Checks if a date/time vector is regular
Checks if a date/time vector is regular. i.e. if it is a daily, a monthly, or a quarterly date/time vector. If the date/time vector is regular the frequency can determined calling the function frequency.
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an R object of class
arguments to be passed
A date/time vector is defined as daily if the vector has not more than one date/time stamp per day.
A date/time vector is defined as monthly if the vector has not more than one date/time stamp per month.
A date/time vector is defined as quarterly if the vector has not more than one date/time stamp per quarter.
A monthly date/time vector is also a daily vector, a quarterly date/time vector is also a monthly vector.
A regular date/time vector is either a monthly or a quarterly vector.
NOT yet implemented is the case of weekly vectors.
is* functions return
on whether the date/time vector fulfills the condition or not.
The function frequency returns in general 1, for quarterly date/time vectors 4, and for monthly vectors 12.
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