Extract the season info from a equally spaced time series and create a vector of the season info. For example for monthly data, the function outputs a vector containing the months of the data.
a time series
the user supplied labels for the seasons
The time series must have frequency greater than 1, otherwise the function will stop and issue an error message. If labels is missing, labels will be set as follows: It is set to be c("1Q","2Q","3Q","4Q) if the frequency of x equals 4, c("January",...,"December") if the frequency equals 12, and c("Monday",...,"Sunday") if frequency equals 7. Otherwise, it is set to be c("S1",...)
An invisible vector containing the seasons of the data
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