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';
// MODULES //
var abs = require( '@stdlib/math/base/special/abs' );
var isnan = require( '@stdlib/math/base/assert/is-nan' );
var dmediansorted = require( '@stdlib/stats/strided/dmediansorted' );
// MAIN //
/**
* Compares two numbers in ascending order.
*
* @private
* @param {number} a - first number
* @param {number} b - second number
* @returns {number} comparison value
*/
function ascending( a, b ) {
return a - b;
}
/**
* Computes the median absolute deviation for a sorted double-precision floating-point strided array.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Float64Array} x - sorted input array
* @param {integer} strideX - stride length
* @param {NonNegativeInteger} offsetX - starting index
* @returns {number} median absolute deviation
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
*
* var v = dmadsorted( x.length, x, 1, 0 );
* // returns 1.0
*/
function dmadsorted( N, x, strideX, offsetX ) {
var median;
var diffs;
var i;
if ( N <= 0 ) {
return NaN;
}
median = dmediansorted.ndarray( N, x, strideX, offsetX );
if ( isnan(median) ) {
return NaN;
}
diffs = [];
for (i = 0; i < N; i++) {
diffs.push(abs(x[offsetX + (i * strideX)] - median));
}
diffs.sort( ascending );
return dmediansorted.ndarray( N, diffs, 1, 0 );
}
// EXPORTS //
module.exports = dmadsorted;
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