D3 Examples - Stacked to grouped

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<!DOCTYPE html>
<style>
​
.axis .domain {
  display: none;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
// Source: https://bl.ocks.org/mbostock/3886208
​
  d3.csv('stocks.csv', function(error, datas) {
    
    var n = 4, // number of samples
    m = 11; // number of series
    
    datasFiltered = {}
    datas.forEach(function(el,index){
      year = +el.date.substr(el.date.length-4);
      if (!datasFiltered[year]) {
            datasFiltered[year] = {}
        datasFiltered[year][el.symbol] = [+el.price]
      }
      else {
        if (!datasFiltered[year][el.symbol]) {
          datasFiltered[year][el.symbol] = [+el.price];
        }
        else {
          datasFiltered[year][el.symbol].push(+el.price);
        }
      }
    });
    
    console.log(datasFiltered,"ici");
    
    datasFinal = []
    for (year in datasFiltered) {
      var temp_array = []
      for (symbol in datasFiltered[year]) {
        var values = datasFiltered[year][symbol]
        var mean_values = values.reduce(function(a, b) { return a + b; })/ values.length;
        temp_array.push(mean_values);
      }
      datasFinal.push(temp_array);
    }
    
    
    var data = d3.range(m).map(function() { 
      return d3.range(n).map(Math.random); 
    });
​
    var margin = {top: 20, right: 30, bottom: 30, left: 40},
        width = 960 - margin.left - margin.right,
        height = 500 - margin.top - margin.bottom;
​
    
var y = d3.scaleLinear()
    .domain([0, d3.max(datasFinal.map(function(el){return d3.sum(el)}))])
    .rangeRound([height, 0])
        .nice();
​
var x = d3.scaleBand()
    .rangeRound([0, width])
    .paddingInner(0.05)
    .align(0.1)
    .domain(d3.range(datasFinal.length));
​
var z = d3.scaleOrdinal()
    .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]);
​
var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
svg.append("g").selectAll("g")
        .data(d3.stack().keys(d3.range(n))(datasFinal))
  .enter().append("g")
    .style("fill", function(d) { return z(d.key); })    
    .selectAll("rect")
  .data(function(d) { return d; })
    .enter().append("rect")
      .attr("x", function(d, i) { return x(i); })
      .attr("y", function(d) { return y(d[1]); })
      .attr("height", function(d) { return y(d[0]) - y(d[1]); })
      .attr("width", x.bandwidth());
​
  });
</script>
    