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  7    <title>dygraphs JavaScript Visualization Library</title>
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  9      <script type="text/javascript" src="excanvas.js"></script>
 10    <![endif]-->
 11    <script type="text/javascript" src="dygraph-combined.js"></script>
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 27    <a href=""><img style="position: absolute; top: 0; right: 0; border: 0; z-index: 1;" src="" alt="Fork me on GitHub"></a>
 29    <div id="nav">
 30      <h2>Documentation</h2>
 31      <ul>
 32        <li><a href="#demo">Demo</a></li>
 33        <li><a href="#usage">Usage</a></li>
 34        <li><a href="#ie">IE Compatibility</a></li>
 35        <li><a href="#gviz">GViz Data</a></li>
 36        <li><a href="#baseball">Baseball chart</a></li>
 37        <li><a href="#stock">Stock chart</a></li>
 38        <li><a href="#gwt">GWT Compatibility</a></li>
 39        <li><a href="#policy">Data Policy</a></li>
 40        <li><a href="options.html">Options Reference</a></li>
 41        <li><a href="jsdoc/symbols/Dygraph.html">JSDoc Reference</a></li>
 42        <li><a href="data.html">Data Formats</a></li>
 43        <li><a href="annotations.html">Annotations</a></li>
 44      </ul>
 46      <h2>Project</h2>
 47      <ul>
 48        <li><a href="">Blog</a></li>
 49        <li><a href="">Source</a></li>
 50        <li><a href="">Issues</a></li>
 51        <li><a href="">Report Bug</a></li>
 52        <li><a href="changes.html">Contribute a change</a></li>
 53        <li><a href="mailto:dygraphs-users [at]">Contact</a></li>
 54      </ul>
 56      <h2>Demos/Usage</h2>
 57      <ul>
 58        <li><a href="#users">Known Users</a></li>
 59        <hr/>
 60        <li><span style="color: red;">New!</span> <a href="gallery/">(browse gallery)</a></li>
 61        <li><a href="tests/">(browse demos)</a></li>
 62        <li><a href="tests/demo.html">Basic Demo</a></li>
 63        <li><a href="tests/gviz.html">GViz Demo</a></li>
 64        <li><a href="tests/plotter.html">Equation Plotter</a></li>
 65        <li><a href="tests/perf.html">Performance Test</a></li>
 66        <li><a href="tests/annotation.html">Annotations</a></li>
 67        <li><a href="tests/annotation-gviz.html">Annotations (GViz)</a></li>
 68        <li><a href="tests/fillGraph.html">Filled Chart</a></li>
 69        <li><a href="tests/perf.html">Fractions</a></li>
 70        <li><a href="tests/visibility.html">Visibility</a></li>
 71        <li><a href="tests/label-div.html">Labels in a DIV</a></li>
 72        <li><a href="tests/numeric-axis.html">Numeric Axis</a></li>
 73        <li><a href="tests/draw-points.html">Dotted Points</a></li>
 74        <li><a href="tests/native-format.html">Native Format</a></li>
 75        <li><a href="tests/grid_dot.html">Crazy Styles</a></li>
 76        <li><a href="tests/spacing.html">Tick spacing</a></li>
 77        <li><a href="tests/callback.html">Callbacks</a></li>
 78        <li><a href="tests/hourly.html">Hourly/Minutely data</a></li>
 79        <li><a href="tests/isolated-points.html">Isolated Points</a></li>
 80        <li><a href="tests/missing-data.html">Missing Data</a></li>
 81        <li><a href="tests/border.html">Bordered chart</a></li>
 82        <li><a href="tests/custom-bars.html">Custom Bars</a></li>
 83        <li><a href="tests/customLabel.html">Custom Label Styles</a></li>
 84        <li><a href="tests/dygraph.html">Minimal Example</a></li>
 85        <li><a href="tests/negative.html">Negative Numbers</a></li>
 86        <li><a href="tests/highlighted-region.html">Custom Underlay / background</a></li>
 87        <li><a href="tests/zoom.html">Tests for zoom operations</a></li>
 88        <li><a href="tests/logscale.html">Log scale tests</a></li>
 89      </ul>
 90    </div>
 92    <div id="content">
 93      <h1>dygraphs JavaScript Visualization Library</h1>
 95      <p><a href=""></a></p>
 96      <p>See <a href="">blog</a>, <a href="">mailing list</a>, <a href="">downloads</a>, <a href="tests/">demos</a> and <a href="">open issues</a></p>
 98      <p>dygraphs is an open source JavaScript library that produces produces interactive, zoomable charts of time series. It is designed to display dense data sets and enable users to explore and interpret them.</p>
