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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.
*/
/* eslint-disable max-params, max-len */
'use strict';
// MODULES //
var gcopy = require( '@stdlib/blas/base/gcopy' ).ndarray;
var base = require( './base.js' );
// MAIN //
/**
* Calculates the differences between consecutive elements of a strided array using alternative indexing semantics.
*
* @param {NonNegativeInteger} N - number of indexed elements
* @param {NumericArray} x - input array
* @param {integer} strideX - stride length for `x`
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {NonNegativeInteger} N1 - number of indexed elements to prepend
* @param {NumericArray} prepend - prepend array
* @param {integer} strideP - stride length for `prepend`
* @param {NonNegativeInteger} offsetP - starting index for `prepend`
* @param {NonNegativeInteger} N2 - number of indexed elements to append
* @param {NumericArray} append - append array
* @param {integer} strideA - stride length for `append`
* @param {NonNegativeInteger} offsetA - starting index for `append`
* @param {NumericArray} out - output array
* @param {integer} strideOut - stride length for `out`
* @param {NonNegativeInteger} offsetOut - starting index for `out`
* @returns {NumericArray} output array
*
* @example
* var x = [ 2.0, 4.0, 7.0, 11.0, 16.0 ];
* var p = [ 1.0 ];
* var a = [ 22.0 ];
* var out = [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ];
*
* gediff( x.length, x, 1, 0, 1, p, 1, 0, 1, a, 1, 0, out, 1, 0 );
* // out => [ 1.0, 2.0, 3.0, 4.0, 5.0, 22.0 ]
*/
function gediff( N, x, strideX, offsetX, N1, prepend, strideP, offsetP, N2, append, strideA, offsetA, out, strideOut, offsetOut ) {
var total;
var io;
total = N + N1 + N2;
if ( total <= 1 ) {
return out;
}
// Copy `prepend` into output array:
gcopy( N1, prepend, strideP, offsetP, out, strideOut, offsetOut );
// Compute differences of input array:
io = offsetOut + ( N1 * strideOut );
base( N, x, strideX, offsetX, out, strideOut, io );
if ( N > 0 ) {
io += ( N-1 ) * strideOut;
}
// Copy `append` into output array:
gcopy( N2, append, strideA, offsetA, out, strideOut, io );
return out;
}
// EXPORTS //
module.exports = gediff;
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