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d3 and dnorm()
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| <html> | |
| <head> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <!-- <script src="http://www.jstat.org/jstat-1.0.0.min.js"></script> --> | |
| <!-- above source is down, need to build our own jstat (https://github.com/jstat/jstat), meanwhile, use unreliable mirror: --> | |
| <script src="https://raw.githubusercontent.com/jstat/jstat/master/dist/jstat.min.js"></script> | |
| </head> | |
| <body> | |
| <div id="d3"></div> | |
| <script type="text/javascript"> | |
| var w = 800; | |
| var h = 600; | |
| var svg = d3.select("#d3") | |
| .append("svg") | |
| .attr("width", w) | |
| .attr("height", h); | |
| var xscale = d3.scale.linear() | |
| .domain([-3, 3]) | |
| .range([0, w]); | |
| var yscale = d3.scale.linear() | |
| .domain([0, .5]) | |
| .range([h, 0]); | |
| var range = jStat(jStat.seq(-5,5,100)); | |
| var densities = range.normal(0.0,1.0).pdf() | |
| var dataset = [], zerodata = []; | |
| for (var i = 0; i < range[0].length; i++) { | |
| dataset.push([range[0][i], densities[0][i]]); | |
| zerodata.push([0, 0]); | |
| } | |
| var pdfArea = d3.svg.area() | |
| .x(function(d) { return xscale(d[0]) }) | |
| .y1(function(d) { return yscale(d[1]) }) | |
| .y0(h) | |
| .interpolate("basis"); | |
| var pdfLine = d3.svg.line() | |
| .x(function(d) { return xscale(d[0])}) | |
| .y(function(d) { return yscale(d[1])}) | |
| .interpolate("basis"); | |
| // svg.append("line") | |
| // .attr("x1", xscale(d3.min(range))) | |
| // .attr("x2", xscale(d3.max(range))) | |
| // .attr("y1", h).attr("y2", h) | |
| // .attr("stroke-width", 5).attr("stroke", "black"); | |
| svg.append("text") | |
| .attr("dx", 10).attr("dy", 10) | |
| .attr("width", 30).attr("height", 30) | |
| .text("click me consecutively"); | |
| svg.append("path") | |
| .attr("d", pdfArea(zerodata)) | |
| .attr("fill", "green") | |
| .transition().delay(500).duration(1000) | |
| .attr("d", pdfArea(dataset)) | |
| .attr("fill", d3.rgb(255, 124, 138)); | |
| svg.on("click", function() { | |
| newmean = Math.random() * 6 - 3; | |
| newden = range.normal(newmean,1.0).pdf() | |
| var newdata = []; | |
| for (var i = 0; i < range[0].length; i++) { | |
| newdata.push([range[0][i], newden[0][i]]); | |
| } | |
| svg.select("path") | |
| .attr("d", pdfArea(zerodata)) | |
| .attr("fill", "pink") | |
| .transition().delay(500).duration(1000) | |
| .attr("d", pdfArea(newdata)) | |
| .attr("fill", d3.rgb(255, 124, 138)); | |
| }) | |
| svg.append("path") | |
| .attr("d", pdfLine(dataset)) | |
| .attr("stroke", "black") | |
| .attr("stroke-width", 3) | |
| .attr("fill", "none"); | |
| </script> | |
| </body> | |
| </html> |
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