public static IEnumerable <Tuple <T, T> > ToRandomPairs <T>(this IEnumerable <T> source, IRando randy)
{
var srcList = source.ToList();
while (srcList.Count > 1)
{
var dex = randy.NextInt(srcList.Count);
var p1 = srcList[dex];
srcList.RemoveAt(dex); dex = randy.NextInt(srcList.Count);
var p2 = srcList[dex];
srcList.RemoveAt(dex);
yield return(new Tuple <T, T>(p1, p2));
}
}
public static IEnumerable <int> ToIntEnumerator(this IRando rando)
{
while (true)
{
yield return(rando.NextInt());
}
}
public static IEnumerable <IRando> ToRandomEnumerator(this IRando rando)
{
while (true)
{
yield return(Fast(rando.NextInt()));
}
}
public static IEnumerable <T> Pick <T>(this IRando rando, IReadOnlyList <T> items)
{
while (true)
{
yield return(items[rando.NextInt(items.Count)]);
}
}
public static GenomeSorterStageDimer Mutate(this GenomeSorterStageDimer genomeDimer, IRando rando)
{
var mutantIndex = rando.NextInt(genomeDimer.GenomeStageDimers.Length);
var gsdToReplace = genomeDimer.GenomeStageDimers[mutantIndex];
StageDimer gsdMutant = gsdToReplace.Mutate(rando);
return(genomeDimer.GenomeStageDimers
.ReplaceAtIndex((uint)mutantIndex, gsdMutant)
.ToGenomeDimer(Guid.NewGuid()));
}
public static IEnumerable <Tuple <T, T> > PairRandomly <T>(this IReadOnlyList <T> items, IRando rando)
{
var workingList = items.ToList();
if (workingList.Count % 2 == 1)
{
throw new ArgumentException("An odd number of items was sent to PairRandomly");
}
while (workingList.Any())
{
var nextIndex = rando.NextInt() % workingList.Count();
var itemA = workingList[nextIndex];
workingList.RemoveAt(nextIndex);
nextIndex = rando.NextInt() % workingList.Count();
var itemB = workingList[nextIndex];
workingList.RemoveAt(nextIndex);
yield return(new Tuple <T, T>(itemA, itemB));
}
}
public static T SelectFromRemaining <T>(this IRando rando, T[] values, bool[] rem)
{
while (true)
{
var dex = rando.NextInt(values.Length);
if (rem[dex])
{
rem[dex] = false;
return(values[dex]);
}
}
}
public static T[] FisherYatesShuffle <T>(this IReadOnlyList <T> origList, IRando rando)
{
var arrayLength = origList.Count;
var retArray = origList.ToArray();
for (var i = arrayLength - 1; i > 0; i--)
{
var j = rando.NextInt(i + 1);
var temp = retArray[i];
retArray[i] = retArray[j];
retArray[j] = temp;
}
return(retArray);
}
public static void SelectWithoutReplacement <T>(this IRando rando, T[] values, T[] trs)
{
if (trs.Length > values.Length)
{
throw new Exception("(trs.Length > values.Length) in SelectWithoutReplacement");
}
var l = values.ToList();
while (values.Length - l.Count < trs.Length)
{
var np = rando.NextInt(l.Count - 1);
trs[values.Length - l.Count] = values[np];
l.RemoveAt(np);
}
}
public static T[] FisherYatesPartialShuffle <T>(this IReadOnlyList <T> origList, IRando rando, double mixingRate)
{
var arrayLength = origList.Count;
var retArray = origList.ToArray();
for (var i = arrayLength - 1; i > 0; i--)
{
if (rando.NextDouble() > mixingRate)
{
continue;
}
var j = rando.NextInt(i + 1);
var temp = retArray[i];
retArray[i] = retArray[j];
retArray[j] = temp;
}
return(retArray);
}
public static GaData ToStageDimerGaData(
this IRando randy, uint order,
uint sorterCount, uint sortableCount, uint stageCount,
double sorterWinRate, double sortableWinRate)
{
var randomSortablePool = randy.ToRandomSortablePool(order, sortableCount);
var dimerGenomePool = randy.ToGenomePoolStageDimer(order, stageCount, sorterCount);
var d = new Dictionary <string, object>();
d.SetCurrentStep(0);
d.SetSeed(randy.NextInt());
d.SetSorterWinRate(sorterWinRate);
d.SetSortableWinRate(sortableWinRate);
d.SetSortablePool(randomSortablePool);
d.SetDimerGenomePool(dimerGenomePool);
return(new GaData(d));
}
public static GaData ToDirectGaSortingData(
this IRando randy, uint order,
uint sorterCount, uint sortableCount, uint stageCount,
double sorterWinRate, double sortableWinRate,
StageReplacementMode stageReplacementMode)
{
var randomSortablePool = randy.ToRandomSortablePool(order, sortableCount);
var randomSorterPool = randy.ToRandomSorterPool(order, stageCount, sorterCount);
var d = new Dictionary <string, object>();
d.SetCurrentStep(0);
d.SetSeed(randy.NextInt());
d.SetSorterWinRate(sorterWinRate);
d.SetSortableWinRate(sortableWinRate);
d.SetSortablePool(randomSortablePool);
d.SetSorterPool(randomSorterPool);
d.SetStageReplacementMode(stageReplacementMode);
return(new GaData(d));
}
public static IRando Spawn(this IRando rando)
{
return(new RandoFast(rando.NextInt()));
}
public static IEnumerable <Guid> ToGuidEnumerator(this IRando rando)
{
while (true)
{
yield return(new Guid
(
(uint)rando.NextInt(),
(ushort)rando.NextInt(),
(ushort)rando.NextInt(),
(byte)rando.NextInt(),
(byte)rando.NextInt(),
(byte)rando.NextInt(),
(byte)rando.NextInt(),
(byte)rando.NextInt(),
(byte)rando.NextInt(),
(byte)rando.NextInt(),
(byte)rando.NextInt()
));
}
}
public static Guid NextGuid(this IRando rando)
{
return(new Guid
(
(uint)rando.NextInt(),
(ushort)rando.NextInt(),
(ushort)rando.NextInt(),
(byte)rando.NextInt(),
(byte)rando.NextInt(),
(byte)rando.NextInt(),
(byte)rando.NextInt(),
(byte)rando.NextInt(),
(byte)rando.NextInt(),
(byte)rando.NextInt(),
(byte)rando.NextInt()
));
}