1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
################################
##
## Class: GammaParameter
##
################################
## Access Methods
setMethod("shape", "GammaParameter", function(object) object@shape)
setMethod("scale", "GammaParameter",
function(x, center = TRUE, scale = TRUE) x@scale)
### odd arg-list due to existing function in base package
## Replace Methods
setReplaceMethod("shape", "GammaParameter",
function(object, value){ object@shape <- value; object})
setReplaceMethod("scale", "GammaParameter",
function(object, value){ object@scale <- value; object})
validGammaParameter <- 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)
}
setValidity("GammaParameter", validGammaParameter)
################################
##
## Class: gamma distribution
##
################################
Gammad <- function(shape = 1, scale = 1)
new("Gammad", shape = shape, scale = scale)
## wrapped access methods
setMethod("shape", "Gammad", function(object) shape(param(object)))
setMethod("scale", "Gammad",
function(x, center = TRUE, scale = TRUE) scale(param(x)))
### odd arg-list due to existing function in base package
## wrapped replace methods
setMethod("shape<-", "Gammad",
function(object, value)
new("Gammad", shape = value, scale = scale(object)))
setMethod("scale<-", "Gammad",
function(object, value)
new("Gammad", shape = shape(object), scale = value))
|
