tests/independent-series.html

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  34     <h3>Independent Series</h3>
  35     <p>By using the connectSeparated attribute, it's possible to display a chart of several time series with completely independent x-values.</p>
  36
  37     <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>
  38
  39     <div id="graph" style="float: right; margin-right: 50px; width: 400px; height: 300px;"></div>
  40     <p>For example, say you had two series:</p>
  41     <table><tr>
  42     <td valign=top>
  43     <table>
  44       <table class=thinborder>
  45         <tr><th>x</th><th>A</th></tr>
  46         <tr><td>2</td><td>2</td></tr>
  47         <tr><td>4</td><td>6</td></tr>
  48         <tr><td>6</td><td>4</td></tr>
  49       </table>
  50     </td>
  51     <td valign=top style="padding-left:25px;">
  52       <table class=thinborder>
  53         <tr><th>x</th><th>B</th></tr>
  54         <tr><td>1</td><td>3</td></tr>
  55         <tr><td>3</td><td>7</td></tr>
  56         <tr><td>5</td><td>5</td></tr>
  57       </table>
  58     </td>
  59     </tr></table>
  60
  61     <p>Then you would specify the following CSV or native data:</p>
  62     <table><tr>
  63     <td valign=top>
  64     (CSV)
  65     <pre>X,A,B
  66 1,,3
  67 2,2,
  68 3,,7
  69 4,6,
  70 5,,5
  71 6,4,</pre>
  72     </td>
  73     <td valign=top style="padding-left: 25px;">
  74     (native)
  75     <pre>[
  76 [1, null, 3],
  77 [2, 2, null],
  78 [3, null, 7],
  79 [4, 6, null],
  80 [5, null, 5],
  81 [6, 4, null] ]</pre>
  82     </td>
  83     </tr></table>
  84
  85     <script type="text/javascript">
  86     var g1 = new Dygraph(
  87       document.getElementById("graph"),
  88       [
  89         [1, null, 3],
  90         [2, 2, null],
  91         [3, null, 7],
  92         [4, 5, null],
  93         [5, null, 5],
  94         [6, 3, null]
  95       ],
  96       {
  97         labels: ["x", "A", "B" ],
  98         connectSeparatedPoints: true,
  99         drawPoints: true
 100       }
 101     );
 102     </script>
 103
 104     <h3>Behavior at the edges of the panel for independent series</h3>
 105     <p> In case only a part of the whole data is visible (e.g. after zooming in) the lines are
 106     drawn to the respective next valid point outside the visible area. </p>
 107
 108     <table><tr>
 109     <td valign=top>
 110     <table>
 111       <table class=thinborder>
 112         <tr><th>x</th><th>A</th></tr>
 113         <tr><td>0</td><td>2</td></tr>
 114         <tr><td>1</td><td>3</td></tr>
 115         <tr><td>2</td><td>3</td></tr>
 116         <tr><td>4</td><td>4</td></tr>
 117         <tr><td>5</td><td>3</td></tr>
 118         <tr><td>6</td><td>3</td></tr>
 119         <tr><td>7</td><td>3</td></tr>
 120         <tr><td>8</td><td>4</td></tr>
 121       </table>
 122     </td>
 123     <td valign=top style="padding-left:25px;">
 124       <table class=thinborder>
 125         <tr><th>x</th><th>B</th></tr>
 126         <tr><td>0</td><td>1</td></tr>
 127         <tr><td>1</td><td>2</td></tr>
 128         <tr><td>2</td><td>1</td></tr>
 129         <tr><td>8</td><td>2</td></tr>
 130       </table>
 131     </td>
 132     </tr></table>
 133
 134     <div id="graph2" style="float: right; margin-right: 50px; width: 400px; height: 300px;"></div>
 135     <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.
