minTickSize example for flot
http://stackoverflow.com/questions/12908222/put-only-integers-in-x-and-y-axis-of-bar-and-line-graphs-flot
by ryleyb
HTML
<script src="http://people.iola.dk/olau/flot/jquery.flot.js"></script>
<div id="placeholder" style="width:600px;height:300px;"></div>
JavaScript
var data = [[1, 1], [2, 2], [3, 5]];
$.plot($("#placeholder"), [data], {
xaxis: {
minTickSize: 1
}
});