public static DataSeries <Value> Extrapolate(this DataSeries <Value> orig)
{
var slope = orig.Derivative();
return(orig.ZipElements <Value, Value>(slope, (o, s, v) => {
if (o.Pos == 0)
{
return o[0].Val;
}
if (o.Pos == 1)
{
return o[1].Val;
}
return o[1] + s[1];
}));
}
