/// <summary>
/// Calculate the root mean sqaure value of array data. Supported data type: double/float/int.
/// </summary>
/// <param name="data">The array data to calculate statistic value.</param>
/// <typeparam name="TDataType">Supported data type: double/float/int.</typeparam>
/// <returns>The root mean square value of array data.</returns>
/// <exception cref="NotSupportedException">Supported data type: double/float/int.</exception>
public static double RootMeanSqaure <TDataType>(TDataType[] data)
{
double rootMeanSqure = double.NaN;
if (ReferenceEquals(typeof(TDataType), typeof(double)))
{
double[] doubleData = data as double[];
rootMeanSqure = ArrayStatistics.RootMeanSquare(doubleData);
}
else if (ReferenceEquals(typeof(TDataType), typeof(float)))
{
float[] floatData = data as float[];
rootMeanSqure = ArrayStatistics.RootMeanSquare(floatData);
}
else if (ReferenceEquals(typeof(TDataType), typeof(int)))
{
int[] intData = data as int[];
rootMeanSqure = ArrayStatistics.RootMeanSquare(intData);
}
else
{
throw new NotSupportedException("Unsupported data type.");
}
return(rootMeanSqure);
}
/// <summary>
/// Find the RMS value from the double array (supported platforms: MathNet)
/// </summary>
/// <param name="data">input data</param>
/// <returns>RMS value</returns>
public static double RMS(double[] data)
{
try
{
//IPP does not support RMS function yet
switch (Engine.Provider)
{
case ProviderEngine.MathNet:
return(ArrayStatistics.RootMeanSquare(data));
default:
return(ArrayStatistics.RootMeanSquare(data));
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
private double[] ApplyAggregationFunction(AggregationMethod method,
string argument,
int kernelSize,
double[] data,
double nanLimit,
ILogger logger)
{
var targetDatasetLength = data.Length / kernelSize;
var result = new double[targetDatasetLength];
switch (method)
{
case AggregationMethod.Mean:
Parallel.For(0, targetDatasetLength, x =>
{
var chunkData = this.GetNaNFreeData(data, x, kernelSize);
var isHighQuality = (chunkData.Length / (double)kernelSize) >= nanLimit;
if (isHighQuality)
{
result[x] = ArrayStatistics.Mean(chunkData);
}
else
{
result[x] = double.NaN;
}
});
break;
case AggregationMethod.MeanPolar:
double[] sin = new double[targetDatasetLength];
double[] cos = new double[targetDatasetLength];
double limit;
if (argument.Contains("*PI"))
{
limit = Double.Parse(argument.Replace("*PI", "")) * Math.PI;
}
else
{
limit = Double.Parse(argument);
}
var factor = 2 * Math.PI / limit;
Parallel.For(0, targetDatasetLength, x =>
{
var chunkData = this.GetNaNFreeData(data, x, kernelSize);
var length = chunkData.Length;
var isHighQuality = (length / (double)kernelSize) >= nanLimit;
if (isHighQuality)
{
for (int i = 0; i < chunkData.Length; i++)
{
sin[x] += Math.Sin(chunkData[i] * factor);
cos[x] += Math.Cos(chunkData[i] * factor);
}
result[x] = Math.Atan2(sin[x], cos[x]) / factor;
if (result[x] < 0)
{
result[x] += limit;
}
}
else
{
result[x] = double.NaN;
}
});
break;
case AggregationMethod.Min:
Parallel.For(0, targetDatasetLength, x =>
{
var chunkData = this.GetNaNFreeData(data, x, kernelSize);
var isHighQuality = (chunkData.Length / (double)kernelSize) >= nanLimit;
if (isHighQuality)
{
result[x] = ArrayStatistics.Minimum(chunkData);
}
else
{
result[x] = double.NaN;
}
});
break;
case AggregationMethod.Max:
Parallel.For(0, targetDatasetLength, x =>
{
var chunkData = this.GetNaNFreeData(data, x, kernelSize);
var isHighQuality = (chunkData.Length / (double)kernelSize) >= nanLimit;
if (isHighQuality)
{
result[x] = ArrayStatistics.Maximum(chunkData);
}
else
{
result[x] = double.NaN;
}
});
break;
case AggregationMethod.Std:
Parallel.For(0, targetDatasetLength, x =>
{
var chunkData = this.GetNaNFreeData(data, x, kernelSize);
var isHighQuality = (chunkData.Length / (double)kernelSize) >= nanLimit;
if (isHighQuality)
{
result[x] = ArrayStatistics.StandardDeviation(chunkData);
}
else
{
result[x] = double.NaN;
}
});
break;
case AggregationMethod.Rms:
Parallel.For(0, targetDatasetLength, x =>
{
var chunkData = this.GetNaNFreeData(data, x, kernelSize);
var isHighQuality = (chunkData.Length / (double)kernelSize) >= nanLimit;
if (isHighQuality)
{
result[x] = ArrayStatistics.RootMeanSquare(chunkData);
}
else
{
result[x] = double.NaN;
}
});
break;
case AggregationMethod.SampleAndHold:
Parallel.For(0, targetDatasetLength, x =>
{
var chunkData = this.GetNaNFreeData(data, x, kernelSize);
var isHighQuality = (chunkData.Length / (double)kernelSize) >= nanLimit;
if (isHighQuality)
{
result[x] = chunkData.First();
}
else
{
result[x] = double.NaN;
}
});
break;
case AggregationMethod.Sum:
Parallel.For(0, targetDatasetLength, x =>
{
var chunkData = this.GetNaNFreeData(data, x, kernelSize);
var isHighQuality = (chunkData.Length / (double)kernelSize) >= nanLimit;
if (isHighQuality)
{
result[x] = Vector <double> .Build.Dense(chunkData).Sum();
}
else
{
result[x] = double.NaN;
}
});
break;
default:
logger.LogWarning($"The aggregation method '{method}' is not known. Skipping period.");
break;
}
return(result);
}