Convert a vector containing year, month, day or individual year, month, day arguments into a decimal date in years.
Usage
ddate(year, month, day)
Value
The decimal date in years.
Arguments
year
Either a numeric year OR a vector in the form of c(year, month, day). The latter option is so that ddate() can be conveniently used with apply().
month
If year is a single value, must contain the number of the month.
day
If year is a single value, must contain the number of the day.
Author
Sarah Goslee
Details
ddate() will accept a vector with the three date components so that it can be conveniently used with apply() on a data frame containing columns for year, month and day.