/// <summary>
/// Calculate masking bits for missing values.
/// </summary>
/// <param name="source">Input stream</param>
/// <param name="period">Period of input signal stream</param>
/// <param name="gap_tol">Gap tolerance</param>
/// <param name="offset">Offset</param>
/// <returns>Signal after missing values filled with `val`</returns>
public static IStreamable <Empty, bool> Mask(
this IStreamable <Empty, Signal> source,
long period,
long gap_tol,
long offset = 0)
{
return(source
.Chop(offset, period, gap_tol)
.Select((t, s) => t != s.ts)
);
}
/// <summary>
/// Fill missing values with a constant.
/// </summary>
/// <param name="source">Input stream</param>
/// <param name="period">Period of input signal stream</param>
/// <param name="gap_tol">Gap tolerance</param>
/// <param name="val">Filler value</param>
/// <param name="offset">Offset</param>
/// <returns>Signal after missing values filled with `val`</returns>
public static IStreamable <Empty, Signal> FillConst(
this IStreamable <Empty, Signal> source,
long period,
long gap_tol,
float val,
long offset = 0)
{
return(source
.Chop(offset, period, gap_tol)
.Select((t, s) => (t == s.ts) ? s : new Signal(t, val))
);
}