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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
-- urn class: random selection without repetitions.
-- fbar 2007
-- urn interface:
local urn = {}
function urn.new(size)
assert(size > 0, "Error: size of urn must be greater than 0")
local t = {size=size, last=size}
for i=1,size do
t[i] = i
end
return t
end
function urn.get(u)
if u.last > 0 then
local i = math.random(u.last)
local res = u[i]
u[i] = u[u.last]
u.last = u.last - 1
return res
else
return nil
end
end
function urn.reset(u)
u.last = u.size
for i=1,u.size do
u[i] = i
end
end
-- Pd class:
local M = pd.Class:new():register("lurn")
function M:initialize(name, atoms)
if type(atoms[1]) == "number" and atoms[1] >= 1 then
self.u = urn.new(math.floor(math.max(atoms[1]), 1))
else
self.u = urn.new(1)
end
self.inlets = 2
self.outlets = 2
return true
end
function M:finalize()
self.u = nil
end
function M:in_2_float(f)
if f >= 1 then
self.u = urn.new(math.floor(f))
else
self:error("size of urn too small. needs to be 1 at least")
end
end
function M:in_1_clear(atoms)
urn.reset(self.u)
end
function M:in_1_seed(atoms)
if type(atoms[1]) == "number" then
math.randomseed(atoms[1])
else
self:error("seed needs a number")
end
end
function M:in_1_bang()
local f = urn.get(self.u)
if type(f) == "number" then
self:outlet(1, "float", {f - 1})
else
self:outlet(2, "bang", {})
end
end
|
