// wink-distance
// Distance functions for Bag of Words, Strings,
// Vectors and more.
//
// Copyright (C) GRAYPE Systems Private Limited
//
// This file is part of “wink-distance”.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
/* eslint-disable no-bitwise */
// ## vector
// ### taxicab
/**
*
* Computes the taxicab or manhattan distance between two vectors of identical
* length.
*
* @method vector.taxicab
* @param {number} va the first vector.
* @param {number} vb the second vector.
* @return {number} taxicab distance between `va` and `vb`.
*
* @example
* taxicab( [ 0, 0 ], [ 6, 6 ] );
* // -> 12
*/
var taxicab = function ( va, vb ) {
var imax;
if ( (imax = va.length) !== vb.length ) {
throw Error( 'wink-distance: taxicab requires identical lenght input vectors.' );
}
// Initialize taxicab distance.
var distance = 0;
// Compute taxicab distance.
for ( var i = 0; i < imax; i += 1 ) distance += Math.abs( va[ i ] - vb[ i ] );
return distance;
}; // taxicab()
module.exports = taxicab;