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Diffstat (limited to 'packages/base/src/Numeric/LinearAlgebra/Random.hs')
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diff --git a/packages/base/src/Numeric/LinearAlgebra/Random.hs b/packages/base/src/Numeric/LinearAlgebra/Random.hs deleted file mode 100644 index b66988e..0000000 --- a/packages/base/src/Numeric/LinearAlgebra/Random.hs +++ /dev/null | |||
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1 | ----------------------------------------------------------------------------- | ||
2 | -- | | ||
3 | -- Module : Numeric.LinearAlgebra.Random | ||
4 | -- Copyright : (c) Alberto Ruiz 2009-14 | ||
5 | -- License : BSD3 | ||
6 | -- Maintainer : Alberto Ruiz | ||
7 | -- Stability : provisional | ||
8 | -- | ||
9 | -- Random vectors and matrices. | ||
10 | -- | ||
11 | ----------------------------------------------------------------------------- | ||
12 | |||
13 | module Numeric.LinearAlgebra.Random ( | ||
14 | Seed, | ||
15 | RandDist(..), | ||
16 | randomVector, | ||
17 | gaussianSample, | ||
18 | uniformSample, | ||
19 | rand, randn | ||
20 | ) where | ||
21 | |||
22 | import Numeric.Vectorized | ||
23 | import Data.Packed | ||
24 | import Data.Packed.Internal.Numeric | ||
25 | import Numeric.LinearAlgebra.Algorithms | ||
26 | import System.Random(randomIO) | ||
27 | |||
28 | |||
29 | -- | Obtains a matrix whose rows are pseudorandom samples from a multivariate | ||
30 | -- Gaussian distribution. | ||
31 | gaussianSample :: Seed | ||
32 | -> Int -- ^ number of rows | ||
33 | -> Vector Double -- ^ mean vector | ||
34 | -> Matrix Double -- ^ covariance matrix | ||
35 | -> Matrix Double -- ^ result | ||
36 | gaussianSample seed n med cov = m where | ||
37 | c = dim med | ||
38 | meds = konst' 1 n `outer` med | ||
39 | rs = reshape c $ randomVector seed Gaussian (c * n) | ||
40 | m = rs `mXm` cholSH cov `add` meds | ||
41 | |||
42 | -- | Obtains a matrix whose rows are pseudorandom samples from a multivariate | ||
43 | -- uniform distribution. | ||
44 | uniformSample :: Seed | ||
45 | -> Int -- ^ number of rows | ||
46 | -> [(Double,Double)] -- ^ ranges for each column | ||
47 | -> Matrix Double -- ^ result | ||
48 | uniformSample seed n rgs = m where | ||
49 | (as,bs) = unzip rgs | ||
50 | a = fromList as | ||
51 | cs = zipWith subtract as bs | ||
52 | d = dim a | ||
53 | dat = toRows $ reshape n $ randomVector seed Uniform (n*d) | ||
54 | am = konst' 1 n `outer` a | ||
55 | m = fromColumns (zipWith scale cs dat) `add` am | ||
56 | |||
57 | -- | pseudorandom matrix with uniform elements between 0 and 1 | ||
58 | randm :: RandDist | ||
59 | -> Int -- ^ rows | ||
60 | -> Int -- ^ columns | ||
61 | -> IO (Matrix Double) | ||
62 | randm d r c = do | ||
63 | seed <- randomIO | ||
64 | return (reshape c $ randomVector seed d (r*c)) | ||
65 | |||
66 | -- | pseudorandom matrix with uniform elements between 0 and 1 | ||
67 | rand :: Int -> Int -> IO (Matrix Double) | ||
68 | rand = randm Uniform | ||
69 | |||
70 | {- | pseudorandom matrix with normal elements | ||
71 | |||
72 | >>> disp 3 =<< randn 3 5 | ||
73 | 3x5 | ||
74 | 0.386 -1.141 0.491 -0.510 1.512 | ||
75 | 0.069 -0.919 1.022 -0.181 0.745 | ||
76 | 0.313 -0.670 -0.097 -1.575 -0.583 | ||
77 | |||
78 | -} | ||
79 | randn :: Int -> Int -> IO (Matrix Double) | ||
80 | randn = randm Gaussian | ||
81 | |||