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 stride2offset = require( '@stdlib/strided/base/stride2offset' );
var ndarray = require( './ndarray.js' );
// MAIN //
/**
* Sorts a strided array using heapsort according to a provided callback function.
*
* ## Notes
*
* - This implementation uses an in-place algorithm derived from the work of Floyd (1964).
*
* ## References
*
* - Williams, John William Joseph. 1964. "Algorithm 232: Heapsort." _Communications of the ACM_ 7 (6). New York, NY, USA: Association for Computing Machinery: 347–49. doi:[10.1145/512274.512284](https://doi.org/10.1145/512274.512284).
* - Floyd, Robert W. 1964. "Algorithm 245: Treesort." _Communications of the ACM_ 7 (12). New York, NY, USA: Association for Computing Machinery: 701. doi:[10.1145/355588.365103](https://doi.org/10.1145/355588.365103).
*
* @param {PositiveInteger} N - number of indexed elements
* @param {NumericArray} x - input array
* @param {integer} strideX - stride length
* @param {Callback} clbk - callback function
* @param {*} [thisArg] - execution context
* @returns {NumericArray} input array
*
* @example
* var x = [ 1.0, -2.0, 3.0, -4.0 ];
*
* function fcn( a, b ) {
* if ( a < b ) {
* return -1;
* }
* if ( a > b ) {
* return 1;
* }
* return 0;
* }
*
* gsorthpBy( x.length, x, 1, fcn );
* // x => [ -4.0, -2.0, 1.0, 3.0 ]
*/
function gsorthpBy( N, x, strideX, clbk ) {
var thisArg;
if ( arguments.length > 4 ) {
thisArg = arguments[ 4 ];
}
return ndarray( N, x, strideX, stride2offset( N, strideX ), clbk, thisArg );
}
// EXPORTS //
module.exports = gsorthpBy;
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