From daily series to monthly and viceversa

Ok, I'll try to explain my issue. I have a monthly series (CPI index) and I
want to interpolate it using a specific lagged harmonized formula to get the
corresponding daily series. The formula is the following
 
CPI^=CPI(t-3)+(d-1)/D*(CPI(t-2)-CPI(t-3))
where

CPI^ is the CPI for the day we are calculating the reference CPI
CPI(t-i) is the CPI for the month i months prior
d is the day of the month for which we are calculating the reference CPI
D is the number of days in the month we are calculating

Then, the interpolation will give me 7 observations a week, but I need only
the observations from Monday to Friday. Therefore, I will have also to
discarde those estimates for Saturdays and Sundays.
Hope you can help. Thanks.

Marco

You can remove missing values with:

zm <- aggregate(cambio, as.yearmon, mean, na.rm = TRUE)

Its not clear what your second question is asking. 

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