| 1 | <html> |
| 2 | <head> |
| 3 | <title>Independent Series</title> |
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| 29 | <body> |
| 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 | 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="graph2" 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("graph2"), |
| 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 | labels: ["x", "A", "B" ], |
| 143 | connectSeparatedPoints: true, |
| 144 | drawPoints: true |
| 145 | } |
| 146 | ); |
| 147 | </script> |
| 148 | |
| 149 | <table><tr> |
| 150 | <td valign=top> |
| 151 | (CSV) |
| 152 | <pre>x,A,B |
| 153 | 1,,3 |
| 154 | 2,2, |
| 155 | 3,,5 |
| 156 | 4,4, |
| 157 | 5,,7 |
| 158 | 6,NaN, |
| 159 | 8,8, |
| 160 | 10,10,</pre> |
| 161 | </td> |
| 162 | <td valign=top style="padding-left: 25px;"> |
| 163 | (native) |
| 164 | <pre>[ [1, null, 3], |
| 165 | [2, 2, null], |
| 166 | [3, null, 5], |
| 167 | [4, 4, null], |
| 168 | [5, null, 7], |
| 169 | [6, NaN, null], |
| 170 | [8, 8, null], |
| 171 | [10, 10, null] ]</pre> |
| 172 | </td> |
| 173 | </tr></table> |
| 174 | |
| 175 | </body> |
| 176 | </html> |