tests/independent-series.html

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