var usv = d3.dsvFormat("_");
    var headers = [];

    // this is the parse
    
    var output = usv.parse(">NODE_length_135_cov_6.362500")
    console.log(output)
    
		var a = 0;
    var t = 0;
    var g = 0;
		var c = 0;
    
    d3.request("test.fasta")
  		.mimeType("text/plain")
 			.response(function(xhr) { return usv.parse(xhr.responseText) }) 
    // function that access information from a URL
  		.get(function(data) {
      	//console.log("data: ", data)
      	data.forEach(function (d){
          if (d.node == ">NODE"){
            headers.push({name: d.id, size: +d.size, seq: "", gc: 0})
          }
          else{
            headers[headers.length-1].seq += d.node; 
            // give me te object in the last of thea array
          }
          
        })
    
        headers.foreach(function(d){
          d.gc = ((d.seq.match(/G/g)|| []).length + (d.seq))/ d.seq.length
        })
        
        //console.log ("headers: ", headers);
      
      
var formatCount = d3.format(",.0f");

var svg = d3.select("svg"),
    margin = {top: 10, right: 30, bottom: 30, left: 30},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");   
  });

var data = [[5,3], [10,17], [15,4], [2,8]];
   
    var margin = {top: 20, right: 15, bottom: 60, left: 60}
      , width = 960 - margin.left - margin.right
      , height = 500 - margin.top - margin.bottom;
    
    var x = d3.scaleLinear()
              .domain([0, d3.max(data, function(d) { return d[0]; })])
              .range([ 0, width ]);
    
    var y = d3.scaleLinear()
    	      .domain([0, d3.max(data, function(d) { return d[1]; })])
    	      .range([ height, 0 ]);
 
    var chart = d3.select('body')
	.append('svg:svg')
	.attr('width', width + margin.right + margin.left)
	.attr('height', height + margin.top + margin.bottom)
	.attr('class', 'chart')

    var main = chart.append('g')
	.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')')
	.attr('width', width)
	.attr('height', height)
	.attr('class', 'main')   
        
    // draw the x axis
    var xAxis = d3.axisBottom()
	.scale(x);

    main.append('g')
	.attr('transform', 'translate(0,' + height + ')')
	.attr('class', 'main axis date')
	.call(xAxis);

    // draw the y axis
    var yAxis = d3.axisLeft()
	.scale(y);

    main.append('g')
	.attr('transform', 'translate(0,0)')
	.attr('class', 'main axis date')
	.call(yAxis);

    var g = main.append("svg:g"); 
    
    g.selectAll("scatter-dots")
      .data(data)
      .enter().append("svg:circle")
          .attr("cx", function (d,i) { return x(d[0]); } )
          .attr("cy", function (d) { return y(d[1]); } )
          .attr("r", 8);