Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 | 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 2x 2x 7x 7x 7x 7x 7x 7x 7x 7x 9x 18x 18x 18x 18x 18x 18x 7x 7x 7x 7x 7x 9x 3x 3x 3x 3x 3x | /**
* @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 scopy = require( '@stdlib/blas/base/scopy' );
// MAIN //
/**
* Calculates the differences between consecutive elements of a single-precision floating-point strided array using alternative indexing semantics.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Float32Array} x - input array
* @param {integer} strideX - stride length for `x`
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {PositiveInteger} N1 - number of indexed elements of prepend
* @param {Float32Array} prepend - prepend array
* @param {integer} strideP - stride length for `prepend`
* @param {NonNegativeInteger} offsetP - starting index for `prepend`
* @param {PositiveInteger} N2 - number of indexed elements of append
* @param {Float32Array} append - append array
* @param {integer} strideA - stride length for `append`
* @param {NonNegativeInteger} offsetA - starting index for `append`
* @param {Float32Array} out - output array
* @param {integer} strideOut - stride length for `out`
* @param {NonNegativeInteger} offsetOut - starting index for `out`
* @returns {Float32Array} output array
*
* @example
* var Float32Array = require( '@stdlib/array/float32' );
*
* var x = new Float32Array( [ 2.0, 4.0, 7.0, 11.0, 16.0 ] );
* var p = new Float32Array( [ 1.0 ] );
* var a = new Float32Array( [ 22.0 ] );
* var out = new Float32Array( 6 );
*
* sediff( x.length, x, 1, 0, 1, p, 1, 0, 1, a, 1, 0, out, 1, 0 );
*
* console.log( out );
* // out => <Float32Array>[ 1.0, 2.0, 3.0, 4.0, 5.0, 22.0 ]
*/
function sediff( N, x, strideX, offsetX, N1, prepend, strideP, offsetP, N2, append, strideA, offsetA, out, strideOut, offsetOut ) {
var total;
var prev;
var curr;
var ix;
var io;
var i;
total = N + N1 + N2;
if ( total <= 1 ) {
return out;
}
// Copy `prepend` into output array:
scopy.ndarray( N1, prepend, strideP, offsetP, out, strideOut, offsetOut );
// Compute differences of input array:
ix = offsetX;
io = offsetOut + ( N1 * strideOut );
prev = x[ ix ];
for ( i = 1; i < N; i++ ) {
ix += strideX;
curr = x[ ix ];
out[ io ] = curr - prev;
prev = curr;
io += strideOut;
}
// Copy `append` into output array:
scopy.ndarray( N2, append, strideA, offsetA, out, strideOut, io );
return out;
}
// EXPORTS //
module.exports = sediff;
|