simulateDriverS {virtualPollen}

Generates drivers for simulatePopulation.

Description

Wrapper of simulateDriver to generate several drivers with different autocorrelation lengths, and return a long format dataframe to be used as input for simulatePopulation. It also produces a plot of the generated drivers. Important: note that the variable time runs from left to right, with lower values representing older samples.

Usage

simulateDriverS(
 random.seeds=c(60, 120),
 time=1:10000,
 autocorrelation.lengths=c(200, 600),
 output.min=c(0,0),
 output.max=c(100, 100),
 driver.names=c("A", "B"),
 filename=NULL)

Arguments

random.seeds

vector of integers, seeds to be used by set.seed.

time

integer, or numeric vector of integers with constant intervals. If a single integer is provided, a time sequence is generated from 0 to the given integer as seq(0, time, by = 1). Default is 1:10000.

autocorrelation.lengths

vector of integers, represents the lengths of the convolution filters to be used to impose a particular temporal structure on each driver. Default is 100, equivalent to a filter composed by a hundred of ones.

output.min

numeric vector, minimum values of the output time series. Used as input for rescaleVector. Default is 0.

output.max

numeric vector, maximum values of the output time series. Used as input for rescaleVector. Default is 100.

driver.names

character vector, with labels to be used to identify the drivers.

filename

character string, name of output pdf file. If NULL or empty, no pdf is produced.

Details

It is recommended to use time vectors with a time step of 1 between consecutive values when the output is to be used as input for simulatePopulation, which considers annual time-steps while simulating virtual pollen curves. Initial random sequence is generated by rnorm. Desired temporal autocorrelation are approximate, but deviation becomes higher if autocorrelation.length is larger than half the length of time. Consequently, the function limits autocorrelation.length to length(time)/2.

Value

A long format dataframe (see dataset drivers) with the following columns:

• time: integer.

• driver: character, values are A and B

• autocorrelation.length: numeric, default values are 200, 600, and 1800.

• value: numeric, value of the driver for the given time.

Author(s)

Blas M. Benito <[e-mail]>

See Also

drivers, simulateDriver, simulatePopulation, drivers

Examples

drivers <- simulateDriverS(
 random.seeds=c(60, 120),
 time=1:10000,
 autocorrelation.lengths=c(200, 600),
 output.min=c(0,0),
 output.max=c(100, 100),
 driver.names=c("A", "B"),
 filename=NULL
)

str(drivers)