LargestTriangleThreeBuckets | Javadocs [I2P+]

java.lang.Object

eu.bengreen.data.utility.DownSampleImpl

eu.bengreen.data.utility.LargestTriangleThreeBuckets

All Implemented Interfaces:: DownSampler

public class LargestTriangleThreeBucketsextends DownSampleImpl

First implementation of 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
LargestTriangleThreeBuckets(int threshold)
Create a downsampler that reduces a series to at most this many points, choosing each point by the largest-triangle-three-buckets rule.
Method Summary
All Methods
Modifier and Type
Method
Description
DownSampler.DataSet
downsizeImpl(DownSampler.DataSet sampled, long[] timestamps, double[] values)
Reduces the source series into the pre-allocated output set.
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
- LargestTriangleThreeBuckets
  public LargestTriangleThreeBuckets(int threshold)
  Create a downsampler that reduces a series to at most this many points, choosing each point by the largest-triangle-three-buckets rule.
  Parameters:
  threshold - the number of buckets to downsample to
Method Details
- downsizeImpl
  public DownSampler.DataSet downsizeImpl(DownSampler.DataSet sampled, long[] timestamps, double[] values)
  Description copied from class: DownSampleImpl
  Reduces the source series into the pre-allocated output set. Implementations pick the ranks to keep, write them one slot at a time with DownSampleImpl.setDataSetLine(DownSampler.DataSet, int, long, double), and return that same set; DownSampleImpl.downsize(long[], double[]) has already rejected inputs shorter than the output and mismatched array lengths.
  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