100      <h3 id="demo">A demo is worth a thousand words:</h3>
102      <p style="font-size:0.8em">(Mouse over to highlight individual values. Click and drag to zoom. Double-click to zoom back out. Change the number and hit enter to adjust the averaging period.)</p>
104      <div id="demodiv" style="width:800px; height:320px;"></div>
105      <script type="text/javascript">
106        g = new Dygraph(
107          document.getElementById("demodiv"),
108          "ny-vs-sf.txt",
109          {
110            rollPeriod: 14,
111            showRoller: true,
112            customBars: true,
113            title: 'Daily Temperatures in New York vs. San Francisco',
114            ylabel: 'Temperature (F)',
115            legend: 'always',
116            labelsDivStyles: { 'textAlign': 'right' }
117          }
118        );
119      </script>
121      <h4>Some things to notice:</h4>
122      <ul>
123        <li>There's less seasonal temperature variation in SF than in NY.</li>
124        <li>The difference is about 15&deg; F for SF vs. 50&deg; F for NY.</li>
125        <li>The daily data (set rolling period to 1) is quite noisy and hides this conclusion.</li>
126        <li>Using a 14-day moving average makes it clearer. A 100-day rolling period averages out nearly all the specifics from the data.</li>
127        <li>There's a gap in the data for SF, when the weather station was down (zoom into October 2007 to see it).</li>
128        <li>The bands around each point indicate average highs and lows.</li>
129        <li>There is a <em>lot</em> of data in this chart: low, average and high for each city on each day of a three year period &asymp; 6000 data points in all.</li>
130      </ul>
132      <p>dygraphs allows the user to explore the data and discover these facts.</p>
134      <p>For more demos, browse the dygraph <a href="tests/">tests</a>
135      directory. To see other people who are using dygraphs, check out the <a
136      href="#users">known users</a>.</p>
138      <h3>Features</h3>
139      <p>Some of the features of dygraphs:</p>
140      <ul>
141        <li>Plots time series without using an external server or Flash</li>
142        <li>Works in Internet Explorer (using excanvas)</li>
143        <li>Lightweight (69kb) and responsive</li>
144        <li>Displays values on mouseover, making interaction easily discoverable</li>
145        <li>Supports error bands around data series</li>
146        <li>Interactive zoom</li>
147        <li>Displays Annotations on the chart</li>
148        <li>Adjustable averaging period</li>
149        <li>Can intelligently chart fractions</li>
150        <li>Customizable click-through actions</li>
151        <li>Compatible with the Google Visualization API</li>
152        <li>Intelligent defaults make it easy to use</li>
153      </ul>
155      <h2 id="usage">Usage</h2>
157      <p>To use dygraphs, include the <code><a href="">dygraph-combined.js</a></code> JavaScript file and instantiate a <code>Dygraph</code> object.</p>
159      <p>Here's a basic example to get things started:</p>
161      <div class="example" style="clear:both;">
162        <div class="codeblock" style="float:left;width:400px;">
163          <h3 style="text-align:center">HTML</h3>
164          <code>
165  <pre>
168&lt;script type=&quot;text/javascript&quot;
169  src=&quot;dygraph-combined.js&quot;&gt;&lt;/script&gt;
172&lt;div id=&quot;graphdiv&quot;&gt;&lt;/div&gt;
173&lt;script type=&quot;text/javascript&quot;&gt;
174  g = new Dygraph(
176    // containing div
177    document.getElementById(&quot;graphdiv&quot;),
179    // CSV or path to a CSV file.
180    &quot;Date,Temperature\n&quot; +
181    &quot;2008-05-07,75\n&quot; +
182    &quot;2008-05-08,70\n&quot; +
183    &quot;2008-05-09,80\n&quot;
185  );
190          </code>
191        </div>
192        <div class="codeoutput" style="float:left;">
193          <h3 style="text-align:center">OUTPUT</h3>
194          <div id="graphdiv"></div>
195          <script type="text/javascript">
196            g = new Dygraph(
198              // containing div
199              document.getElementById("graphdiv"),
201              // CSV or path to a CSV file.
