javascript - Error with force cluster layout d3 -


i'm trying graph example: http://bl.ocks.org/mbostock/1747543 problem have when execute html, there error says:

syntaxerror: expected expression, got '.'

my code is:

var width = 900,     height = 500;  var color = d3.scale.category20();  var force = d3.layout.force()     .gravity(.1)     .charge(-120)     .linkdistance(30)     .size([width, height]);  var svg = d3.select("body").select('#contenedor').select('#contenido').append("svg")     .attr("width", width)     .attr("height", height); d3.json("fisica_noms.json", function(error, graph) {   if (error) throw error; var clusters = [] var getcolors = function(category){     var nods = graph.nodes;     var subs = [];     var m = {};     (var ele in nods){         for(var categs in ele){             if (!m[categs] && categs == category){                 m[categs] = true;                 subs.push(categs);                 };             };         };         return subs;     };  var samecategory = function(category,subcategory){     var nods = graph.nodes;     var subs = [];     for(var i=0; i<nods.length;i++){             if(nods[i][category]===subcategory){                 subs.push(nods[i])};        };        return subs        };  var searchclusters = function(){     var nods = graph.nodes;     var ncom = getcolors('comunitat').length;      for(var i=0; i<ncom;i++){         clusters.push(samecategory('comunitat',i));         clusters[i] = d3.max(clusters[i], function(d) {return d.degree;});     }; force       .nodes(graph.nodes)       .links(graph.links)       .start();    var link = svg.selectall(".link")       .data(graph.links)     .enter().append("line")       .attr("class", "link")       .style("weight", function(d) { return math.sqrt(d.value); }); force.linkstrength(function(link){return link.value}) ;   var node = svg.selectall(".node")       .data(graph.nodes)     .enter().append("circle")       .attr("class", "node")       .attr("r", function(d){return d.degree/60})       .style("fill", function(d) { return color(d.comunitat); })       .call(force.drag)       .on('click',function(d){showinfo(d);});   node.append("title")       .text(function(d) { return d.id; });     force.on("tick",tick);    function tick (e) {     link.attr("x1", function(d) { return d.source.x; })         .attr("y1", function(d) { return d.source.y; })         .attr("x2", function(d) { return d.target.x; })         .attr("y2", function(d) { return d.target.y; });     console.log(e);     node.attr("cx", function(d) { return d.x; })         .attr("cy", function(d) { return d.y; });         .each(cluster(10 * e.alpha * e.alpha))   };      // move d adjacent cluster node.     function cluster(alpha) {       return function(d) {         var cluster = clusters[d.comunitat];         if (cluster === d) return;         var x = d.x - cluster.x,             y = d.y - cluster.y,             l = math.sqrt(x * x + y * y),             r = d.degree/60 + cluster.degree/60;         if (l != r) {           l = (l - r) / l * alpha;           d.x -= x *= l;           d.y -= y *= l;           cluster.x += x;           cluster.y += y;         }       };     }  });  }; 

the console says error here:

.each(cluster(10 * e.alpha * e.alpha)) 


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