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<div class="subTitle">tech.v3.dataset</div>
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<h2 title="Class Rolling" class="title">Class Rolling</h2>
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<li>java.lang.Object</li>
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<li>tech.v3.dataset.Rolling</li>
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<pre>public class <span class="typeNameLabel">Rolling</span>
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extends java.lang.Object</pre>
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<div class="block"><p>Fixed and variable length rolling windows. For variable rolling windows the dataset must already be sorted by the target column. Datetime support is provided in terms of provide specific units in which to perform the rolling operation such as the keyword <code>:days</code>.</p></div>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#first-java.lang.Object-">first</a></span>(java.lang.Object colname)</code>
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<div class="block">reducer that keeps the first value</div>
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</td>
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</tr>
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<tr id="i1" class="rowColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#fixedWindow-long-">fixedWindow</a></span>(long windowSize)</code>
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<div class="block">Return fixed size rolling window.</div>
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</td>
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</tr>
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<tr id="i2" class="altColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#fixedWindow-long-clojure.lang.Keyword-">fixedWindow</a></span>(long windowSize,
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clojure.lang.Keyword winPos)</code>
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<div class="block">Return fixed size rolling window.</div>
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</td>
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</tr>
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<tr id="i3" class="rowColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#fixedWindow-long-clojure.lang.Keyword-clojure.lang.Keyword-">fixedWindow</a></span>(long windowSize,
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clojure.lang.Keyword winPos,
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clojure.lang.Keyword edgeMode)</code>
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<div class="block">Return fixed size rolling window.</div>
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</td>
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</tr>
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<tr id="i4" class="altColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#last-java.lang.Object-">last</a></span>(java.lang.Object colname)</code>
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<div class="block">reducer that keeps the last value</div>
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</td>
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</tr>
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<tr id="i5" class="rowColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#max-java.lang.Object-">max</a></span>(java.lang.Object colname)</code>
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<div class="block">max reducer</div>
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</td>
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</tr>
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<tr id="i6" class="altColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#mean-java.lang.Object-">mean</a></span>(java.lang.Object colname)</code>
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<div class="block">mean reducer</div>
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</td>
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</tr>
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<tr id="i7" class="rowColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#min-java.lang.Object-">min</a></span>(java.lang.Object colname)</code>
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<div class="block">min reducer</div>
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</td>
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</tr>
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<tr id="i8" class="altColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#reducer-java.lang.Object-clojure.lang.IFn-">reducer</a></span>(java.lang.Object srcColname,
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clojure.lang.IFn reduceFn)</code>
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<div class="block">Create a columnwise reducer eliding datatype parameter.</div>
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</td>
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</tr>
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<tr id="i9" class="rowColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#reducer-java.lang.Object-clojure.lang.IFn-clojure.lang.Keyword-">reducer</a></span>(java.lang.Object srcColname,
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clojure.lang.IFn reduceFn,
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clojure.lang.Keyword datatype)</code>
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<div class="block">Create a columnwise reducer.</div>
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</td>
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</tr>
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<tr id="i10" class="altColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#rolling-java.lang.Object-java.util.Map-java.util.Map-">rolling</a></span>(java.lang.Object ds,
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java.util.Map windowSpec,
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java.util.Map reducerMap)</code>
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<div class="block">Fixed or variable rolling window reductions.</div>
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</td>
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</tr>
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<tr id="i11" class="rowColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#stddev-java.lang.Object-">stddev</a></span>(java.lang.Object colname)</code>
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<div class="block">stddev reducer</div>
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</td>
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</tr>
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<tr id="i12" class="altColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#sum-java.lang.Object-">sum</a></span>(java.lang.Object colname)</code>
