growthPheno (version 2.1.21)

intervalWUI: Calculates water use indices (WUI) over a specified time interval to a data.frame

Description

Calculates the Water Use Index (WUI) between two time points for a set of responses.

Note: this function is soft deprecated and may be removed in future versions.
Use byIndv4Intvl_WaterUse.

Usage

intervalWUI(responses, water.use = "Water.Use", 
            individuals = "Snapshot.ID.Tag", times = "Days", 
            start.time, end.time, suffix.interval = NULL, 
            data, include.total.water = FALSE, na.rm = FALSE)

Value

A data.frame containing the WUIs, the name of each column being the concatenation of one of responses,

WUI and, if not NULL, suffix.interval, the three components being separated by a full stop. If the total water is to be included, the name of the column will be the concatenation of

water.use, Total and the suffix, each separated by a full stop(`.').

Arguments

responses

A character giving the names of the columns in data from which the growth rates are to be calculated.

water.use

A character giving the names of the column in data which contains the water use values.

individuals

A character giving the name of the factor that defines the subsets of the data for which each subset corresponds to the response values for an individual (e.g. plant, pot, cart, plot or unit).

times

A character giving the name of the column in data containing the times at which the data was collected, either as a numeric, factor, or character. It will be used identifying the intervals and, if a factor or character, the values should be numerics stored as characters.

start.time

A numeric giving the times, in terms of values in times, that will give a single value for each Snapshot.ID.Tag and that will be taken as the observation at the start of the interval for which the WUI is to be calculated.

end.time

A numeric giving the times, in terms of values times, that will give a single value for each Snapshot.ID.Tag and that will be taken as the observation at the end of the interval for which the WUI is to be calculated.

suffix.interval

A character giving the suffix to be appended to response to form the names of the columns containing the calculated the growth rates.

data

A data.frame containing the column from which the growth rates are to be calculated.

include.total.water

A logical indicating whether or not to include a column in the results for the total of water.use for the interval for each individual.

na.rm

A logical indicating whether NA values should be stripped before the calculation proceeds.

Author

Chris Brien

Details

The WUI is calculated as the difference between the values of a response at the end.time and start.time divided by the sum of the water use after start.time until end.time. Thus, the water use up to start.time is not included.

See Also

intervalGRaverage, intervalGRdiff, splitValueCalculate, getTimesSubset, GrowthRates

Examples

data(exampleData)
PSA.WUI <- intervalWUI(response = "PSA", water.use = "WU", 
                       times = "DAP", start.time = 31, end.time = 35, 
                       suffix = "31to35", 
                       data = longi.dat, include.total.water = TRUE)