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javascript自然分類法演算法實現代碼

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複製代碼 代碼如下:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=7, IE=9, IE=10">
<meta name="viewport"
content="initial-scale=1, maximum-scale=1,user-scalable=no">
<title>自然分類法演算法</title>
<script>
function getJenksBreaks(data,numclass) {
function sortNumber(a,b)//在javascript裡，Array的sort方法，必須用這個函數，否則不是按數字大小排序
{
return a - b
}
// int numclass;
var numdata = data.length;
data.sort(sortNumber); //先排序

var mat1=new Array();
var mat2=new Array();
var st=new Array();

for (var j = 0; j <= numdata; j++){
mat1[j]=new Array();
mat2[j]=new Array();
st[j]=0;
for(var i=0;i<=numclass;i++){
mat1[j][i]=0;
mat2[j][i]=0;
}
}

for (var i = 1; i <= numclass; i++) {
mat1[1][i] = 1;
mat2[1][i] = 0;
for (var j = 2; j <= numdata; j++){

mat2[j][i]=Number.MAX_VALUE;
}
}
var v=0;

for (var l = 2; l <= numdata; l++) {
var s1=0;
var s2=0;
var w=0;
var i3=0;
for (var m = 1; m <= l; m++) {
i3 = l - m + 1;

var val=parseInt(data[i3-1]);

s2 += val * val;
s1 += val;

w++;
v = s2 - (s1 * s1) / w;
var i4 = i3 - 1;
if (i4 != 0) {
for (var j = 2; j <= numclass; j++) {
if (mat2[l][j] >= (v + mat2[i4][j - 1])) {
mat1[l][j] = i3;
mat2[l][j] = v + mat2[i4][j - 1];

if(l==200&&j==5) alert("l="+200+",j="+5+";mat2[200][5]="+mat1[l][j]+"i3="+i3);
}
}
}
}

mat1[l][1] = 1;
mat2[l][1] = v;
}

var k = numdata;
var kclass=new Array();

/* int[] kclass = new int[numclass]; */
kclass[numclass - 1] = parseInt(data[data.length-1]);
/* kclass[numclass - 1] = (Integer) data.get(data.size() - 1); */

for (var j = numclass; j >= 2; j--) {
var id = parseInt(mat1[k][j]) - 2;
kclass[j - 2] = parseInt( data[id]);
k = parseInt( mat1[k][j] - 1);
}

return kclass;
}

function doit(){
var data = new Array( 9, 9, 9, 9, 8, 1, 9, 7, 6, 7, 10, 7, 7, 8, 5, 7, 8, 2,
6, 6, 9, 10, 2, 2, 3, 9, 9, 1, 9, 1, 6, 7, 1, 9, 6, 5, 2, 8, 6,
6, 6, 4, 1, 4, 10, 9, 6, 9, 9, 7, 10, 9, 6, 6, 6, 9, 3, 2, 5,
10, 3, 9, 6, 1, 2, 1, 2, 7, 5, 2, 6, 6, 2, 7, 9, 9, 5, 4, 6, 4,
1, 1, 5, 1, 4, 4, 2, 6, 9, 7, 3, 10, 4, 4, 9, 5, 5, 3, 5, 3,
161, 136, 22, 113, 48, 114, 166, 33, 159, 182, 135, 22, 174,
191, 60, 176, 1, 155, 62, 142, 185, 84, 140, 27, 111, 176, 189,
24, 60, 29, 139, 20, 70, 172, 90, 120, 121, 173, 57, 138, 86,
180, 143, 155, 35, 10, 136, 158, 26, 29, 136, 97, 193, 194,
104, 147, 182, 44, 84, 139, 176, 16, 130, 168, 109, 182, 87,
78, 115, 75, 32, 88, 131, 168, 89, 25, 160, 60, 72, 92, 129,
159, 99, 5, 192, 6, 53, 15, 62, 176, 73, 129, 128, 34, 190, 95,
19, 19, 196, 30 );

/* var list = new Array();
for(int i = 0; i < data.length; i++){
list.add(data[i]);
} */
//Collections.sort(list);
var text=document.getElementById("text");
text.value="";
var grade = getJenksBreaks(data, 5);
for (var i = 0; i < grade.length; i++)
text.value=text.value+grade[i]+",";

}

</script>
</head>

<body >
<button type="button"onclick="doit()">自然分類法</button>

<input id="text"></input>
</body>
</html>

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