public override IOperation Apply()
{
ItemArray <StringValue> exceptions = ExceptionTreeParameter.ActualValue;
double count = exceptions.Count();
ResultCollection results = ResultsParameter.ActualValue;
DataTable exceptionFrequencies = ExceptionFrequenciesParameter.ActualValue;
if (exceptionFrequencies == null)
{
exceptionFrequencies = new DataTable("Exception frequencies", "Relative frequency of exception aggregated over the whole population.");
exceptionFrequencies.VisualProperties.YAxisTitle = "Relative Exception Frequency";
ExceptionFrequenciesParameter.ActualValue = exceptionFrequencies;
results.Add(new Result("Exception frequencies", exceptionFrequencies));
}
// all rows must have the same number of values so we can just take the first
int numberOfValues = exceptionFrequencies.Rows.Select(r => r.Values.Count).DefaultIfEmpty().First();
foreach (var pair in exceptions.GroupBy(x => x.Value).ToDictionary(g => g.Key, g => (double)g.Count() / count))
{
string key = String.IsNullOrEmpty(pair.Key) ? "No Exception" : pair.Key;
if (!exceptionFrequencies.Rows.ContainsKey(key))
{
// initialize a new row for the symbol and pad with zeros
DataRow row = new DataRow(key, "", Enumerable.Repeat(0.0, numberOfValues));
row.VisualProperties.StartIndexZero = true;
exceptionFrequencies.Rows.Add(row);
}
exceptionFrequencies.Rows[key].Values.Add(Math.Round(pair.Value, 3));
}
// add a zero for each data row that was not modified in the previous loop
foreach (var row in exceptionFrequencies.Rows.Where(r => r.Values.Count != numberOfValues + 1))
{
row.Values.Add(0.0);
}
return(base.Apply());
}