0, 2.0 ] );
*
* var idx = cnthIndexOf( x.length, 2, new Complex64( 1.0, 2.0 ), x, 1, 0 );
* // returns 2
*/
function cnthIndexOf( N, k, searchElement, x, strideX, offsetX ) {
var count;
var view;
var re;
var im;
var ix;
var i;
if ( N <= 0 || k <= 0 ) {
return -1;
}
// Decompose the search element into its real and imaginary components:
re = realf( searchElement );
im = imagf( searchElement );
// 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;
count = 0;
for ( i = 0; i < N; i++ ) {
if ( view[ ix ] === re && view[ ix+1 ] === im ) {
count += 1;
if ( count === k ) {
return i;
}
}
ix += strideX;
}
return -1;
}
// EXPORTS //
module.exports = cnthIndexOf;
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