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matrix.js
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matrix.js
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var random = require('./random');
function gcd(a,b){
while(a!==b){
if(a<b){
b = b-a;
}else{
a = a-b;
}
}
return a;
};
function gcdnormalized(arry){
if(!arry){
throw 'No weights';
}
var l = arry.length;
if(!l){
throw 'No weights';
}
if(l<2){
return arry[1];
}
var d = gcd(arry[0],arry[1]);
for(var i=2; i<l; i++){
d = gcd(d,arry[i]);
}
if(d>1){
var ret = [];
for(var i=0; i<l; i++){
ret.push(arry[i]/d);
}
return ret;
}
return arry;
};
function Matrix(rows,cols,symbolweights){
if(!(rows&&cols&&symbolweights)){
return;
}
this.rows = rows;
this.cols = cols;
this.weights = gcdnormalized(symbolweights);
var map = [];
var genlen = 0;
for(var i=0; i<this.weights.length; i++){
var w = this.weights[i];
for(var j=0; j<w; j++){
map.push(i);
}
genlen+=this.weights[i];
}
this.genlen = genlen;
this.map = map;
}
Matrix.prototype.generate = function generate(){
var retlen = this.rows*this.cols;
var genlen = this.genlen;
var map = this.map;
var ret = [];
for(var i=0; i<retlen; i++){
ret.push(map[random(genlen)]);
}
return ret;
};
module.exports = Matrix;