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    <p>The x function usually scales from your data domain to the range needed which is often the width of your chart. This is how you'll find things in many examples.</p> <p>Usually to create axes, you pass to d3.svg.axis() your x function. However, the main job of the x function is often to create, in my case, the bars of a bar chart.</p> <p>My own x function that I'm using in this bar chart:</p> <pre><code>var x = d3.scale.linear() .domain([0, data.length]) .rangeRound([0, width]); </code></pre> <p>Here's one from <a href="http://bl.ocks.org/mbostock/7441121" rel="nofollow">MBostock</a>:</p> <pre><code>var x = d3.scale.ordinal() .rangeRoundBands([0, width], .1); </code></pre> <p>And another with a <a href="http://jsfiddle.net/robdodson/KWRxW/" rel="nofollow">JSFiddle</a>:</p> <pre><code>var x = d3.time.scale() .domain([new Date(data[0].date), d3.time.day.offset(new Date(data[data.length - 1].date), 1)]) .rangeRound([0, width - margin.left - margin.right]); </code></pre> <p>Using the power and simplicity of d3 scales, I was able to solve this problem by converting from array indices to dates with a separate x function, xAsTime, like so:</p> <pre><code>var xAsTime = d3.time.scale() .domain([this.start * 1000, this.end * 1000]) .range([0, width]) var xAxis = d3.svg.axis() .scale(xAsTime) .tickSize(-height) .tickPadding(3); </code></pre> <p>As per my question, the only change was to switch the domain and ranges. While I unsure of the details, it seems like the domain of the scale is what is displayed as ticks.</p>
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