org.apache.spark.api.java.function.DoubleFunction Java Examples
The following examples show how to use
org.apache.spark.api.java.function.DoubleFunction.
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Example #1
Source File: ChronixRDD.java From chronix.spark with Apache License 2.0 | 5 votes |
/** * Action: Calculates the slope of a linear regression of every time series. * * Where: value = slope * timestamp * .. or: y = slope * x * * @return the slopes (simple linear regression) of each an every time series in the RDD */ public JavaDoubleRDD getSlopes() { return this.mapToDouble((DoubleFunction<MetricTimeSeries>) mts -> { SimpleRegression regression = new SimpleRegression(); mts.points().forEach(p -> regression.addData(p.getTimestamp(), p.getValue())); return regression.getSlope(); } ); }
Example #2
Source File: ChronixRDD.java From chronix.spark with Apache License 2.0 | 4 votes |
/** * Action: Counts the number of observations. * * @return the number of overall observations in all time series */ public long countObservations() { JavaDoubleRDD sizesRdd = this.mapToDouble( (DoubleFunction<MetricTimeSeries>) value -> (double) value.size()); return sizesRdd.sum().longValue(); }