tests/independent-series.html

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   4     <title>Independent Series</title>
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  30     <h3>Independent Series</h3>
  31     <p>By using the connectSeparated attribute, it's possible to display a chart of several time series with completely independent x-values.</p>
  32
  33     <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>
  34
  35     <div id="graph" style="float: right; margin-right: 50px; width: 400px; height: 300px;"></div>
  36     <p>For example, say you had two series:</p>
  37     <table><tr>
  38     <td valign=top>
  39     <table>
  40       <table class=thinborder>
  41         <tr><th>x</th><th>A</th></tr>
  42         <tr><td>2</td><td>2</td></tr>
  43         <tr><td>4</td><td>6</td></tr>
  44         <tr><td>6</td><td>4</td></tr>
  45       </table>
  46     </td>
  47     <td valign=top style="padding-left:25px;">
  48       <table class=thinborder>
  49         <tr><th>x</th><th>B</th></tr>
  50         <tr><td>1</td><td>3</td></tr>
  51         <tr><td>3</td><td>7</td></tr>
  52         <tr><td>5</td><td>5</td></tr>
  53       </table>
  54     </td>
  55     </tr></table>
  56
  57     <p>Then you would specify the following CSV or native data:</p>
  58     <table><tr>
  59     <td valign=top>
  60     (CSV)
  61     <pre>X,A,B
  62 1,,3
  63 2,2,
  64 3,,7
  65 4,6,
  66 5,,5
  67 6,4,</pre>
  68     </td>
  69     <td valign=top style="padding-left: 25px;">
  70     (native)
  71     <pre>[
  72 [1, null, 3],
  73 [2, 2, null],
  74 [3, null, 7],
  75 [4, 6, null],
  76 [5, null, 5],
  77 [6, 4, null] ]</pre>
  78     </td>
  79     </tr></table>
  80
  81     <script type="text/javascript">
  82     var g1 = new Dygraph(
  83       document.getElementById("graph"),
  84       [
  85         [1, null, 3],
  86         [2, 2, null],
  87         [3, null, 7],
  88         [4, 5, null],
  89         [5, null, 5],
  90         [6, 3, null]
  91       ],
  92       {
  93         labels: ["x", "A", "B" ],
  94         connectSeparatedPoints: true,
  95         drawPoints: true
  96       }
  97     );
  98     </script>
  99
 100     <h3>Encoding a gap</h3>
 101     <p>There's one extra wrinkle. What if one of the series has a missing
 102     value, i.e. what if your series are something like </p>
 103
 104     <table><tr>
 105     <td valign=top>
 106     <table>
 107       <table class=thinborder>
 108         <tr><th>x</th><th>A</th></tr>
 109         <tr><td>2</td><td>2</td></tr>
 110         <tr><td>4</td><td>4</td></tr>
 111         <tr><td>6</td><td>(gap)</td></tr>
 112         <tr><td>8</td><td>8</td></tr>
 113         <tr><td>10</td><td>10</td></tr>
 114       </table>
 115     </td>
 116     <td valign=top style="padding-left:25px;">
 117       <table class=thinborder>
 118         <tr><th>x</th><th>B</th></tr>
 119         <tr><td>1</td><td>3</td></tr>
 120         <tr><td>3</td><td>5</td></tr>
 121         <tr><td>5</td><td>7</td></tr>
 122       </table>
 123     </td>
 124     </tr></table>
 125
 126     <div id="graph3" style="float: right; margin-right: 50px; width: 400px; height: 300px;"></div>
 127     <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>
 128
 129     <script type="text/javascript">
 130     g2 = new Dygraph(
 131       document.getElementById("graph3"),
 132 "x,A,B  \n" +
 133 "1,,3   \n" +
 134 "2,2,   \n" +
 135 "3,,5   \n" +
 136 "4,4,   \n" +
 137 "5,,7   \n" +
 138 "6,NaN, \n" +
 139 "8,8,   \n" +
 140 "10,10, \n"
 141       , {
 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
 174     <h3>Behavior at the edges of the panel for independent series</h3>
 175     <p> In case only a part of the whole data is visible (e.g. after zooming in) the lines are
 176     drawn to the respective next valid point outside the visible area. </p>
 177
 178     <table><tr>
 179     <td valign=top>
 180     <table>
 181       <table class=thinborder>
 182         <tr><th>x</th><th>A</th></tr>
 183         <tr><td>0</td><td>2</td></tr>
 184         <tr><td>1</td><td>3</td></tr>
 185         <tr><td>2</td><td>3</td></tr>
 186         <tr><td>4</td><td>4</td></tr>
 187         <tr><td>5</td><td>3</td></tr>
 188         <tr><td>6</td><td>3</td></tr>
 189         <tr><td>7</td><td>3</td></tr>
 190         <tr><td>8</td><td>4</td></tr>
 191       </table>
 192     </td>
 193     <td valign=top style="padding-left:25px;">
 194       <table class=thinborder>
 195         <tr><th>x</th><th>B</th></tr>
 196         <tr><td>0</td><td>1</td></tr>
 197         <tr><td>1</td><td>2</td></tr>
 198         <tr><td>2</td><td>1</td></tr>
 199         <tr><td>8</td><td>2</td></tr>
 200       </table>
 201     </td>
 202     </tr></table>
 203
 204     <div id="graph2" style="float: right; margin-right: 50px; width: 400px; height: 300px;"></div>
 205     <p>Both graphs have no value at the right edge of the panel (x=3). The lines that are drawn to the right edge are determined by their respective next valid value outside the visible area.
 206     Therefore it is neither necessary that the next valid values are on the same point nor that they have the same index (index 4 for the green line and index 8 for the blue line).</p>
 207     <p>Use double click to unzoom and see the currently invisible points</p>
 208
 209     <script type="text/javascript">
 210     g2 = new Dygraph(
 211       document.getElementById("graph2"),
 212 "x,A,B  \n" +
 213 "0,2,1   \n" +
 214 "1,3,2   \n" +
 215 "2,3,1   \n" +
 216 "3,,   \n" +
 217 "4,4,   \n" +
 218 "5,3,   \n" +
 219 "6,3,   \n" +
 220 "7,3,   \n" +
 221 "8,4,2   \n"
 222
 223       , {
 224         connectSeparatedPoints: true,
 225         drawPoints: true,
 226         pointSize: 3,
 227         highlightCircleSize: 5,
 228         dateWindow: [0,3]
 229       }
 230     );
 231     </script>
 232
 233     <table><tr>
 234     <td valign=top>
 235     Index
 236     <pre>&nbsp;
 237 0
 238 1
 239 2
 240 3
 241 4
 242 5
 243 6
 244 7
 245 8</pre>
 246     </td>
 247     <td valign=top>
 248     (CSV)
 249     <pre>x,A,B
 250 0,2,1
 251 1,3,2
 252 2,3,1
 253 3,,
 254 4,4,
 255 5,3,
 256 6,3,
 257 7,3,
 258 8,4,2</pre>
 259     </td>
 260     <td valign=top style="padding-left: 25px;">
 261     (native)
 262     <pre>[
 263   [0, 2, 1],
 264   [1, 3, 2],
 265   [2, 3, 1],
 266   [3, null, null],
 267   [4, 4, null],
 268   [5, 3, null],
 269   [6, 3, null],
 270   [7, 3, null],
 271   [8, 4, 2] ]</pre>
 272     </td>
 273     </tr></table>
 274
 275   </body>
 276 </html>