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Struts example source code file (math.js)

This example Struts source code file (math.js) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Struts tags/keywords

error, error

The Struts math.js source code

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/



dojo.provide("dojo.math");
dojo.math.degToRad = function (x) {
	return (x * Math.PI) / 180;
};
dojo.math.radToDeg = function (x) {
	return (x * 180) / Math.PI;
};
dojo.math.factorial = function (n) {
	if (n < 1) {
		return 0;
	}
	var retVal = 1;
	for (var i = 1; i <= n; i++) {
		retVal *= i;
	}
	return retVal;
};
dojo.math.permutations = function (n, k) {
	if (n == 0 || k == 0) {
		return 1;
	}
	return (dojo.math.factorial(n) / dojo.math.factorial(n - k));
};
dojo.math.combinations = function (n, r) {
	if (n == 0 || r == 0) {
		return 1;
	}
	return (dojo.math.factorial(n) / (dojo.math.factorial(n - r) * dojo.math.factorial(r)));
};
dojo.math.bernstein = function (t, n, i) {
	return (dojo.math.combinations(n, i) * Math.pow(t, i) * Math.pow(1 - t, n - i));
};
dojo.math.gaussianRandom = function () {
	var k = 2;
	do {
		var i = 2 * Math.random() - 1;
		var j = 2 * Math.random() - 1;
		k = i * i + j * j;
	} while (k >= 1);
	k = Math.sqrt((-2 * Math.log(k)) / k);
	return i * k;
};
dojo.math.mean = function () {
	var array = dojo.lang.isArray(arguments[0]) ? arguments[0] : arguments;
	var mean = 0;
	for (var i = 0; i < array.length; i++) {
		mean += array[i];
	}
	return mean / array.length;
};
dojo.math.round = function (number, places) {
	if (!places) {
		var shift = 1;
	} else {
		var shift = Math.pow(10, places);
	}
	return Math.round(number * shift) / shift;
};
dojo.math.sd = dojo.math.standardDeviation = function () {
	var array = dojo.lang.isArray(arguments[0]) ? arguments[0] : arguments;
	return Math.sqrt(dojo.math.variance(array));
};
dojo.math.variance = function () {
	var array = dojo.lang.isArray(arguments[0]) ? arguments[0] : arguments;
	var mean = 0, squares = 0;
	for (var i = 0; i < array.length; i++) {
		mean += array[i];
		squares += Math.pow(array[i], 2);
	}
	return (squares / array.length) - Math.pow(mean / array.length, 2);
};
dojo.math.range = function (a, b, step) {
	if (arguments.length < 2) {
		b = a;
		a = 0;
	}
	if (arguments.length < 3) {
		step = 1;
	}
	var range = [];
	if (step > 0) {
		for (var i = a; i < b; i += step) {
			range.push(i);
		}
	} else {
		if (step < 0) {
			for (var i = a; i > b; i += step) {
				range.push(i);
			}
		} else {
			throw new Error("dojo.math.range: step must be non-zero");
		}
	}
	return range;
};

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