| /* |
| Copyright (c) 2004-2009, The Dojo Foundation All Rights Reserved. |
| Available via Academic Free License >= 2.1 OR the modified BSD license. |
| see: http://dojotoolkit.org/license for details |
| */ |
| |
| |
| if(!dojo._hasResource["dojox.math._base"]){ |
| dojo._hasResource["dojox.math._base"]=true; |
| dojo.provide("dojox.math._base"); |
| dojo.mixin(dojox.math,{degreesToRadians:function(n){ |
| return (n*Math.PI)/180; |
| },radiansToDegrees:function(n){ |
| return (n*180)/Math.PI; |
| },factorial:function(n){ |
| if(n===0){ |
| return 1; |
| }else{ |
| if(n<0||Math.floor(n)!=n){ |
| return NaN; |
| } |
| } |
| var _4=1; |
| for(var i=1;i<=n;i++){ |
| _4*=i; |
| } |
| return _4; |
| },permutations:function(n,k){ |
| if(n==0||k==0){ |
| return 1; |
| } |
| return this.factorial(n)/this.factorial(n-k); |
| },combinations:function(n,r){ |
| if(n==0||r==0){ |
| return 1; |
| } |
| return this.factorial(n)/(this.factorial(n-r)*this.factorial(r)); |
| },bernstein:function(t,n,i){ |
| return this.combinations(n,i)*Math.pow(t,i)*Math.pow(1-t,n-i); |
| },gaussian:function(){ |
| var k=2; |
| do{ |
| var i=2*Math.random()-1; |
| var j=2*Math.random()-1; |
| k=i*i+j*j; |
| }while(k>=1); |
| return i*Math.sqrt((-2*Math.log(k))/k); |
| },sd:function(a){ |
| return Math.sqrt(this.variance(a)); |
| },variance:function(a){ |
| var _12=0,_13=0; |
| dojo.forEach(a,function(_14){ |
| _12+=_14; |
| _13+=Math.pow(_14,2); |
| }); |
| return (_13/a.length)-Math.pow(_12/a.length,2); |
| },range:function(a,b,_17){ |
| if(arguments.length<2){ |
| b=a,a=0; |
| } |
| var _18=[],s=_17||1,i; |
| if(s>0){ |
| for(i=a;i<b;i+=s){ |
| _18.push(i); |
| } |
| }else{ |
| if(s<0){ |
| for(i=a;i>b;i+=s){ |
| _18.push(i); |
| } |
| }else{ |
| throw new Error("dojox.math.range: step must not be zero."); |
| } |
| } |
| return _18; |
| },distance:function(a,b){ |
| return Math.sqrt(Math.pow(b[0]-a[0],2)+Math.pow(b[1]-a[1],2)); |
| },midpoint:function(a,b){ |
| if(a.length!=b.length){ |
| console.error("dojox.math.midpoint: Points A and B are not the same dimensionally.",a,b); |
| } |
| var m=[]; |
| for(var i=0;i<a.length;i++){ |
| m[i]=(a[i]+b[i])/2; |
| } |
| return m; |
| }}); |
| } |
