This function creates an additional date in the data set to make a full annual cycle
Arguments
- df
a data.frame of long format returned from
convert_length_to_mass()function- envData
(optional) a data.frame of the environmental data. The number of rows should be the same as the number of sampling dates.
- dateCol
character string identifying the column name of the sampling dates
- wrapDate
logical. should we wrap the dates to make full year?