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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 gleftPadEdge = require( '@stdlib/blas/ext/base/gleft-pad-edge' ).ndarray;
var grightPadEdge = require( '@stdlib/blas/ext/base/gright-pad-edge' ).ndarray;
// MAIN //
/**
* Pads a strided array by repeating leading and trailing edge elements.
*
* @param {PositiveInteger} N - number of indexed elements in `x`
* @param {integer} j - number of elements to pad on the leading edge
* @param {integer} k - number of elements to pad on the trailing edge
* @param {Collection} x - input array
* @param {integer} strideX - stride length for `x`
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {Collection} y - output array
* @param {integer} strideY - stride length for `y`
* @param {NonNegativeInteger} offsetY - starting index for `y`
* @returns {Collection} output array
*
* @example
* var x = [ 1.0, 2.0, 3.0, 4.0 ];
* var y = [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ];
*
* gpadEdge( 4, 1, 1, x, 1, 0, y, 1, 0 );
* // y => [ 1.0, 1.0, 2.0, 3.0, 4.0, 4.0 ]
*/
function gpadEdge( N, j, k, x, strideX, offsetX, y, strideY, offsetY ) {
if ( N <= 0 ) {
return y;
}
if ( j < 0 ) {
j = 0;
}
if ( k < 0 ) {
k = 0;
}
gleftPadEdge( N, j, x, strideX, offsetX, y, strideY, offsetY );
grightPadEdge( N, k, x, strideX, offsetX, y, strideY, offsetY + ( j * strideY ) ); // eslint-disable-line max-len
return y;
}
// EXPORTS //
module.exports = gpadEdge;
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