Biogeme: Python Library  4.6a
legendre.py
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1 
3 from math import sqrt
4 
5 
9 def legendre00(x):
10  return 1
11 
12 
16 def legendre01(x):
17  return sqrt(3.0) * (2 * x - 1)
18 
19 
23 def legendre02(x):
24  return sqrt(5.0) * (6 * x * x - 6 * x + 1)
25 
26 
30 def legendre03(x):
31  return sqrt(7.0) * (20 * x * x * x - 30 * x * x + 12 * x - 1)
32 
33 
37 def legendre04(x):
38  i = 4
39  t1 = sqrt(4 * i * i - 1) / i
40  t2 = (i-1)*sqrt(2*i+1)/(i*sqrt(2*i-3))
41  return t1 * (2*x-1) * legendre03(x) - t2 * legendre02(x)
42 
43 
47 def legendre05(x):
48  i = 5
49  t1 = sqrt(4 * i * i - 1) / i
50  t2 = (i-1)*sqrt(2*i+1)/(i*sqrt(2*i-3))
51  return t1 * (2*x-1) * legendre04(x) - t2 * legendre03(x)
52 
53 
57 def legendre06(x):
58  i = 6
59  t1 = sqrt(4 * i * i - 1) / i
60  t2 = (i-1)*sqrt(2*i+1)/(i*sqrt(2*i-3))
61  return t1 * (2*x-1) * legendre05(x) - t2 * legendre04(x)
62 
63 
67 def legendre07(x):
68  i = 7
69  t1 = sqrt(4 * i * i - 1) / i
70  t2 = (i-1)*sqrt(2*i+1)/(i*sqrt(2*i-3))
71  return t1 * (2*x-1) * legendre06(x) - t2 * legendre05(x)
72 
def legendre04(x)
Implements the transformed Legendre polynomials of degree 4.
Definition: legendre.py:37
def legendre00(x)
Implements the transformed Legendre polynomials of degree 0 .
Definition: legendre.py:9
def legendre06(x)
Implements the transformed Legendre polynomials of degree 6.
Definition: legendre.py:57
def legendre01(x)
Implements the transformed Legendre polynomials of degree 1 .
Definition: legendre.py:16
def legendre02(x)
Implements the transformed Legendre polynomials of degree 2 .
Definition: legendre.py:23
def legendre05(x)
Implements the transformed Legendre polynomials of degree 5.
Definition: legendre.py:47
def legendre03(x)
Implements the transformed Legendre polynomials of degree 3 .
Definition: legendre.py:30
def legendre07(x)
Implements the transformed Legendre polynomials of degree 7.
Definition: legendre.py:67
Copyright 2017 Michel Bierlaire