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Calculate Growing Season Degree Days (GSDD) from a vector

Source: R/gsdd-vctr.R
gsdd_vctr.Rd

Calculate Growing Season Degree Days (GSDD) from a vector

Usage

gsdd_vctr(
  x,
  ignore_truncation = FALSE,
  min_length = 274,
  start_temp = 5,
  end_temp = 4,
  window_width = 7,
  pick = "all",
  fun = growth_degdays,
  complete = FALSE,
  msgs = TRUE
)

Arguments

x

A numeric vector of the mean daily water temperature values for the period of interest in C.

ignore_truncation

A flag specifying whether to ignore truncation of the mean daily water temperature vector or a string of "start", "end", "none" (equivalent to FALSE) or "both" (equivalent to TRUE) specifying which type of truncation to ignore.

min_length

A whole number of the minimum length to consider. Must be at least twice the window width but no more than 365. If NULL then set to be the difference between start_date and end_date (ignoring the year).

start_temp

A positive real number of the average water temperature at the start of the growing season(s) in C.

end_temp

A positive real number of the average water temperature at the end of the growing season(s) in C. It must be greater than or equal to the start temperature.

window_width

A positive whole number of the width of the rolling mean window in days. By default 7.

pick

A string specifying whether to pick the "longest", "shortest", "first" or "last" 'season' or the season with the "biggest" or "smallest" GSDD. By default the returned value is the the GSDD value for the "longest" 'season'.

fun

A function that takes a non-zero length double vector of mean daily water temperature values and returns a double vector of the equivalent growth metrics. Must be able to handle 0 values. The growth metrics are summed to give GSDD so if they are multiplicative they should be logged by the functions and then exponentiated upon return.

complete

A flag specifying whether the vector of water temperatures represents the complete possible growing period (by default FALSE). If TRUE a growing season is not considered to be truncated at the start and/or end if the water temperature is above the threshold at the start and/or ends.

msgs

A flag specifying whether to provide messages.

Value

A non-negative real number of the GSDD.

See also

gsdd()

Examples

gsdd_vctr(c(rep(1, 10), rep(10, 20), rep(1, 200)))
#> `The length of `x` must be at least 274.
#> [1] NA
gsdd_vctr(gsdd::temperature_data$temperature)
#> [1] 3898.806