202              "Date,Temperature\n" +
203              "2008-05-07,75\n" +
204              "2008-05-08,70\n" +
205              "2008-05-09,80\n"
206            );
207          </script>
208        </div>
209      </div>
211      <p style="clear:both">In order to keep this example self-contained, the second parameter is raw CSV data. The dygraphs library parses this data (including column headers), resizes its container to a reasonable default, calculates appropriate axis ranges and tick marks and draws the graph.</p>
213      <p>In most applications, it makes more sense to include a CSV file instead. If the second parameter to the constructor doesn't contain a newline, it will be interpreted as the path to a CSV file. The Dygraph will perform an XMLHttpRequest to retrieve this file and display the data when it becomes available. Make sure your CSV file is readable and serving from a place that understands XMLHttpRequest's! In particular, you cannot specify a CSV file using <code>"file:///"</code>. Here's an example: (data from <a href=";monthend=12&amp;yearend=2007&amp;req_city=NA&amp;req_state=NA&amp;req_statename=NA">Weather Underground</a>)</p>
215      <div class="example" style="clear:both;">
216        <div class="codeblock" style="float:left;width:400px;">
217          <h3 style="text-align:center">HTML</h3>
218          <code>
222&lt;script type=&quot;text/javascript&quot;
223  src=&quot;dygraph-combined.js&quot;&gt;&lt;/script&gt;
226&lt;div id=&quot;graphdiv2&quot;
227  style=&quot;width:500px; height:300px;&quot;&gt;&lt;/div&gt;
228&lt;script type=&quot;text/javascript&quot;&gt;
229  g2 = new Dygraph(
230    document.getElementById(&quot;graphdiv2&quot;),
231    &quot;temperatures.csv&quot;, // path to CSV file
232    {}          // options
233  );
238          </code>
239        </div>
240        <div class="codeoutput" style="float:left;">
241          <h3 style="text-align:center">OUTPUT</h3>
242          <div id="graphdiv2" style="width:500px; height:300px;"></div>
243          <script type="text/javascript">
244            g2 = new Dygraph(
245              document.getElementById("graphdiv2"),
246              "temperatures.csv",
247              {}
248            );
249          </script>
250        </div>
251      </div>
253      <p style="clear:both;">The file used is <code><a href="temperatures.csv">temperatures.csv</a></code>.</p>
255      <p>There are a few things to note here:</p>
257      <ul>
258        <li>The Dygraph sent off an XHR to get the temperatures.csv file.</li>
259        <li>The labels were taken from the first line of <code>temperatures.csv</code>, which is <code>Date,High,Low</code>.</li>
260        <li>The Dygraph automatically chose two different, easily-distinguishable colors for the two data series.</li>
261        <li>The labels on the x-axis have switched from days to months. If you zoom in, they'll switch to weeks and then days.</li>
262        <li>Some heuristics are used to determine a good vertical range for the data. The idea is to make all the data visible and have human-friendly values on the axis (i.e. 200 instead of 193.4). Generally this works well.</li>
263        <li>The data is very spiky. A moving average would be easier to interpret.</li>
264      </ul>
266      <p>This problem can be fixed by specifying the appropriate options in the "additional options" parameter to the Dygraph constructor. To set the number of days for a moving average, use the <code>rollPeriod</code> option. Here's how it's done:</p>
268      <div class="example" style="clear:both;">
269        <div class="codeblock" style="float:left;width:400px;">
270          <h3 style="text-align:center">HTML</h3>
271          <code>
275&lt;script type=&quot;text/javascript&quot;
276  src=&quot;dygraph-combined.js&quot;&gt;&lt;/script&gt;
279&lt;div id=&quot;graphdiv3&quot;
280  style=&quot;width:500px; height:300px;&quot;&gt;&lt;/div&gt;
281&lt;script type=&quot;text/javascript&quot;&gt;
282  g3 = new Dygraph(
283    document.getElementById(&quot;graphdiv3&quot;),
284    &quot;temperatures.csv&quot;,