 136     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>
 137     <p>Use double click to unzoom and see the currently invisible points</p>
 138
 139     <script type="text/javascript">
 140     g2 = new Dygraph(
 141       document.getElementById("graph2"),
 142 "x,A,B  \n" +
 143 "0,2,1   \n" +
 144 "1,3,2   \n" +
 145 "2,3,1   \n" +
 146 "3,,   \n" +
 147 "4,4,   \n" +
 148 "5,3,   \n" +
 149 "6,3,   \n" +
 150 "7,3,   \n" +
 151 "8,4,2   \n"
 152
 153       , {
 154         connectSeparatedPoints: true,
 155         drawPoints: true,
 156         pointSize: 3,
 157         highlightCircleSize: 5,
 158         dateWindow: [0,3]
 159       }
 160     );
 161     </script>
 162
 163     <table><tr>
 164     <td valign=top>
 165     Index
 166     <pre>&nbsp;
 167 0
 168 1
 169 2
 170 3
 171 4
 172 5
 173 6
 174 7
 175 8</pre>
 176     </td>
 177     <td valign=top>
 178     (CSV)
 179     <pre>x,A,B
 180 0,2,1
 181 1,3,2
 182 2,3,1
 183 3,,
 184 4,4,
 185 5,3,
 186 6,3,
 187 7,3,
 188 8,4,2</pre>
 189     </td>
 190     <td valign=top style="padding-left: 25px;">
 191     (native)
 192     <pre>[
 193   [0, 2, 1],
 194   [1, 3, 2],
 195   [2, 3, 1],
 196   [3, null, null],
 197   [4, 4, null],
 198   [5, 3, null],
 199   [6, 3, null],
 200   [7, 3, null],
 201   [8, 4, 2] ]</pre>
 202     </td>
 203     </tr></table>
 204
 205     <h3>Encoding a gap</h3>
 206     <p>There's one extra wrinkle. What if one of the series has a missing
 207     value, i.e. what if your series are something like </p>
 208
 209     <table><tr>
 210     <td valign=top>
 211     <table>
 212       <table class=thinborder>
 213         <tr><th>x</th><th>A</th></tr>
 214         <tr><td>2</td><td>2</td></tr>
 215         <tr><td>4</td><td>4</td></tr>
 216         <tr><td>6</td><td>(gap)</td></tr>
 217         <tr><td>8</td><td>8</td></tr>
 218         <tr><td>10</td><td>10</td></tr>
 219       </table>
 220     </td>
 221     <td valign=top style="padding-left:25px;">
 222       <table class=thinborder>
 223         <tr><th>x</th><th>B</th></tr>
 224         <tr><td>1</td><td>3</td></tr>
 225         <tr><td>3</td><td>5</td></tr>
 226         <tr><td>5</td><td>7</td></tr>
 227       </table>
 228     </td>
 229     </tr></table>
 230
 231     <div id="graph3" style="float: right; margin-right: 50px; width: 400px; height: 300px;"></div>
 232     <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>
 233
 234     <script type="text/javascript">
 235     g2 = new Dygraph(
 236       document.getElementById("graph3"),
 237 "x,A,B  \n" +
 238 "1,,3   \n" +
 239 "2,2,   \n" +
 240 "3,,5   \n" +
 241 "4,4,   \n" +
 242 "5,,7   \n" +
 243 "6,NaN, \n" +
 244 "8,8,   \n" +
 245 "10,10, \n"
 246       , {
 247         connectSeparatedPoints: true,
 248         drawPoints: true
 249       }
 250     );
 251     </script>
 252
 253     <table><tr>
 254     <td valign=top>
 255     (CSV)
 256     <pre>x,A,B
 257 1,,3
 258 2,2,
 259 3,,5
 260 4,4,
 261 5,,7
 262 6,NaN,
 263 8,8,
 264 10,10,</pre>
 265     </td>
 266     <td valign=top style="padding-left: 25px;">
 267     (native)
 268     <pre>[ [1, null, 3],
 269   [2, 2, null],
 270   [3, null, 5],
 271   [4, 4, null],
 272   [5, null, 7],
 273   [6, NaN, null],
 274   [8, 8, null],
 275   [10, 10, null] ]</pre>
 276     </td>
 277     </tr></table>
 278
 279   </body>
 280 </html>