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<div class="block">sum reducer</div>
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</td>
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</tr>
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<tr id="i13" class="rowColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#variableWindow-java.lang.Object-double-">variableWindow</a></span>(java.lang.Object colname,
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double windowSize)</code>
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<div class="block">Create a variable window specification with a double windowsize for a particular column.</div>
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</td>
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</tr>
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<tr id="i14" class="altColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
|
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#variableWindow-java.lang.Object-double-clojure.lang.Keyword-">variableWindow</a></span>(java.lang.Object colname,
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double windowSize,
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clojure.lang.Keyword datetimeUnit)</code>
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<div class="block">Create a datetime-specific variable window specification with a double windowsize for a particular column.</div>
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</td>
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</tr>
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<tr id="i15" class="rowColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
|
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#variableWindow-java.lang.Object-double-java.lang.Object-">variableWindow</a></span>(java.lang.Object colname,
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double windowSize,
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java.lang.Object compFn)</code>
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<div class="block">Create a variable window specification with a double windowsize for a particular column and a compFn which must take two values and return a double.</div>
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</td>
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</tr>
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<tr id="i16" class="altColor">
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<td class="colFirst"><code>static java.util.Map</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../tech/v3/dataset/Rolling.html#variance-java.lang.Object-">variance</a></span>(java.lang.Object colname)</code>
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<div class="block">variance reducer</div>
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</td>
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</tr>
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</table>
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<h3>Methods inherited from class java.lang.Object</h3>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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</ul>
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<h3>Method Detail</h3>
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<a name="rolling-java.lang.Object-java.util.Map-java.util.Map-">
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<h4>rolling</h4>
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<pre>public static java.util.Map rolling(java.lang.Object ds,
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java.util.Map windowSpec,
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java.util.Map reducerMap)</pre>
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<div class="block"><p>Fixed or variable rolling window reductions.</p></div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>windowSpec</code> - Window specification specifying the type of window, either a window over a fixed number of rows or a window based on a fixed logical quantitative difference i.e. three months or 10 milliseconds.</dd>
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<dd><code>reducerMap</code> - map of dest column name to reducer where reducer is a map with two keys, :column-name which is the input column to use and :reducer which is an IFn that receives each window of data as a buffer.</p>
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<p>Example:</p>
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<pre><code class="java">Map stocks = makeDataset("https://github.com/techascent/tech.ml.dataset/raw/master/test/data/stocks.csv");
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//Variable-sized windows require the source column to be sorted.
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stocks = sortByColumn(stocks, "date");
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Map variableWin = Rolling.rolling(stocks,
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Rolling.variableWindow("date", 3, kw("months")),
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hashmap("price-mean-3m", Rolling.mean("price"),
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"price-max-3m", Rolling.max("price"),
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"price-min-3m", Rolling.min("price")));
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println(head(variableWin, 10));
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https://github.com/techascent/tech.ml.dataset/raw/master/test/data/stocks.csv [10 6]:
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//| symbol | date | price | price-max-3m | price-mean-3m | price-min-3m |
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//|--------|------------|-------:|-------------:|--------------:|-------------:|
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//| AAPL | 2000-01-01 | 25.94 | 106.11 | 58.92500000 | 25.94 |
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//| IBM | 2000-01-01 | 100.52 | 106.11 | 61.92363636 | 28.66 |
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//| MSFT | 2000-01-01 | 39.81 | 106.11 | 58.06400000 | 28.66 |
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//| AMZN | 2000-01-01 | 64.56 | 106.11 | 60.09222222 | 28.66 |
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//| AAPL | 2000-02-01 | 28.66 | 106.11 | 57.56583333 | 28.37 |
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//| MSFT | 2000-02-01 | 36.35 | 106.11 | 60.19363636 | 28.37 |
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//| IBM | 2000-02-01 | 92.11 | 106.11 | 62.57800000 | 28.37 |
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//| AMZN | 2000-02-01 | 68.87 | 106.11 | 59.29666667 | 28.37 |
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//| AMZN | 2000-03-01 | 67.00 | 106.11 | 54.65583333 | 21.00 |
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//| MSFT | 2000-03-01 | 43.22 | 106.11 | 53.53363636 | 21.00 |
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//Fixed window...