285    {
286      rollPeriod: 7,
287      showRoller: true
288    }
289  );
294          </code>
295        </div>
296        <div class="codeoutput" style="float:left;">
297          <h3 style="text-align:center">OUTPUT</h3>
298          <div id="graphdiv3" style="width:500px; height:300px;"></div>
299          <script type="text/javascript">
300            g3 = new Dygraph(
301              document.getElementById("graphdiv3"),
302              "temperatures.csv",
303              {
304                rollPeriod: 7,
305                showRoller: true
306              }
307            );
308          </script>
309        </div>
310      </div>
312      <p style="clear:both;">A rolling average can be set using the text box in the lower left-hand corner of the graph (the showRoller attribute is what makes this appear). Also note that we've explicitly set the size of the chart div.</p>
314      <h2>Error Bars</h2>
316      <p>Another significant feature of the dygraphs library is the ability to display error bars around data series. One standard deviation must be specified for each data point. A <em>&plusmn;n</em> sigma band will be drawn around the data series at that point. If a moving average is being displayed, dygraphs will compute the standard deviation of the average at each point. I.E. <em>&sigma; = sqrt( (&sigma;<sub>1<sup>2</sup></sub> + &sigma;<sub>2<sup>2</sup></sub> + ... + &sigma;<sub>n<sup>2</sup></sub>) / n )</em></p>
318      <p>Here's a demonstration. There are two data series. One is <code>N(100,10)</code> with a standard deviation of 10 specified at each point. The other is <code>N(80,20)</code> with a standard deviation of 20 specified at each point. The CSV file was generated using Octave and can be viewed at <a href="twonormals.csv">twonormals.csv</a>.</p>
320      <div class="example" style="clear:both;">
321        <div class="codeblock" style="float:left;width:400px;">
322          <h3 style="text-align:center">HTML</h3>
323          <code>
327&lt;script type=&quot;text/javascript&quot;
328  src=&quot;combined.js&quot;&gt;&lt;/script&gt;
331&lt;div id=&quot;graphdiv4&quot;
332  style=&quot;width:480px; height:320px;&quot;&gt;&lt;/div&gt;
333&lt;script type=&quot;text/javascript&quot;&gt;
334  g4 = new Dygraph(
335    document.getElementById(&quot;graphdiv4&quot;),
336    &quot;twonormals.csv&quot;,
337    {
338      rollPeriod: 7,
339      showRoller: true,
340      errorBars: true,
341      valueRange: [50,125]
342    }
343  );
348          </code>
349        </div>
350        <div class="codeoutput" style="float:left;">
351          <h3 style="text-align:center">OUTPUT</h3>
352          <div id="graphdiv4" style="width:480px; height:320px;"></div>
353          <script type="text/javascript">
354            g4 = new Dygraph(
355              document.getElementById("graphdiv4"),
356              "twonormals.csv",
357              {
358                rollPeriod: 7,
359                showRoller: true,
360                errorBars: true,
361                valueRange: [50,125]
362              }
363            );
364          </script>
365        </div>
366      </div>
368      <p style="clear:both;">Things to note here:</p>
370      <ul>
371        <li>The <strong>errorBars</strong> option affects both the interpretation of the CSV file and the display of the graph. When <strong>errorBars</strong> is set to true, each line is interpreted as <em>YYYYMMDD</em>, <em>A</em>, <em>sigma_A</em>, <em>B</em>, <em>sigma_B</em>, &hellip;</li>
372        <li>The first line of the CSV file doesn't mention the error columns. In this case, it's just "Date,Series1,Series2".</li>
373        <li>The averaging visibly affects the error bars. This is most clear if you crank up the rolling period to something like 100 days. For the earliest dates, there won't be 100 data points to average so the signal will be noisier. The error bars get smaller like sqrt(N) going forward in time until there's a full 100 points to average.</li>
374        <li>The error bars are partially transparent. This can be seen when they overlap one another.</li>
