x to class
"yearmon". If duplicate months are
x. Otherwise, return the conversion with names =
object suitable for
additional argument(s) (e.g., a format) passed to
Dates for some monthly data include the day of the month on which the
data were published. For many purposes, one would like to have the
data as a
zoo object with a
yearmon index, while still
retaining the full date for other purposes.
yearmon form of the input is not uniqe,
as.yearmon2 returns the input unchanged with a warning.
Otherwise, it returns the
yearmon conversion with the input as
Returns either its argument or its argument converted to class
yearmon with names.
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