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LSST Data Management Base Package
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generator.py
Go to the documentation of this file.
1from ._shapeletLib import HERMITE, LAGUERRE, computeSize
2
3__all__ = ['IndexGenerator', 'HermiteIndexGenerator', 'LaguerreIndexGenerator']
4
5
7 """Base class for shapelet index generators.
8
9 Parameters
10 ----------
11 order: `int`
12 Order of the function indices to generate.
13 """
14
15 __slots__ = "order", "size"
16
17 def __init__(self, order):
18 self.order = order
19 self.size = computeSize(self.order)
20
21 @staticmethod
22 def make(self, order, basisType):
23 if basisType == HERMITE:
24 return HermiteIndexGenerator(order)
25 elif basisType == LAGUERRE:
26 return LaguerreIndexGenerator(order)
27
28 def __len__(self):
29 return self.size
30
31
33 """Iterable that generates tuples of indices.
34
35 Yields
36 ------
37 i : `int`
38 the overall coefficient index for a 2-d shapelet expansion (just counts from zero)
39 nx : `int`
40 the order of the x expansion
41 ny : `int`
42 the order of the y expansion
43 """
44
45 def __iter__(self):
46 i = 0
47 for n in range(0, self.order+1):
48 for nx in range(0, n+1):
49 yield (i, nx, n - nx)
50 i += 1
51
52
54 """Iterable that generates tuples of indices.
55
56 Yields
57 ------
58 i : `int`
59 the overall coefficient index for a 2-d shapelet expansion (just counts from zero)
60 p, q : `int`
61 indices of the polar shapelet expansion (see BasisTypeEnum).
62 re : `bool`
63 True, if this is the real part of the coefficient.
64 """
65
66 def __iter__(self):
67 i = 0
68 for n in range(0, self.order+1):
69 p = n
70 q = 0
71 while p > q:
72 yield (i, p, q, True)
73 i += 1
74 yield (i, p, q, False)
75 i += 1
76 p -= 1
77 q += 1
78 if p == q:
79 yield (i, p, q, True)
80 i += 1
int computeSize(int order)
Return the size of the coefficient vector for the given order.
Definition constants.h:97