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>Encoding a gap</h3>
 105     <p>There's one extra wrinkle. What if one of the series has a missing
 106     value, i.e. what if your series are something like </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>2</td><td>2</td></tr>
 114         <tr><td>4</td><td>4</td></tr>
 115         <tr><td>6</td><td>(gap)</td></tr>
 116         <tr><td>8</td><td>8</td></tr>
 117         <tr><td>10</td><td>10</td></tr>
 118       </table>
 119     </td>
 120     <td valign=top style="padding-left:25px;">
 121       <table class=thinborder>
 122         <tr><th>x</th><th>B</th></tr>
 123         <tr><td>1</td><td>3</td></tr>
 124         <tr><td>3</td><td>5</td></tr>
 125         <tr><td>5</td><td>7</td></tr>
 126       </table>
 127     </td>
 128     </tr></table>
 129
 130     <div id="graph3" style="float: right; margin-right: 50px; width: 400px; height: 300px;"></div>
 131     <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>
 132
 133     <script type="text/javascript">
 134     g2 = new Dygraph(
 135       document.getElementById("graph3"),
 136 "x,A,B  \n" +
 137 "1,,3   \n" +
 138 "2,2,   \n" +
 139 "3,,5   \n" +
 140 "4,4,   \n" +
 141 "5,,7   \n" +
 142 "6,NaN, \n" +
 143 "8,8,   \n" +
 144 "10,10, \n"
 145       , {
 146         connectSeparatedPoints: true,
 147         drawPoints: true
 148       }
 149     );
 150     </script>
 151
 152     <table><tr>
 153     <td valign=top>
 154     (CSV)
 155     <pre>x,A,B
 156 1,,3
 157 2,2,
 158 3,,5
 159 4,4,
 160 5,,7
 161 6,NaN,
 162 8,8,
 163 10,10,</pre>
 164     </td>
 165     <td valign=top style="padding-left: 25px;">
 166     (native)
 167     <pre>[ [1, null, 3],
 168   [2, 2, null],
 169   [3, null, 5],
 170   [4, 4, null],
 171   [5, null, 7],
 172   [6, NaN, null],
 173   [8, 8, null],
 174   [10, 10, null] ]</pre>
 175     </td>
 176     </tr></table>
 177
 178     <h3>Behavior at the edges of the panel for independent series</h3>
 179     <p> In case only a part of the whole data is visible (e.g. after zooming in) the lines are
 180     drawn to the respective next valid point outside the visible area. </p>
 181
 182     <table><tr>
 183     <td valign=top>
 184     <table>
 185       <table class=thinborder>
 186         <tr><th>x</th><th>A</th></tr>
 187         <tr><td>0</td><td>2</td></tr>
 188         <tr><td>1</td><td>3</td></tr>
 189         <tr><td>2</td><td>3</td></tr>
 190         <tr><td>4</td><td>4</td></tr>
 191         <tr><td>5</td><td>3</td></tr>
 192         <tr><td>6</td><td>3</td></tr>
 193         <tr><td>7</td><td>3</td></tr>
 194         <tr><td>8</td><td>4</td></tr>
 195       </table>
 196     </td>
 197     <td valign=top style="padding-left:25px;">
 198       <table class=thinborder>
 199         <tr><th>x</th><th>B</th></tr>
 200         <tr><td>0</td><td>1</td></tr>
 201         <tr><td>1</td><td>2</td></tr>
 202         <tr><td>2</td><td>1</td></tr>
 203         <tr><td>8</td><td>2</td></tr>
 204       </table>
 205     </td>
 206     </tr></table>
 207
 208     <div id="graph2" style="float: right; margin-right: 50px; width: 400px; height: 300px;"></div>
 209     <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.
 210     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>
 211     <p>Use double click to unzoom and see the currently invisible points</p>
 212
 213     <script type="text/javascript">
 214     g2 = new Dygraph(
 215       document.getElementById("graph2"),
 216 "x,A,B  \n" +
 217 "0,2,1   \n" +
 218 "1,3,2   \n" +
 219 "2,3,1   \n" +
 220 "3,,   \n" +
 221 "4,4,   \n" +
 222 "5,3,   \n" +
 223 "6,3,   \n" +
 224 "7,3,   \n" +
 225 "8,4,2   \n"
 226
 227       , {
 228         connectSeparatedPoints: true,
 229         drawPoints: true,
 230         pointSize: 3,
 231         highlightCircleSize: 5,
 232         dateWindow: [0,3]
 233       }
 234     );
 235     </script>
 236
 237     <table><tr>
 238     <td valign=top>
 239     Index
 240     <pre>&nbsp;
 241 0
 242 1
 243 2
 244 3
 245 4
 246 5
 247 6
 248 7
 249 8</pre>
 250     </td>
 251     <td valign=top>
 252     (CSV)
 253     <pre>x,A,B
 254 0,2,1
 255 1,3,2
 256 2,3,1
 257 3,,
 258 4,4,
 259 5,3,
 260 6,3,
 261 7,3,
 262 8,4,2</pre>
 263     </td>
 264     <td valign=top style="padding-left: 25px;">
 265     (native)
 266     <pre>[
 267   [0, 2, 1],
 268   [1, 3, 2],
 269   [2, 3, 1],
 270   [3, null, null],
 271   [4, 4, null],
 272   [5, 3, null],
 273   [6, 3, null],
 274   [7, 3, null],
 275   [8, 4, 2] ]</pre>
 276     </td>
 277     </tr></table>
 278
 279   </body>
 280 </html>