D3 Examples - K-means clustering of wine data

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<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
​
var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
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var x = d3.scale.linear()
    .range([0, width]);
​
var y = d3.scale.linear()
    .range([height, 0]);
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var color = d3.scale.category20();
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var tooltip = d3.select("body").append("div")
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​
​
d3.csv("clusters.csv", function(error, data) {
  if (error) throw error;
​
  data.forEach(function(d) {
    d.Alcohol = +d.Alcohol;
    d.Malic = +d.Malic;
    d.cluster = d.cluster;
  });
​
​
  x.domain(d3.extent(data, function(d) { return d.Alcohol; })).nice();
  y.domain(d3.extent(data, function(d) { return d.Malic; })).nice();
​
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)
    .append("text")
      .attr("class", "label")
      .attr("x", width)
      .attr("y", -6)
      .style("text-anchor", "end")
      .text("Alcohol");
​
  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("class", "label")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Malic")
​
  svg.selectAll(".dot")
      .data(data)
    .enter().append("circle")
      .attr("class", "dot")
      .attr("r", 5)
      .attr("cx", function(d) { return x(d.Alcohol); })
      .attr("cy", function(d) { return y(d.Malic); })
      .style("fill", function(d) { return color(d.cluster); })
      .on("mouseover", function(d){
             tooltip.transition()
                .duration(200)
                .style("opacity", .9);
             tooltip.html("Cluster: " + d.cluster + "<br/> Alcohol: " + d.Alcohol + "<br/> Malic: " + d.Malic)
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                .style("top", (d3.event.pageY - 20) + "px");
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      .attr("width", 18)
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​
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      .attr("x", width - 24)
      .attr("y", 9)
      .attr("dy", ".35em")
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      .text(function(d) { return d; });
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​
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