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Time circular mean calculation
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/** | |
* Created by ffarias on 2/4/14. | |
*/ | |
var meanTimeOfDay = | |
{ | |
timeToDegrees: function (datetime) { | |
return (360 * datetime.getHours() / 24.0 + 360 * datetime.getMinutes() / (24 * 60.) + 360 * datetime.getSeconds() / (24 * 3600.0)); | |
}, | |
timeFromDegrees: function (angle) { | |
var time = {}; | |
var totalSeconds = 24 * 60 * 60 * angle / 360; | |
time.seconds = Math.floor(totalSeconds % 60); | |
time.minutes = Math.floor((totalSeconds % 3600 - time.seconds) / 60); | |
time.hours = Math.floor(totalSeconds / 3600); | |
return time; | |
}, | |
meanAngle: function (angles) { | |
var y_part = 0; | |
var x_part = 0; | |
for (var i=0; i < angles.length; i++) | |
{ | |
x_part += Math.cos(angles[i] * Math.PI / 180); | |
y_part += Math.sin(angles[i] * Math.PI / 180); | |
} | |
return Math.atan2(y_part/angles.length, x_part/angles.length) * 180 / Math.PI; | |
}, | |
// Input hours: 23:00:17 23:40:20 00:12:45 00:17:19 | |
// Expected result: "The mean time is : 23:47:43" | |
calculateMeanTimeOfDay: function (){ | |
var input = [ | |
new Date(2014,2,4,23,0,17), | |
new Date(2014,2,4,23,40,20), | |
new Date(2014,2,5,0,12,45), | |
new Date(2014,2,5,0,17,19) | |
]; | |
var inputOnDegrees = new Array(); | |
for (var i = 0; i < input.length; i++) { | |
inputOnDegrees.push(this.timeToDegrees(input[i])); | |
} | |
var meanTime = this.timeFromDegrees( 360 + this.meanAngle(inputOnDegrees)); | |
console.log('Hours' + meanTime.hours, ' Min' + meanTime.minutes, ' Seconds' + meanTime.seconds); | |
} | |
} | |
meanTimeOfDay.calculateMeanTimeOfDay(); |
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