Force Layout & Matrix Market Format

The University of Florida Sparse Matrix Collection provides a vast collection of interesting graphs in Matrix Market format. This example shows how to adapt this format to D3's force layout.

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  margin: 0;
}

.node {
  fill: steelblue;
}

.link {
  stroke: #ccc;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var width = 960,
    height = 500;

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

var force = d3.layout.force()
    .size([width, height]);

d3.text("can_161.mtx", function(error, text) {
  if (error) throw error;

var graph = parseMtx(text);

var link = svg.selectAll(".link")
      .data(graph.links)
    .enter().append("line")
      .attr("class", "link");

var node = svg.selectAll(".node")
      .data(graph.nodes)
    .enter().append("circle")
      .attr("class", "node")
      .attr("r", 4.5)
      .call(force.drag);

force
      .nodes(graph.nodes)
      .links(graph.links)
      .on("tick", tick)
      .start();

node.attr("cx", function(d) { return d.x; })
        .attr("cy", function(d) { return d.y; });
  }
});

function parseMtx(text) {
  var nodes = [];

return {
    nodes: nodes,
    links: links
  };
}

</script>

https://d3js.org/d3.v3.min.js