public Mail this[ulong id] => CollectionExtensions.GetValueOrDefault(_mails, id);
public Player Get(ulong accountId)
{
return(CollectionExtensions.GetValueOrDefault(_players, accountId));
}
private PropertyOverwrite GetPropertyOverwrite(Property property)
{
return(CollectionExtensions.GetValueOrDefault(_overwrite.PropertyOverwrites,
$"{property.DataClass.Name}.{property.Name}",
defaultValue: null));
}
private TaskOverwrite GetTaskOverwrite(Task task)
{
var overwriteName = task.Postfix == null ? string.Empty : char.ToLower(task.Postfix[index: 0]) + task.Postfix.Substring(startIndex: 1);
return(CollectionExtensions.GetValueOrDefault(_overwrite.TaskOverwrites, overwriteName, defaultValue: null));
}
/// <summary>
/// Returns the license or null if the license does not exist
/// </summary>
public License GetLicense(ItemLicense license)
{
return(CollectionExtensions.GetValueOrDefault(_licenses, license));
}
public Deny this[ulong accountId] => CollectionExtensions.GetValueOrDefault(_denies, accountId);
public Friend this[ulong accountId] => CollectionExtensions.GetValueOrDefault(_friends, accountId);
public static TType GetValueOrDefault <TType>(this Dictionary <string, object> dictionary, string key)
{
var value = CollectionExtensions.GetValueOrDefault(dictionary, key);
return((TType)value);
}
/// <summary>
/// Converts a dictionary of <see cref="ReturnsSymbolData"/> keyed by <see cref="Symbol"/> into a matrix
/// </summary>
/// <param name="symbolData">Dictionary of <see cref="ReturnsSymbolData"/> keyed by <see cref="Symbol"/> to be converted into a matrix</param>
/// <param name="symbols">List of <see cref="Symbol"/> to be included in the matrix</param>
public static double[,] FormReturnsMatrix(this Dictionary <Symbol, ReturnsSymbolData> symbolData, IEnumerable <Symbol> symbols)
{
var returnsByDate = (from s in symbols join sd in symbolData on s equals sd.Key select sd.Value.Returns).ToList();
// Consolidate by date
var alldates = returnsByDate.SelectMany(r => r.Keys).Distinct().ToList();
var max = symbolData.Count == 0 ? 0 : symbolData.Max(kvp => kvp.Value.Returns.Count);
// Perfect match between the dates in the ReturnsSymbolData objects
if (max == alldates.Count)
{
return(Accord.Math.Matrix.Create(alldates
// if a return date isn't found for a symbol we use 'double.NaN'
#if NETCORE
.Select(d => returnsByDate.Select(s => CollectionExtensions.GetValueOrDefault(s, d, double.NaN)).ToArray())
#else
.Select(d => returnsByDate.Select(s => s.GetValueOrDefault(d, double.NaN)).ToArray())
#endif
.Where(r => !r.Select(Math.Abs).Sum().IsNaNOrZero()) // remove empty rows
.ToArray()));
}
// If it is not a match, we assume that each index correspond to the same point in time
var returnsByIndex = returnsByDate.Select((doubles, i) => doubles.Values.ToArray());
return(Accord.Math.Matrix.Create(Enumerable.Range(0, max)
// there is no guarantee that all symbols have the same amount of returns so we need to check range and use 'double.NaN' if required as above
.Select(d => returnsByIndex.Select(s => s.Length < (d + 1) ? double.NaN : s[d]).ToArray())
.Where(r => !r.Select(Math.Abs).Sum().IsNaNOrZero()) // remove empty rows
.ToArray()));
}
