######################################################################################################################
# Function: ExpoDist.
# Argument: List of parameters (number of observations, rate).
# Description: This function is used to generate exponential outcomes.
ExpoDist = function(parameter) {
# Error checks
if (missing(parameter))
stop("Data model: ExpoDist distribution: List of parameters must be provided.")
if (is.null(parameter[[2]]$rate))
stop("Data model: ExpoDist distribution: Rate parameter must be specified.")
rate = parameter[[2]]$rate
# Parameters check
if (rate <= 0) stop("Data model: ExpoDist distribution: Rate parameter must be positive")
# Determine the function call, either to generate distribution or to return description
call = (parameter[[1]] == "description")
# Generate random variables
if (call == FALSE) {
n = parameter[[1]]
if (n%%1 != 0)
stop("Data model: ExpoDist distribution: Number of observations must be an integer.")
if (n <= 0)
stop("Data model: ExpoDist distribution: Number of observations must be positive.")
result = stats::rexp(n = n, rate = rate)
} else {
# Provide information about the distribution function
if (call == TRUE) {
# Labels of distributional parameters
result = list(list(rate = "rate"),list("Exponential"))
}
}
return(result)
}
# End of ExpoDist
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