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javascript自然分類法算法實(shí)現(xiàn)代碼

更新時(shí)間：2013年10月11日 16:43:20 作者：

這篇文章介紹了javascript自然分類法算法實(shí)現(xiàn)代碼，有需要的朋友可以參考一下

<!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>自然分類法算法</title>
<script>
function getJenksBreaks(data,numclass) {
function sortNumber(a,b)//在javascript里，Array的sort方法，必須用這個(gè)函數(shù)，否則不是按數(shù)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>