375      </ul>
377      <h2 id="ie">Internet Explorer Compatibility</h2>
379      <p>The dygraphs library relies heavily on the HTML5 <code>&lt;canvas&gt;</code> tag, which Microsoft Internet Explorer did not traditionally support. To use Microsoft's native canvas implementation in IE9, you need to set an HTML5 doctype on your page:</p>
382&lt;!DOCTYPE html&gt;
385      <p>When IE9 is in HTML5 mode, dygraphs works just like in other modern browsers.</p>
387      <p>If you want to support previous versions of Internet Explorer (IE6&ndash;IE8), you'll need to include the <a href="">excanvas</a> library, which emulates the <code>&lt;canvas&gt;</code> tag using VML. You can add excanvas by including the following snippet:</p>
390&lt;!DOCTYPE html&gt; 
392  &lt;head&gt;
393    &lt;meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7; IE=EmulateIE9"&gt; 
394    &lt;!--[if IE]&gt;&lt;script src="path/to/excanvas.js"&gt;&lt;/script&gt;&lt;![endif]--&gt;
395  &lt;/head&gt;
398<p>(This is surprisingly tricky because the HTML5 doctype breaks excanvas in IE8. See <a href="">this discussion</a> for details. Note that the &lt;meta http-equiv&hellip;&gt; line must appear <i>first</i> in the &lt;head&gt; section for this to work properly.)</p>
400    <p>While VML emulation sounds like it would be slow, it works well in practice for most charts.</p>
402    <p>One common gotcha to look out for: make sure you don't have any trailing commas in parameter lists, e.g.</p>
405new Dygraph(el, data, {
406  showRoller: true,  // note trailing comma
409    <p>Most browsers will ignore the trailing comma, but it will break under IE.</p>
411    <p>You may also need to delay instantiating any dygraphs until after the DOM
412    content is ready, as there have been some <a
413      href="">reports</a>
414    that excanvas won't work until this happens. If you're using jQuery, this
415    means drawing your charts inside of a <code>$(function() { ... })</code>
416    block.</p>
418    <h2 id="gviz">GViz Data</h2>
420    <p>The <a
421      href="">Google
422      Visualization API</a> provides a standard interface for describing data.
423    Once you've specified your data using this API, you can plug in any
424    GViz-compatible visualization. dygraphs is such a visualization. In
425    particular, it can be used as a drop-in replacement for the
426    AnnotatedTimeline visualization used on Google Finance and other sites. To
427    see how this works, check out the <a href="tests/annotation-gviz.html">gviz
428      annotation demo.</a></p>
430    <p>For a simple demonstration of how to use dygraphs a GViz visualization, see <a href=""></a>. dygraphs can also be used as a GViz gadget. This allows it to be embedded inside of a Google Spreadsheet. For a demonstration of this, see <a   href=";hl=en">this spreadsheet</a>. The URL for the gadget is <code><a href=""></a></code>.</p>
432    <p>Here's an example of a published gviz gadget using dygraphs:</p>
434    <script src=""></script>
436    <h2 id="baseball">Charting Fractions</h2>
438    <p>Situations often arise where you want to plot fractions, e.g. the fraction of respondents in a poll who said they'd vote for candidate X or the number of hits divided by at bats (baseball's batting average). Fractions require special treatment for two main reasons:</p>
440    <ul>
441      <li>The average of <code>a1/b1</code> and <code>a2/b2</code> is <code>(a1+a2)/(b1+b2)</code>, not <code>(a1/b1 + a2/b2)/2</code>.</li>
442      <li>The normal approximation is not always applicable and more sophisticated confidence intervals (e.g. the <a href="">Wilson confidence interval</a>) must be employed to avoid ratios that exceed 100% or go below 0%.</li>
443    </ul>
445    <p>Fortunately, dygraphs handles both of these for you! Here's a chart and the command that generated it:</p>
447    <div style="width:750px; text-align:center; font-weight: bold; font-size: 125%;">Batting Average for Ichiro Suzuki vs. Mariners (2004)</div>
448    <div id="baseballdiv" style="width:750px; height:300px;"></div>
