LargestTriangleThreeBucketsTime | Javadocs [I2P+]

java.lang.Object

eu.bengreen.data.utility.DownSampleImpl

eu.bengreen.data.utility.LargestTriangleThreeBucketsTime

All Implemented Interfaces:: DownSampler

public class LargestTriangleThreeBucketsTimeextends DownSampleImpl

A variation of the Largest-Triangle-Three-Buckets.

Modified by Fabrice Bacchella for NaN support.

Nested Class Summary
Nested classes/interfaces inherited from interface DownSampler
DownSampler.DataSet
Modifier and Type
Interface
Description
static class
DownSampler.DataSet
Represents a dataset containing timestamps and corresponding values.
Field Summary
Fields inherited from class DownSampleImpl
threshold
Modifier and Type
Field
Description
protected final int
threshold
Number of data points to downsample to.
Constructor Summary
Constructors
Constructor
Description
LargestTriangleThreeBucketsTime(int threshold)
Builds a downsampler that reduces a time series to the requested point count.
Method Summary
All Methods
Modifier and Type
Method
Description
DownSampler.DataSet
downsizeImpl(DownSampler.DataSet sampled, long[] timestamps, double[] values)
Keeps the largest-area point of each time bucket, preserving the series shape.
Methods inherited from class DownSampleImpl
downsize, setDataSetLine
Modifier and Type
Method
Description
DownSampler.DataSet
downsize(long[] timestamps, double[] values)
Downsample the given data.
protected void
setDataSetLine(DownSampler.DataSet sampled, int rank, long timestamp, double value)
Populate a single element in the downsampled data set.
Methods inherited from class Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details
- LargestTriangleThreeBucketsTime
  public LargestTriangleThreeBucketsTime(int threshold)
  Builds a downsampler that reduces a time series to the requested point count.
  Parameters:
  threshold - the number of points to downsize the series to
Method Details
- downsizeImpl
  public DownSampler.DataSet downsizeImpl(DownSampler.DataSet sampled, long[] timestamps, double[] values)
  Keeps the largest-area point of each time bucket, preserving the series shape.
  Specified by:
  downsizeImpl in class DownSampleImpl
  Parameters:
  sampled - the empty output set allocated by DownSampleImpl.downsize(long[], double[]), holding exactly threshold timestamp and value slots to fill
  timestamps - the full source timestamps in seconds since the epoch, more than threshold in number
  values - the full source values, the same length as timestamps
  Returns:
  the same sampled set, with the threshold chosen ranks written into it