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Object radians = VecMath.mul(2.0*Math.PI, VecMath.div(range(33), 32.0));
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Map sinds = makeDataset(hashmap("radians", radians, "sin", VecMath.sin(radians)));
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Map fixedWin = Rolling.rolling(sinds,
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Rolling.fixedWindow(4),
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hashmap("sin-roll-mean", Rolling.mean("sin"),
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"sin-roll-max", Rolling.max("sin"),
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"sin-roll-min", Rolling.min("sin")));
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println(head(fixedWin, 8));
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//_unnamed [8 5]:
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//| sin | radians | sin-roll-max | sin-roll-min | sin-roll-mean |
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//|-----------:|-----------:|-------------:|-------------:|--------------:|
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//| 0.00000000 | 0.00000000 | 0.19509032 | 0.00000000 | 0.04877258 |
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//| 0.19509032 | 0.19634954 | 0.38268343 | 0.00000000 | 0.14444344 |
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//| 0.38268343 | 0.39269908 | 0.55557023 | 0.00000000 | 0.28333600 |
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//| 0.55557023 | 0.58904862 | 0.70710678 | 0.19509032 | 0.46011269 |
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//| 0.70710678 | 0.78539816 | 0.83146961 | 0.38268343 | 0.61920751 |
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//| 0.83146961 | 0.98174770 | 0.92387953 | 0.55557023 | 0.75450654 |
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//| 0.92387953 | 1.17809725 | 0.98078528 | 0.70710678 | 0.86081030 |
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//| 0.98078528 | 1.37444679 | 1.00000000 | 0.83146961 | 0.93403361 |
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</code></pre></dd>
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</dl>
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</li>
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<h4>variableWindow</h4>
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<pre>public static java.util.Map variableWindow(java.lang.Object colname,
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double windowSize)</pre>
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<div class="block"><p>Create a variable window specification with a double windowsize for a particular column. This specification will not work on datetime columns.</p></div>
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</li>
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</ul>
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<a name="variableWindow-java.lang.Object-double-java.lang.Object-">
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<h4>variableWindow</h4>
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<pre>public static java.util.Map variableWindow(java.lang.Object colname,
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double windowSize,
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java.lang.Object compFn)</pre>
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<div class="block"><p>Create a variable window specification with a double windowsize for a particular column and a compFn which must take two values and return a double. The function must take 2 arguments and the arguments are passed in as (later,earlier). This allows the basic clojure ‘-’ operator to work fine in many cases.</p></div>
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<div class="block"><p>Create a datetime-specific variable window specification with a double windowsize for a particular column.</p></div>
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<dd><code>datetimeUnit</code> - One of <code>[:milliseconds, :seconds, :hours, :days, :months]</code>.</dd>
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<pre>public static java.util.Map fixedWindow(long windowSize)</pre>
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<pre>public static java.util.Map fixedWindow(long windowSize,
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<div class="block"><p>Return fixed size rolling window. Window will be fixed over <code>window-size</code> rows.</p></div>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>winPos</code> - One of <code>[:left :center :right]</code>. This combined with the default edge mode of <code>:clamp</code> dictates the windows of data the reducer sees.</dd>
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clojure.lang.Keyword edgeMode)</pre>
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<div class="block"><p>Return fixed size rolling window. Window will be fixed over <code>window-size</code> rows.</p></div>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>winPos</code> - One of <code>[:left :center :right]</code>. This combined with the default edge mode dictates windows of data the reducer sees.</dd>
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<dd><code>edgeMode</code> - One of <code>[:zero, null, :clamp]</code>. Clamp means repeat the end value.</dd>
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<pre>public static java.util.Map reducer(java.lang.Object srcColname,
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clojure.lang.Keyword datatype)</pre>
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<div class="block"><p>Create a columnwise reducer. This reducer gets sub-windows from the column and must return a scalar value. If srcColname is a vector of colnames then reduceFn will be passed each column window as a separate argument.</p></div>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>datatype</code> - Option datatype, may be nil in which case the dataset will scan the result to infer datatype. If provided this will enforce the result column datatype. Reductions to numeric types with fixed datatypes will be slightly faster than generic reductions which require inference to find the final datatype.</dd>
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<pre>public static java.util.Map reducer(java.lang.Object srcColname,
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<div class="block"><p>Create a columnwise reducer eliding datatype parameter. See documentation on 3-arity form of function.</p></div>
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<pre>public static java.util.Map mean(java.lang.Object colname)</pre>
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<div class="block"><p>mean reducer</p></div>
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<pre>public static java.util.Map sum(java.lang.Object colname)</pre>
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<div class="block"><p>sum reducer</p></div>
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<pre>public static java.util.Map min(java.lang.Object colname)</pre>
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<div class="block"><p>min reducer</p></div>
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<pre>public static java.util.Map max(java.lang.Object colname)</pre>
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<div class="block"><p>max reducer</p></div>
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<pre>public static java.util.Map stddev(java.lang.Object colname)</pre>
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<div class="block"><p>stddev reducer</p></div>
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<pre>public static java.util.Map variance(java.lang.Object colname)</pre>
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<div class="block"><p>variance reducer</p></div>
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<pre>public static java.util.Map first(java.lang.Object colname)</pre>
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<div class="block"><p>reducer that keeps the first value</p></div>
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<pre>public static java.util.Map last(java.lang.Object colname)</pre>
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<div class="block"><p>reducer that keeps the last value</p></div>
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