/// <summary>Creates a CorrelationMatrix from the lines of a StreamReader</summary>
/// <remarks>
/// In the first line, we expect to be the number of entities.
/// All the other lines have the format
/// <pre>
/// EntityID1 EntityID2 Correlation
/// </pre>
/// where EntityID1 and EntityID2 are non-negative integers and Correlation is a floating point number.
/// </remarks>
/// <param name="reader">the StreamReader to read from</param>
static public CorrelationMatrix ReadCorrelationMatrix(StreamReader reader)
{
int num_entities = int.Parse(reader.ReadLine());
CorrelationMatrix cm = Create(num_entities);
// diagonal values
for (int i = 0; i < num_entities; i++)
{
cm[i, i] = 1;
}
var split_chars = new char[] { '\t', ' ', ',' };
while (!reader.EndOfStream)
{
string[] numbers = reader.ReadLine().Split(split_chars);
int i = int.Parse(numbers[0]);
int j = int.Parse(numbers[1]);
float c = float.Parse(numbers[2], CultureInfo.InvariantCulture);
if (i >= num_entities)
{
throw new IOException("Entity ID is too big: i = " + i);
}
if (j >= num_entities)
{
throw new IOException("Entity ID is too big: j = " + j);
}
cm[i, j] = c;
}
return(cm);
}
/// <summary>Creates a correlation matrix</summary>
/// <remarks>Gives out a useful warning if there is not enough memory</remarks>
/// <param name="num_entities">the number of entities</param>
/// <returns>the correlation matrix</returns>
static public CorrelationMatrix Create(int num_entities)
{
CorrelationMatrix cm;
try
{
cm = new CorrelationMatrix(num_entities);
}
catch (OverflowException)
{
Console.Error.WriteLine("Too many entities: " + num_entities);
throw;
}
return(cm);
}
/// <summary>Copy constructor. Creates an object of type Cosine from an existing correlation matrix</summary>
/// <param name ="correlation_matrix">the correlation matrix to copy</param>
public BinaryCosine(CorrelationMatrix correlation_matrix) : base(correlation_matrix.NumberOfRows)
{
this.data = correlation_matrix.data;
}
/// <summary>Copy constructor. Creates an object of type Jaccard from an existing correlation matrix</summary>
/// <param name ="correlation_matrix">the correlation matrix to copy</param>
public Jaccard(CorrelationMatrix correlation_matrix) : base(correlation_matrix.NumberOfRows)
{
this.data = correlation_matrix.data;
}