/*

* jsArrayStats

* A javascript library to gets statistics from an Array or Object (Associative Array)

* Copyright 2011, Netdesign di Fabio Buda (http://www.netd.it)

* Dual licensed under the MIT or GPL Version 2 licenses.

*

* 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 LIABILITY, WHETHER IN AN ACTION

* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

function arrayStats(array){

//this code is a little Ugly, work to make it better and lighter

var obj = this;

if(typeof(array) != "undefined"){

this.array = array;

this.length = array.length;

this.type = null;

} else {

this.length = 0;

this.type = null;

}

this.mean = mean;

this.geometricMean = geometricMean;

this.harmonicMean = harmonicMean;

this.maxValue = maxValue;

this.precision = 2;

this.setArray = setArray;

setArray(obj.array);

function setArray(arr){

obj.array = arr;

if (arr instanceof Array) {

obj.type = "Array";

obj.length = arr.length;

//print("detected as Array"); //v8 debugging

//print(this.length);

} else if (arr instanceof Object){

obj.length = 0;

obj.type = "Object";

obj.mean = objMean;

obj.geometricMean = objGeometricMean;

obj.harmonicMean = objHarmonicMean;

//print(this.length);

//print("detected as Obj"); //v8 debugging

} else { return false; }

}

function mean(){

var thisTotal = 0;

for(var i = this.length-1; i >= 0; i--){

thisTotal += this.array[i];

}

return((thisTotal/this.length).toFixed(this.precision));

};

function geometricMean(){

var thisTotal = 1;

for(var i = this.length-1; i >= 0; i--){

thisTotal *= this.array[i];

}

return((Math.pow(thisTotal, 1/this.length)).toFixed(this.precision));

};

function harmonicMean(){

var thisTotal = 0;

for(var i = this.length-1; i >= 0; i--){

thisTotal += 1/this.array[i];

}

return((this.length/thisTotal).toFixed(this.precision));

};

function maxValue(){

var out = new Object();

out.value = Math.max.apply( Math, obj.array );

out.index = obj.array.indexOf(out.value);

return out;

}

function objMean(){

var thisTotal = 0;

this.length = 0;

for(var key in this.array){

this.length += 1;

thisTotal += this.array[key];

}

return((thisTotal/this.length).toFixed(this.precision));

};

function objGeometricMean(){

var thisTotal = 1;

this.length = 0;

for(var key in this.array){

this.length += 1;

thisTotal *= this.array[key];

}

return((Math.pow(thisTotal, 1/this.length)).toFixed(this.precision));

};

function objHarmonicMean(){

var thisTotal = 0;

this.length = 0;

for(var key in this.array){

this.length += 1;

thisTotal += 1/this.array[key];

}

return((this.length/thisTotal).toFixed(this.precision));

};

}

var arrayStats = new arrayStats();