90 lines
3.3 KiB
C#
90 lines
3.3 KiB
C#
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using DTS.Common.Utilities;
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using DTS.Common.Utilities.SaeJ211;
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using System.Linq;
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namespace DTS.Utilities
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{
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public static class DataConditioning
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{
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/// <summary>
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/// returns an integer part of a string that might contain a decimal
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/// </summary>
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/// <param name="o"></param>
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/// <returns></returns>
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public static int GetIntegerIfPossible(object o)
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{
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if (null == o) { throw new System.Exception("expected non null input parameter"); }
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var s = o.ToString();
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var index = s.IndexOf(".");
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if (index == 0) { return 0; }
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if (index > 0) { s = s.Substring(0, index); }
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return int.Parse(s);
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}
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/// <summary>
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/// Gets Zered EU data given a time window to average
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/// </summary>
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/// <param name="euData"></param>
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/// <param name="sampleRate"></param>
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/// <param name="triggerSample"></param>
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/// <param name="startTime"></param>
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/// <param name="endTime"></param>
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/// <returns></returns>
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public static double[] GetAverageOverTimeEuData(
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double[] euData,
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double sampleRate,
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double triggerSample,
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double startTime,
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double endTime)
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{
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double[] zeroedEuData;
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var duration = endTime - startTime; //.3 - .2 = .1
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var startSample = (int)(triggerSample + (startTime * sampleRate));
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var endSample = (int)(startSample + (duration * sampleRate));
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var numSamples = endSample - startSample;
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if (numSamples <= 0) return euData;
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if (numSamples > euData.Length) return euData;
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var averagingSamples = new double[numSamples];
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var i = 0;
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for (var sampleNum = startSample; sampleNum < endSample; sampleNum++)
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{
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averagingSamples[i] = euData[sampleNum];
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i++;
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}
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var average = averagingSamples.Average();
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var zeroedDataIndex = 0;
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zeroedEuData = new double[euData.Length];
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foreach (var sample in euData)
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{
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zeroedEuData[zeroedDataIndex] = sample - average; //If average is a negative number, the sample will be increased
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zeroedDataIndex++;
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}
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return zeroedEuData;
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}
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public static double[] GetFilteredZeroedEUData(
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double[] euData,
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int filterRate,
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double sampleRate,
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double triggerSample,
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double startTime,
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double endTime)
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{
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return GetFilteredEUData(GetAverageOverTimeEuData(euData, sampleRate, triggerSample, startTime, endTime), filterRate, sampleRate);
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}
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public static double[] GetFilteredEUData(double[] euData, int filterRate, double sampleRate)
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{
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if (filterRate <= 0) return euData;
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var filterUtility = new FilterUtility
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{
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Cfc = ChannelFilter.AdHoc,
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AdHocFrequency = filterRate,
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SampleRate = sampleRate
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};
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var filteredData = filterUtility.ApplyFilter(euData);
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return filteredData;
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}
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}
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}
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