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* @license Apache-2.0
*
* Copyright (c) 2020 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 floor = require( '@stdlib/math/base/special/floor' );
// MAIN //
/**
* Computes the median value of 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 value
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var x = new Float64Array( [ 2.0, -3.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0 ] );
*
* var v = dmedianSorted( 4, x, 2, 1 );
* // returns 0.0
*/
function dmedianSorted( N, x, strideX, offsetX ) {
var n;
var m;
if ( N <= 0 ) {
return NaN;
}
n = N / 2;
m = floor( n );
if ( n === m ) {
// Even number of elements...
return ( x[ offsetX+(m*strideX) ] + x[ offsetX+((m-1)*strideX) ] ) / 2.0; // eslint-disable-line max-len
}
// Odd number of elements...
return x[ offsetX+(m*strideX) ];
}
// EXPORTS //
module.exports = dmedianSorted;
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