NANFILLTS Fill NaNs in the time series with the previous valid observation
NANFILLTS(TSPANEL) TSPANEL should be a numeric matrix (or a vector)
where each series is a column with the oldest
observations in the first row (element) and the
most recent ones in the last row (element).
NANFILLTS(..., NOTRAIL) To avoid extrapolation of the last value of a
time series till the end of the panel, set
NOTRAIL to true (1). By default is false (0).
TSPANEL = NANFILLTS(...) Returns the same matrix with filled NaNs.
NOTE: leading NaNs are left untouched.
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