public static IDensity <G, M, RF> KeepLowest <G, M, RF>(this MultiDensity <G, M, RF> d, int n = 1)
where G :
IAdditiveMonoid <M>
{
var g = d.BaseStructure;
if (n < 0)
{
return(d.KeepHighest(-n));
}
IDensity <G, M, RF> resDensity;
if (n == 0)
{
resDensity = new Zero <G, M, RF>(g, d.RealField);
}
else if (n == 1)
{
resDensity = d.MultiOp <G, M>(g, en => g.Min(en));
resDensity.Name = d.Name + $".KeepLowest({n})";
}
else
{
resDensity = d.MultiOp <G, M>(g, en => g.SumNSmallest(en, n));
resDensity.Name = d.Name + $".KeepLowest({n})";
}
return(resDensity);
}
public static IDensity <G, M, RF> DropLowest <G, M, RF>(this MultiDensity <G, M, RF> d, int n = 1)
where G :
IAdditiveMonoid <M>
{
var g = d.BaseStructure;
var remaining = Math.Min(0, d.DensityList.Count() - n);
if (n < 0)
{
return(d.DropHighest(-n));
}
IDensity <G, M, RF> resDensity;
if (remaining == 0)
{
resDensity = new Zero <G, M, RF>(g, d.RealField);
}
else if (n == 0)
{
resDensity = d.AsSummedDensity();
resDensity.Name = d.Name + $".DropLowest({n})";
}
else
{
resDensity = d.MultiOp <G, M>(g, en => g.SumNLargest(en, remaining));
resDensity.Name = d.Name + $".DropLowest({n})";
}
return(resDensity);
}
public static MultiDensity <G, M, RF> AsMultiDensity <G, M, RF>(this IDensity <G, M, RF> d, int n)
where G :
IAdditiveMonoid <M>
{
var dList = Enumerable.Repeat(d, n).ToList();
var multiDensity = new MultiDensity <G, M, RF>(dList);
return(multiDensity);
}
