HTML5僵尸启示录疾病传播SIR微分方程模型

the SIR model for spread of disease the differential equation model

html5, zoombie, 算法

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JavaScript

// VARS START

// Time to simulate: (in days)
var t = 14

// Number of susceptibles:
var s = 0.99

// Number of infected:
var i = 0.01

// Number of removed:
var r = 0

// Chance of becoming infected after being bitten
var a = 01

// Death rate
var b = 1 / 3

// Population size:
var pop = 70000000

// VARS END

var ds = -a * s * i
var di = a * s * i - b * i
var dr = b * i

var run = function(time) {
    var sArray = [s];
    var dsArray = [ds];

var iArray = [i];
    var diArray = [di];

var rArray = [r];
    var drArray = [dr];

for (j = 0; j < time; j++) {

sArray.push(sArray[j] + dsArray[j])
        iArray.push(iArray[j] + diArray[j])
        rArray.push(rArray[j] + drArray[j])

dsArray.push(-a * sArray[j] * iArray[j])
        diArray.push((a * sArray[j] * iArray[j]) + (b * i))
        drArray.push(b * i)

}
    return [sArray, iArray, rArray];
}

function stats(time, pretty) {
    var data = run(time);
    if (pretty == true) {
        if (Math.floor(data[0][time] * pop < 0) || Math.floor(data[1][time] * pop) < 0) {
            console.log('Everybody has been infected/killed.')
        } else {
            console.log("People Left: " + Math.floor(data[0][time] * pop))
            console.log("People Infected: " + Math.floor(data[1][time] * pop))
            console.log("People Dead: " + Math.floor(data[2][time] * pop))
        }
    } else {
        return {
            people: Math.floor(data[0][time] * pop),
            infected: Math.floor(data[1][time] * pop),
            dead: Math.floor(data[2][time] * pop)
        }
    }
}

function returnData(time, type) {
    var data = run(time)
    var specificData = data[type]
    return specificData.map(function(val) {
        return Math.floor(val * pop) / 100
    });
}

$(document).ready(function() {
    if (t % 7 == 0) {
        if (t / 7 == 1) {
            $('.humanity').html('After ' + 1 + ' week')
        } else {
            $('.humanity').html('After ' + t / 7 + ' weeks')
        }
    } else {
        if (t == 1) {
            $('.humanity').html('After ' + 1 + ' day')
        } else {
            $('.humanity').html('After ' + t + ' days')
        }
    }
    $('.infected-num').html(function() {
        if (stats(t, false).infected > pop) {
            $('.days').html('Nobody survived.')
        } else {
            return stats(t, false).infected
        }
    })
});

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the SIR model for spread of disease the differential equation model

html5, zoombie, 算法

编辑器支持Emmet

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the SIR model for spread of disease the differential equation model

html5, zoombie, 算法

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