public List <double> GenerateDistances(DataTable points, EastingNorthingColumnIndexer indexer)
{
var centroid = new GroupCentroid(points, indexer);
var distances = new List <double>();
foreach (DataRow row in points.Rows)
{
distances.Add(this.calculator.Calculate(centroid.GetCentreCoordinates(),
new Coordinate((int)row[indexer.NorthingIndex], (int)row[indexer.EastingIndex])));
}
return(distances);
}
public List<double> GenerateDistances(DataTable points, EastingNorthingColumnIndexer indexer)
{
var centroid = new GroupCentroid(points, indexer);
var distances = new List<double>();
foreach (DataRow row in points.Rows)
{
distances.Add(this.calculator.Calculate(centroid.GetCentreCoordinates(),
new Coordinate((int)row[indexer.NorthingIndex], (int)row[indexer.EastingIndex])));
}
return distances;
}
/// <summary>
/// Calculates the distances of each point from the group centroid
/// </summary>
/// <param name="points">Datatable containing northings and eastings</param>
/// <param name="eastingIndex">Zero based column index for eastings</param>
/// <param name="northingIndex">Zero based column index for northings</param>
/// <returns>A list of distances from centroid</returns>
public List <double> GetIndividualDistances(DataTable points, EastingNorthingColumnIndexer indexer)
{
var centroid = new GroupCentroid(points, indexer);
int nullcases = 0;
List <double> results = new List <double>();
foreach (DataRow row in points.Rows)
{
try
{
results.Add(this.calculator.Calculate(centroid.GetCentreCoordinates(),
new Coordinate(Convert.ToInt32(row[indexer.NorthingIndex]), Convert.ToInt32(row[indexer.EastingIndex]))));
}
catch (InvalidCastException)
{
nullcases++;
}
}
return(results);
}
/// <summary>
/// Calculates the average distance of points from the centroid in one single pass
/// </summary>
/// <param name="points">Datatable containing northings and eastings</param>
/// <param name="eastingIndex">Zero based column index for eastings</param>
/// <param name="northingIndex">Zero based column index for northings</param>
/// <returns></returns>
public double AverageDistance(DataTable points, EastingNorthingColumnIndexer indexer)
{
var centroid = new GroupCentroid(points, indexer);
double runningTotal = 0;
int nullcases = 0;
foreach (DataRow row in points.Rows)
{
try
{
runningTotal += this.calculator.Calculate(centroid.GetCentreCoordinates(),
new Coordinate(Convert.ToInt32(row[indexer.NorthingIndex]), Convert.ToInt32(row[indexer.EastingIndex])));
}
catch (InvalidCastException)
{
nullcases++;
}
}
return(runningTotal / (points.Rows.Count - nullcases));
}
/// <summary>
/// Calculates the distances of each point from the group centroid
/// </summary>
/// <param name="points">Datatable containing northings and eastings</param>
/// <param name="eastingIndex">Zero based column index for eastings</param>
/// <param name="northingIndex">Zero based column index for northings</param>
/// <returns>A list of distances from centroid</returns>
public List<double> GetIndividualDistances(DataTable points, EastingNorthingColumnIndexer indexer)
{
var centroid = new GroupCentroid(points, indexer);
int nullcases = 0;
List<double> results = new List<double>();
foreach (DataRow row in points.Rows)
{
try
{
results.Add(this.calculator.Calculate(centroid.GetCentreCoordinates(),
new Coordinate(Convert.ToInt32(row[indexer.NorthingIndex]), Convert.ToInt32(row[indexer.EastingIndex]))));
}
catch (InvalidCastException)
{
nullcases++;
}
}
return results;
}
/// <summary>
/// Calculates the average distance of points from the centroid in one single pass
/// </summary>
/// <param name="points">Datatable containing northings and eastings</param>
/// <param name="eastingIndex">Zero based column index for eastings</param>
/// <param name="northingIndex">Zero based column index for northings</param>
/// <returns></returns>
public double AverageDistance(DataTable points, EastingNorthingColumnIndexer indexer)
{
var centroid = new GroupCentroid(points, indexer);
double runningTotal = 0;
int nullcases = 0;
foreach (DataRow row in points.Rows)
{
try
{
runningTotal += this.calculator.Calculate(centroid.GetCentreCoordinates(),
new Coordinate(Convert.ToInt32(row[indexer.NorthingIndex]), Convert.ToInt32(row[indexer.EastingIndex])));
}
catch (InvalidCastException)
{
nullcases++;
}
}
return runningTotal/(points.Rows.Count-nullcases);
}
private void CalculateCentroid(DataTable data, EastingNorthingColumnIndexer indexer)
{
var gen = new GroupCentroid(data, indexer);
centroid = gen.GetCentreCoordinates();
}
