$(document).ready( function(){
var margin = {top: 40, right: 40, bottom: 40, left: 40},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var currencyFormat = function(d) { return "$" + d.toFixed(2); };
var x = d3.scale.ordinal()
.rangeRoundBands([0, width], 0.7);
var y = d3.scale.linear()
.range([height, 0]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.orient("left")
.tickFormat(currencyFormat);
var tip = d3.tip()
.attr('class', 'd3-tip')
.offset([-10, 0])
.html(function(d) {
return "<strong style='font-family:Roboto; font-size:12px; color: #181F27;'>$" + (d.expense).toFixed(2) + "</strong>";
})
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 + ")");