tests/independent-series.html

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