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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 //
/**
* Computes the gradient of a strided array.
*
* ## Notes
*
* - The function supports first-order (i.e., `edgeOrder = 1`) and second-order (i.e., `edgeOrder = 2`) finite-difference approximations at the boundaries.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {PositiveInteger} edgeOrder - approximation order at the boundaries
* @param {NumericArray} x - input array
* @param {integer} strideX - stride length for `x`
* @param {NumericArray} h - spacing array
* @param {integer} strideH - stride length for `h`
* @param {NumericArray} out - output array
* @param {integer} strideOut - stride length for `out`
* @returns {NumericArray} output array
*
* @example
* var x = [ 0.0, 1.0, 9.0, 36.0, 100.0 ];
* var h = [ 1.0, 2.0, 3.0, 4.0 ];
* var out = [ 0.0, 0.0, 0.0, 0.0, 0.0 ];
*
* ggradient( x.length, 1, x, 1, h, 1, out, 1 );
* // out => [ 1.0, 2.0, 6.0, 12.0, 16.0 ]
*/
function ggradient( N, edgeOrder, x, strideX, h, strideH, out, strideOut ) {
return ndarray( N, edgeOrder, x, strideX, stride2offset( N, strideX ), h, strideH, stride2offset( N-1, strideH ), out, strideOut, stride2offset( N, strideOut ) ); // eslint-disable-line max-len
}
// EXPORTS //
module.exports = ggradient;
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