/// <summary>
/// Given three of the four current channels, calculates the
/// missing channel based on the relationship IR = IA + IB + IC.
/// </summary>
/// <param name="meterInfo">Data context for accessing configuration tables in the database.</param>
public DataSeries CalculateMissingCurrentChannel()
{
Meter meter;
DataSeries missingSeries;
// If the data group does not have exactly 3 channels,
// then there is no missing channel or there is not
// enough data to calculate the missing channel
if (DefinedCurrents != 3)
{
return(null);
}
// Get the meter associated with the channels in this data group
meter = (I1 ?? I2).SeriesInfo.Channel.Meter;
if (m_i1Index == -1)
{
// Calculate I1 = IR - I2 - I3
missingSeries = IR.Add(I2.Negate()).Add(I3.Negate());
missingSeries.SeriesInfo = GetSeriesInfo(meter, m_dataGroup, "Current", "General1");
m_i1Index = m_dataGroup.DataSeries.Count;
m_dataGroup.Add(missingSeries);
}
else if (m_i2Index == -1)
{
// Calculate I2 = IR - I1 - I3
missingSeries = IR.Add(I1.Negate()).Add(I3.Negate());
missingSeries.SeriesInfo = GetSeriesInfo(meter, m_dataGroup, "Current", "General2");
m_i1Index = m_dataGroup.DataSeries.Count;
m_dataGroup.Add(missingSeries);
}
else if (m_i3Index == -1)
{
// Calculate I3 = IR - I1 - I2
missingSeries = IR.Add(I1.Negate()).Add(I2.Negate());
missingSeries.SeriesInfo = GetSeriesInfo(meter, m_dataGroup, "Current", "General3");
m_i1Index = m_dataGroup.DataSeries.Count;
m_dataGroup.Add(missingSeries);
}
else
{
// Calculate IR = I1 + I2 + I3
missingSeries = I1.Add(I2).Add(I3);
missingSeries.SeriesInfo = GetSeriesInfo(meter, m_dataGroup, "Current", "RES");
m_i1Index = m_dataGroup.DataSeries.Count;
m_dataGroup.Add(missingSeries);
}
return(missingSeries);
}