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';
// MAIN //
/**
* Prepends elements to a single-precision floating-point strided array by circularly repeating existing elements.
*
* @param {PositiveInteger} N - number of indexed elements in `x`
* @param {integer} k - number of elements to pad
* @param {Float32Array} x - input array
* @param {integer} strideX - stride length for `x`
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {Float32Array} y - output array
* @param {integer} strideY - stride length for `y`
* @param {NonNegativeInteger} offsetY - starting index for `y`
* @returns {Float32Array} output array
*
* @example
* var Float32Array = require( '@stdlib/array/float32' );
*
* var x = new Float32Array( [ 1.0, 2.0, 3.0 ] );
* var y = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );
*
* sleftPadCircular( 3, 2, x, 1, 0, y, 1, 0 );
* // y => <Float32Array>[ 2.0, 3.0, 1.0, 2.0, 3.0 ]
*/
function sleftPadCircular( N, k, x, strideX, offsetX, y, strideY, offsetY ) {
var ix;
var iy;
var M;
var i;
var j;
if ( N <= 0 ) {
return y;
}
if ( k < 0 ) {
k = 0;
}
// Resolve the index of the first element in the left padding:
j = k % N;
if ( j > 0 ) {
j = N - j;
}
M = N + k;
ix = offsetX + ( j * strideX );
iy = offsetY;
for ( i = 0; i < M; i++ ) {
y[ iy ] = x[ ix ];
iy += strideY;
j += 1;
if ( j === N ) {
j = 0;
ix = offsetX;
} else {
ix += strideX;
}
}
return y;
}
// EXPORTS //
module.exports = sleftPadCircular;
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