frostProb: First day in the year where P(tmin<0) <= prob
In rsnotivoli/agroclim: Climatic Indices for Agriculture

Description Usage Arguments Details Value Examples

Calculates the first day in the year where the probability if frost is under a threshold.

1 2	frostProb(mn, dates, iniday = "07-01", endday = "06-30", type = "doy", thres = 0, prob = 0.1)

`mn`	vector of daily minimum temperature series.
`dates`	vector of dates corresponding with daily temprature series
`iniday`	first day of the year ("dd-mm") when frost occurrence will be considered.
`endday`	last day of the year ("dd-mm") when frost occurrence will be considered.
`type`	type of output. It can be "doy" for day of the year (julian day) or "date" for data format ("dd-mm").
`thres`	temperature threshold considered to trigger frost occurrence (0 by default).
`prob`	numeric. Threshold indicating the probability (0.10 by default)

The function is able to span over years. If the argument "enddate" is a date earlier than "inidate", the considered period will cover from "inidate" to the end of the year and from the beginning of the next year to "enddate".#' @return depending on argument type, the output will be a numeric vector of julian days (type = "doy") or a vector of characters with dates (type = "date").

A numeric vector with the annual number of frost probability is returned.

frostProb(mn = daily_tmin,
  dates = seq.Date(as.Date('1981-01-01'),
                             as.Date('2010-12-31'), by ='day'),
  iniday = '07-01',
  endday = '06-30',
  type = 'date',
  prob = 0.10)