Normalize Year-Period Array
This function normalizes a numerical array c(YEAR,PERIOD), given a frequency f and PERIOD>=f.
 e.g. normalizeYP(c(2000,15),12) = c(2001,3)
normalizeYP(x = NULL, f = NULL)
| x | Input numerical array  | 
| f | Frequency of normalization. Must be a positive integer. | 
This function returns a numerical array c(YEAR,PERIOD)
#c(2,13) and frequency=4 => c(5,1) print(normalizeYP(c(2,13),4))
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