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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 zcopy = require( '@stdlib/blas/base/zcopy' ).ndarray;
var reinterpret = require( '@stdlib/strided/base/reinterpret-complex128' );
// MAIN //
/**
* Calculates the differences between consecutive elements of a double-precision complex floating-point strided array using alternative indexing semantics.
*
* @param {NonNegativeInteger} N - number of indexed elements
* @param {Complex128Array} 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 {Complex128Array} 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 {Complex128Array} append - append array
* @param {integer} strideA - stride length for `append`
* @param {NonNegativeInteger} offsetA - starting index for `append`
* @param {Complex128Array} out - output array
* @param {integer} strideOut - stride length for `out`
* @param {NonNegativeInteger} offsetOut - starting index for `out`
* @returns {Complex128Array} output array
*
* @example
* var Complex128Array = require( '@stdlib/array/complex128' );
*
* var x = new Complex128Array( [ 2.0, -2.0, 4.0, -4.0, 6.0, -6.0, 8.0, -8.0, 10.0, -10.0 ] );
* var p = new Complex128Array( [ 1.0, -1.0 ] );
* var a = new Complex128Array( [ 11.0, -11.0 ] );
* var out = new Complex128Array( 6 );
*
* zediff( x.length, x, 1, 0, 1, p, 1, 0, 1, a, 1, 0, out, 1, 0 );
* // out => <Complex128Array>[ 1.0, -1.0, 2.0, -2.0, 2.0, -2.0, 2.0, -2.0, 2.0, -2.0, 11.0, -11.0 ]
*/
function zediff( N, x, strideX, offsetX, N1, prepend, strideP, offsetP, N2, append, strideA, offsetA, out, strideOut, offsetOut ) {
var rprev;
var iprev;
var rcurr;
var icurr;
var total;
var ioOut;
var xv;
var ov;
var sx;
var so;
var ix;
var io;
var i;
total = N + N1 + N2;
if ( total <= 1 ) {
return out;
}
// Copy `prepend` into output array:
zcopy( N1, prepend, strideP, offsetP, out, strideOut, offsetOut );
// Reinterpret the complex arrays as real-valued arrays of interleaved real and imaginary components:
xv = reinterpret( x, 0 );
ov = reinterpret( out, 0 );
// Adjust the strides and offsets according to the real-valued arrays:
sx = strideX * 2;
so = strideOut * 2;
ix = offsetX * 2;
ioOut = offsetOut + ( N1 * strideOut );
io = ioOut * 2;
// Compute differences of input array:
rprev = xv[ ix ];
iprev = xv[ ix+1 ];
for ( i = 1; i < N; i++ ) {
ix += sx;
rcurr = xv[ ix ];
icurr = xv[ ix+1 ];
ov[ io ] = rcurr - rprev;
ov[ io+1 ] = icurr - iprev;
rprev = rcurr;
iprev = icurr;
io += so;
ioOut += strideOut;
}
// Copy `append` into output array:
zcopy( N2, append, strideA, offsetA, out, strideOut, ioOut );
return out;
}
// EXPORTS //
module.exports = zediff;
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