449    <script type="text/javascript">
450      new Dygraph(
451        document.getElementById("baseballdiv"),
452        "suzuki-mariners.txt",
453        {
454          fractions: true,
455          errorBars: true,
456          showRoller: true,
457          rollPeriod: 15
458        }
459      );
460    </script>
462    <p>Command:</p>
464  new Dygraph(
465    document.getElementById(&quot;baseballdiv&quot;),
466    &quot;suzuki-mariners.txt&quot;,
467    {
468      fractions: true,
469      errorBars: true,
470      showRoller: true,
471      rollPeriod: 15
472    }
473  );
476    <p>The <code>fractions</code> option indicates that the values in each column should be parsed as fractions (e.g. "1/2" instead of "0.5"). The <code>errorBars</code> option indicates that we'd like to see a confidence interval around each data point. By default, when <code>fractions</code> is set, you get a Wilson confidence interval. If you look carefully at the chart, you can see that the error bars are asymmetric.</p>
478    <p>A couple things to notice about this chart:</p>
480    <ul>
481      <li>The error bars for Ichiro's batting average are larger than for the Mariners', since he has far fewer at bats than his team.</li>
482      <li>dygraphs makes it easy to see "batting average over the last 30 games". This is ordinarily quite difficult to compute. It makes it clear where the "hot" and "cold" part of Suzuki's season were.</li>
483      <li>If you set the averaging period to something large, like 200, you'll see the team's and player's batting average through that game. The final number is the overall batting average for the season.</li>
484      <li>Where the error bars do not overlap, we can say with 95% confidence that the series differ. There is a better than 95% chance that Ichiro was a better hitter than his team as a whole in 2004, the year he won the batting title.</li>
485    </ul>
487    <h2 id="stock">One last demo</h2>
489    <p>This chart shows monthly closes of the Dow Jones Industrial Average, both in nominal and real (i.e. adjusted for inflation) dollars. The shaded areas show its monthly high and low. CPI values with a base from 1982-84 are used to adjust for inflation.</p>
491    <div id="dow_chart" style="width:750px; height:350px;"></div>
492    <p><b>Display: </b>
493    <input type=checkbox id=0 onClick="stockchange(this)" checked>
494    <label for="0"> Nominal</label>
495    <input type=checkbox id=1 onClick="stockchange(this)" checked>
496    <label for="1"> Real</label>
497    <input type=checkbox id=ann onClick="annotationschange(this)" checked>
498    <label for="ann"> Annotations</label>
499    </p>
501    <script type="text/javascript">
502      var stock_annotations = [
503        {
504          series: "Real",
505          x: "1929-08-15",
506          shortText: "A",
507          text: "1929 Stock Market Peak"
508        },
509        {
510          series: "Nominal",
511          x: "1987-08-15",
512          shortText: "B",
513          text: "1987 Crash"
514        },
515        {
516          series: "Nominal",
517          x: "1999-12-15",
518          shortText: "C",
519          text: "1999 (.com) Peak"
520        },
521        {
522          series: "Nominal",
523          x: "2007-10-15",
524          shortText: "D",
525          text: "All-Time Market Peak"
526        }
527      ];
529    // From
530      stockchart = new Dygraph(
531        document.getElementById('dow_chart'),
532        "dow.txt",
533        {
534          showRoller: true,
535          customBars: true,
536          labelsKMB: true,
537          drawCallback: function(g, is_initial) {
538            if (!is_initial) return;
539            g.setAnnotations( stock_annotations );
540          }
541        }
542      );
544      function stockchange(el) {
545        stockchart.setVisibility(, el.checked);
546      }
548      function annotationschange(el) {
549        if (el.checked) {
550          stockchart.setAnnotations(stock_annotations);
551        } else {
552          stockchart.setAnnotations([]);
553        }
554      }
