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################################
##
## Class: WeibullParameter
##
################################
## Access Methods
setMethod("shape", "WeibullParameter",
function(object) object@shape)
setMethod("scale", "WeibullParameter",
function(x, center = TRUE, scale = TRUE) x@scale)
### odd arg-list due to existing function in base package
## Replace Methods
setReplaceMethod("shape", "WeibullParameter",
function(object, value){ object@shape <- value; object})
setReplaceMethod("scale", "WeibullParameter",
function(object, value){ object@scale <- value; object})
setValidity("WeibullParameter", function(object){
if(length(shape(object)) != 1)
stop("shape has to be a numeric of length 1")
if(shape(object) <= 0)
stop("shape has to be positive")
if(length(scale(object)) != 1)
stop("scale has to be a numeric of length 1")
if(scale(object) <= 0)
stop("scale has to be positive")
else return(TRUE)
})
################################
##
## Class: Weibull distribution
##
################################
Weibull <- function(shape = 1, scale = 1)
new("Weibull", shape = shape, scale = scale)
## wrapped access methods
setMethod("shape", "Weibull",
function(object) shape(param(object)))
setMethod("scale", "Weibull",
function(x, center = TRUE, scale = TRUE) scale(param(x)))
### odd arg-list due to existing function in base package
## wrapped replace methods
setMethod("shape<-", "Weibull",
function(object, value)
new("Weibull", shape = value, scale = scale(object)))
setMethod("scale<-", "Weibull",
function(object, value)
new("Weibull", shape = shape(object), scale = value))
setMethod("*", c("Weibull","numeric"),
function(e1, e2){
if(isTRUE(all.equal(e2,0)))
return(new("Dirac", location = 0, .withArith = TRUE))
if(e2 > 0)
return(new("Weibull", shape = shape(e1),
scale = scale(e1) * e2, .withArith = TRUE))
return(-1 * as(Weibull(shape = shape(e1),
scale = scale(e1) * (-e2)),
"AbscontDistribution")
)
})
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