FLAG_IMPLICIT_SKIP_NAN sets and gets default mode for handling NaNs
1 skips NaN's (the default mode if no mode is set)
0 NaNs are propagated; input NaN's give NaN's at the output
FLAG = flag_implicit_skip_nan
gets current mode
flag_implicit_skip_nan(FLAG)
sets mode
prevFLAG = flag_implicit_skip_nan(nextFLAG)
gets previous set FLAG and sets FLAG for the future
flag_implicit_skip_nan(prevFLAG)
resets FLAG to previous mode
It is used in:
SUMSKIPNAN, MEDIAN, QUANTILES, TRIMEAN
and affects many other functions like:
CENTER, KURTOSIS, MAD, MEAN, MOMENT, RMS, SEM, SKEWNESS,
STATISTIC, STD, VAR, ZSCORE etc.
The mode is stored in the global variable FLAG_implicit_skip_nan
It is recommended to use flag_implicit_skip_nan(1) as default and
flag_implicit_skip_nan(0) should be used for exceptional cases only.
This feature might disappear without further notice, so you should really not
rely on it.