555    </script>
558Here is a script to regenerate the Dow Jones plot:
560# Get unadjusted DJIA data in a nice format:
561curl -O
562sed '1,17d' eq_d_mi_3.csv | cut -d, -f1,6 | perl -pe 's/(\d{4}-\d\d)-\d\d/$1/g' | perl -pe 's/, */\t/' | grep -v 'na' | perl -ne 'chomp; ($m,$v) = split/\t/; $close{$m} = $v; if ($low{$m} == 0 || $v < $low{$m}) { $low{$m}=$v } if ($v > $high{$m}) { $high{$m} = $v } END { for $x(sort keys %close) { print "$x\t$low{$x}\t$close{$x}\t$high{$x}\n" } } ' > monthly-djia.tsv
564# Fetch and format the CPI data:
565curl '' > cpi-u.txt
566sed '1,/Series Id,Year,/d' cpi-u.txt | sed '/^$/,$d' | cut -d, -f2,3,4 | perl -ne 'print if /,M(0[0-9]|1[012]),/' | perl -pe 's/(\d{4}),M(\d{2}),/$1-$2\t/g' > cpi-u.tsv
568# Merge:
569join -t'     ' cpi-u.tsv monthly-djia.tsv > annotated-djia.tsv
570perl -ne 'BEGIN{print "Month,Nominal,Real\n"} chomp; ($m,$cpi,$low,$close,$high) = split /\t/; $cpi /= 100.0; print "$m-15,$low;$close;$high,",($low/$cpi),";",($close/$cpi),";",($high/$cpi),"\n"' annotated-djia.tsv > dow.txt
574    <h2 id="options">Other Options</h2>
576    <p>In addition to the options mentioned above (<code>showRoller</code>, <code>rollPeriod</code>, <code>errorBars</code>, <code>valueRange</code>), there are <i>many</i> others.</p>
578    <p>For a full list, see the <a href="options.html">Dygraphs Options Reference</a> page.</p>
580    <h2>Common Gotchas</h2>
582    <p>Here are a few problems that I've frequently run into while using the dygraphs library.</p>
584    <ul>
585      <li>If your chart doesn't display, be sure to check your browser's JavaScript error console. dygraphs makes every attempt to log errors and warnings, and these can often guide you in the right direction.</li>
586      <li>Make sure your CSV files are readable! If your graph isn't showing up, the XMLHttpRequest for the CSV file may be failing. You can determine whether this is the case using tools like <a href="">Firebug</a>.</li>
587      <li>Make sure your CSV files are in the correct format. They must be of the form <code>YYYYMMDD, series1, series2, </code>&hellip; . And if you set the <code>errorBars</code> property, make sure you alternate data series and standard deviations.</li>
588      <li>dygraphs are not happy when placed inside a <code>&lt;center&gt;</code> tag. This applies to the CSS <code>text-align</code> property as well. If you want to center a Dygraph, put it inside a table with <code>align = center</code> set.</li>
589      <li>Don't set the <code>dateWindow</code> property to a date. It expects milliseconds since epoch, which can be obtained from a JavaScript Date object's valueOf method.</li>
590      <li>Make sure you don't have any trailing commas in your call to the Dygraph constructor or in the options parameter. Firefox, Chrome and Safari ignore these but they can cause a graph to not display in Internet Explorer.</li>
591    </ul>
593    <h2 id="gwt">GWT Compatibility</h2>
594    <p>There is currently no GWT wrapper around Dygraphs, however there is a class that can be used to easily load Dygraphs into the browser.  To use it, include the generated dygraph-gwt.jar file in your classpath and add the following line to your GWT module:</p>
597&lt;inherits name=&quot;org.danvk.dygraphs&quot;/&gt;    
600    <p>Call org.danvk.Dygraphs.install() when your application starts to install the JavaScript code into the browser.  You can use <a href="">JSNI</a> to call Dygraphs from your GWT code, as in the example below.  The example uses the <a href="">Visualization API for GWT</a> and the <a href="#gviz">Dygraphs GViz API.</a></p>
603public static native JavaScriptObject drawDygraph(
604    Element element, DataTable dataTable, double minY, double maxY) /*-{
605  var chart = new $wnd.Dygraph.GVizChart(element);
606  chart.draw(dataTable,
607    {
608      valueRange: [minY, maxY]
609    });
610  return chart;
614    <a name="users" />
615    <h2>Known Users</h2>
616    <p>Since its public release in late 2009, dygraphs has found many users
617    across the web. This is a small collection of the uses that we know about.
