getSampleArray.js

/*
 * Copyright (c) 2015, University of California, Berkeley
 * All rights reserved.
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 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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// Author: Liang Gong

/*
	This is a random array generator
*/

(function () {
	var fs = require('fs');
	// 10% sampling rate
	var random_sampling_rate = 0.1;
	var sample_array_len = 100000;
	var minItems = 2000;
	if(process.argv[2]) {
		random_sampling_rate = parseFloat(process.argv[2]);
	}
	var sample_count_array = [];
	var count = 1;
	for (var i=0;i<sample_array_len || sample_count_array.length < minItems;i++) {
		if(Math.random() < random_sampling_rate) {
			sample_count_array.push(count);
			count = 1;
		} else {
			count++;
		}
	}
	//console.log(sample_count_array);
	console.log('Total Number of Counts: ' + sample_count_array.length);
	var fileLocation = 'exp/hybrid_sampling_exp/patch/sample_0.1.json';
	fs.writeFileSync(fileLocation, JSON.stringify(sample_count_array));
	console.log('Sample array json file has been saved to: ' + fileLocation);
})();