Path transition

Trying to understand path interpolation. Example here followed: /mbostock/1642989

Transition in my example above is jumpy rather than smooth like in above link.

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>basic line example</title>
<script src="https://d3js.org/d3.v3.min.js"></script>

<style>

path {
 stroke:red;
 stroke-width:2;
 fill:none;
 }

</style>
</head>
<body>
<script type="text/javascript">

var margin = {top: 20, right: 20, bottom: 20, left: 40},
    width = 1400 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

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("defs")
    .append("clipPath")
    .attr("id","clip")
    .append("rect")
    .attr("width",width)
    .attr("height",height);

var dataset = [];
    for (var i = 0; i < 55; i++) {
        var newNumber = Math.random();
        dataset.push(newNumber);
        
}

var xScale = d3.scale.linear().domain([0,54]).range([0,width]);
var yScale = d3.scale.linear().domain([0,1]).range([height,0]);

var line = d3.svg.line()
    .interpolate("basis")
    .x(function(d,i) { return xScale(i); })
    .y(function(d) { return yScale(d); });

var path =  svg.append("g")
.attr("clip-path","url(#clip)")
.append("svg:path")
 .attr("transform","translate(" + xScale(0) + ")")
        .attr("d", line(dataset));

function animate() {
  svg.selectAll("path")
  .attr("transform","translate(" + xScale(1) + ")")
  .attr("d",line(dataset))
  .transition()
  .ease("linear")
  .duration(3000)
  .attr("transform","translate(" + xScale(0) + ")");
  };
        
        
    
    
 setInterval(function() {
 dataset.push(Math.random());
 animate();
dataset.shift();}, 1500)
    
    
</script>

</body>
</html>

Modified http://d3js.org/d3.v3.min.js to a secure url

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