618    If you're using dygraphs, please send <a
619    href="">Dan</a> a link and he'll add it to this
620    list.</p>
622    <p>dygraphs was originally developed at Google and has found wide use on
623    internal dashboards and servers there. There are also a few uses of
624    dygraphs on public Google products:</p>
626    <ul class='padded-list'>
627    <li><a href="">Google Correlate</a><br/>
628    <span class="desc">Uses dygraphs for time series visualization. Mostly a standard configuration, with just a few tweaks to match Google style.</span></li>
630    <li><a href="">Google Correlate - Search by Drawing</a><br/>
631    <span class="desc">This is a highly customized configuration which lets the user draw a time series. Based on <a href="tests/drawing.html">this demo</a>.</span></li>
633    <li><a href="">Google Latitude History Dashboard</a><br/>
634    <span class="desc">Uses mouse interaction callbacks to synchronize time series points with markers on a Google Map.</span></li>
635    </ul>
637    <p>dygraphs has also found use in other organizations:</p>
639    <ul class='padded-list'>
640  <li><a
641    href="!3!0!ACE.B_x!ACE.B_y!ACE.B_z!">Integrated
642    Space Weather Analysis System</a> (NASA)<br/>
643  <span class="desc">&ldquo;We use [dygraphs] in the Integrated Space Weather
644    Analysis System available from the Space Weather Laboratory at NASA Goddard
645    Space Flight Center. It works quite well for time series data from various
646    missions and simulations that we store.&rdquo;</span></li>
649  <li><a href="">Eutelsat</a><br/>
650  <span class="desc">&ldquo;Eutelsat uses dygraphs for charting spacecraft
651    telemetry for a fleet of 25 geostationary satellites. The spacecraft
652    engineers are very happy with it.  All satellite combined are producing
653    about 200 millions unique data points per day so we really appreciate the
654    excellent performance of dygraphs.&rdquo;</span></li>
656  <li><a href="">10gen MongoDB
657    Monitoring Service</a><br/>
658  <span class="desc">A free monitoring service for MongoDB from 10gen (the
659    creators of MongoDB). Used by thousands of servers and users. Makes use of
660    <a href="tests/synchronize.html">synchronized charts</a> to display many
661    quantities simultaneously.</span></li>
663  <li><a href="">Duck Duck Go Traffic Dashboard</a><br/>
664  <span class="desc">DDG uses dygraphs to display a public chart of their daily traffic. They use annotations and the moving average features.</span></li>
666    <li><a href="">Wikimedia Foundation - Moodbar data dashboard</a><br/>
667    <span class="desc">dygraphs is used internally at Wikimedia as a handy solution to monitor the
668    results of a bunch of small experiments.</span></li>
670  <li><a href="">quadrant-framework</a> (MySQL Load Testing Framework)<br/>
671  <span class="desc">A user friendly framework for creating and visualizing
672    MySQL database load test jobs. For more information on its use of dygraphs,
673    see <a href="">this post</a>.</span></li>
675  <li><a href="">Spinwave Systems</a> (Home energy monitoring)<br/>
676  <span class="desc">dygraphs is used to chart energy usage over time.</span></li>
679    <li><a href="">Jwebchart</a><br/>
680    <span class="desc">
681    jWebChart is a stand-alone and Thredds' embedded plotting system for
682    netCDF files. NetCDF is a common standard for the storage and
683    distribution of scientific data.
684    </span></li>
686    <li><a href="">n-gramas - Explore las tendencias en los artĂ­culos periodĂ­sticos de Colombia.</a><br/>
689    <span class="desc">(English: "Explore trends in newspaper articles of
690    Colombia"). dygraphs is used for displaying the results of this n-grams
691    viewer.  Uses an extension for exporting the plots as PNG images
692    (<a href="">[1]</a>, <a href="">[2]</a>).
693    </span></li>
695    <li><a href="">NOAA Great Lakes Water Level Dashboard</a><br/>
696    <span class="desc">The Great Lakes Water Level dashboard was designed to help users view, understand, and compare Great Lakes surface water elevation data and forecasts from a variety of different sources, and across a variety of time scales ranging from monthly average values, to annual and multi-decadal values. First developed in Adobe Flash, a HTML 5 compatible version has been in the works and a functional draft is available here.</span></li>
698    </ul>
700    <p>Are you using dygraphs? Please let <a href="">Dan</a> know and he'll add your link here!</p>
703    <h2 id="policy">Data Policy</h2>
704    <p>dygraphs is purely client-side JavaScript. It does not send your data to any servers &ndash; the data is processed entirely in the client's browser.</p>
706    <p style="font-size:0.8em">Created May 9, 2008 by <a>Dan Vanderkam</a></p>
707  </div>