tests/independent-series.html

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   4     <title>Independent Series</title>
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  31     <h3>Independent Series</h3>
  32     <p>By using the connectSeparated attribute, it's possible to display a chart of several time series with completely independent x-values.</p>
  33
  34     <p>The trick is to specify values for the series at the union of the x-values of all series. For one series' x values, specify <code>null</code> for each of the other series.</p>
  35
  36     <div id="graph" style="float: right; margin-right: 50px; width: 400px; height: 300px;"></div>
  37     <p>For example, say you had two series:</p>
  38     <table><tr>
  39     <td valign=top>
  40     <table>
  41       <table class=thinborder>
  42         <tr><th>x</th><th>A</th></tr>
  43         <tr><td>2</td><td>2</td></tr>
  44         <tr><td>4</td><td>6</td></tr>
  45         <tr><td>6</td><td>4</td></tr>
  46       </table>
  47     </td>
  48     <td valign=top style="padding-left:25px;">
  49       <table class=thinborder>
  50         <tr><th>x</th><th>B</th></tr>
  51         <tr><td>1</td><td>3</td></tr>
  52         <tr><td>3</td><td>7</td></tr>
  53         <tr><td>5</td><td>5</td></tr>
  54       </table>
  55     </td>
  56     </tr></table>
  57
  58     <p>Then you would specify the following CSV or native data:</p>
  59     <table><tr>
  60     <td valign=top>
  61     (CSV)
  62     <pre>X,A,B
  63 1,,3
  64 2,2,
  65 3,,7
  66 4,6,
  67 5,,5
  68 6,4,</pre>
  69     </td>
  70     <td valign=top style="padding-left: 25px;">
  71     (native)
  72     <pre>[
  73 [1, null, 3],
  74 [2, 2, null],
  75 [3, null, 7],
  76 [4, 6, null],
  77 [5, null, 5],
  78 [6, 4, null] ]</pre>
  79     </td>
  80     </tr></table>
  81
  82     <script type="text/javascript">
  83     new Dygraph(
  84       document.getElementById("graph"),
  85       [
  86         [1, null, 3],
  87         [2, 2, null],
  88         [3, null, 7],
  89         [4, 5, null],
  90         [5, null, 5],
  91         [6, 3, null]
  92       ],
  93       {
  94         labels: ["x", "A", "B" ],
  95         connectSeparatedPoints: true,
  96         drawPoints: true
  97       }
  98     );
  99     </script>
 100
 101     <h3>Encoding a gap</h3>
 102     <p>There's one extra wrinkle. What if one of the series has a missing
 103     value, i.e. what if your series are something like </p>
 104
 105     <table><tr>
 106     <td valign=top>
 107     <table>
 108       <table class=thinborder>
 109         <tr><th>x</th><th>A</th></tr>
 110         <tr><td>2</td><td>2</td></tr>
 111         <tr><td>4</td><td>4</td></tr>
 112         <tr><td>6</td><td>(gap)</td></tr>
 113         <tr><td>8</td><td>8</td></tr>
 114         <tr><td>10</td><td>10</td></tr>
 115       </table>
 116     </td>
 117     <td valign=top style="padding-left:25px;">
 118       <table class=thinborder>
 119         <tr><th>x</th><th>B</th></tr>
 120         <tr><td>1</td><td>3</td></tr>
 121         <tr><td>3</td><td>5</td></tr>
 122         <tr><td>5</td><td>7</td></tr>
 123       </table>
 124     </td>
 125     </tr></table>
 126
 127     <div id="graph2" style="float: right; margin-right: 50px; width: 400px; height: 300px;"></div>
 128     <p>The gap would normally be encoded as a null, or missing value. But when you use <code>connectSeparatedPoints</code>, that has a special meaning. Instead, you have to use <code>NaN</code>. This is a bit of a hack, but it gets the job done.</p>
 129
 130     <script type="text/javascript">
 131     g2 = new Dygraph(
 132       document.getElementById("graph2"),
 133 "x,A,B  \n" +
 134 "1,,3   \n" +
 135 "2,2,   \n" +
 136 "3,,5   \n" +
 137 "4,4,   \n" +
 138 "5,,7   \n" +
 139 "6,NaN, \n" +
 140 "8,8,   \n" +
 141 "10,10, \n"
 142       , {
 143         labels: ["x", "A", "B" ],
 144         connectSeparatedPoints: true,
 145         drawPoints: true
 146       }
 147     );
 148     </script>
 149
 150     <table><tr>
 151     <td valign=top>
 152     (CSV)
 153     <pre>x,A,B
 154 1,,3
 155 2,2,
 156 3,,5
 157 4,4,
 158 5,,7
 159 6,NaN,
 160 8,8,
 161 10,10,</pre>
 162     </td>
 163     <td valign=top style="padding-left: 25px;">
 164     (native)
 165     <pre>[ [1, null, 3],
 166   [2, 2, null],
 167   [3, null, 5],
 168   [4, 4, null],
 169   [5, null, 7],
 170   [6, NaN, null],
 171   [8, 8, null],
 172   [10, 10, null] ]</pre>
 173     </td>
 174     </tr></table>
 175
 176   </body>
 177 </html>