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Diffstat (limited to 'packages/hmatrix/examples/inplace.hs')
-rw-r--r-- | packages/hmatrix/examples/inplace.hs | 152 |
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diff --git a/packages/hmatrix/examples/inplace.hs b/packages/hmatrix/examples/inplace.hs deleted file mode 100644 index dcfff56..0000000 --- a/packages/hmatrix/examples/inplace.hs +++ /dev/null | |||
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1 | -- some tests of the interface for pure | ||
2 | -- computations with inplace updates | ||
3 | |||
4 | import Numeric.LinearAlgebra | ||
5 | import Data.Packed.ST | ||
6 | import Data.Packed.Convert | ||
7 | |||
8 | import Data.Array.Unboxed | ||
9 | import Data.Array.ST | ||
10 | import Control.Monad.ST | ||
11 | import Control.Monad | ||
12 | |||
13 | main = sequence_[ | ||
14 | print test1, | ||
15 | print test2, | ||
16 | print test3, | ||
17 | print test4, | ||
18 | test5, | ||
19 | test6, | ||
20 | print test7, | ||
21 | test8, | ||
22 | test0] | ||
23 | |||
24 | -- helper functions | ||
25 | vector l = fromList l :: Vector Double | ||
26 | norm v = pnorm PNorm2 v | ||
27 | |||
28 | -- hmatrix vector and matrix | ||
29 | v = vector [1..10] | ||
30 | m = (5><10) [1..50::Double] | ||
31 | |||
32 | ---------------------------------------------------------------------- | ||
33 | |||
34 | -- vector creation by in-place updates on a copy of the argument | ||
35 | test1 = fun v | ||
36 | |||
37 | fun :: Element t => Vector t -> Vector t | ||
38 | fun x = runSTVector $ do | ||
39 | a <- thawVector x | ||
40 | mapM_ (flip (modifyVector a) (+57)) [0 .. dim x `div` 2 - 1] | ||
41 | return a | ||
42 | |||
43 | -- another example: creation of an antidiagonal matrix from a list | ||
44 | test2 = antiDiag 5 8 [1..] :: Matrix Double | ||
45 | |||
46 | antiDiag :: (Element b) => Int -> Int -> [b] -> Matrix b | ||
47 | antiDiag r c l = runSTMatrix $ do | ||
48 | m <- newMatrix 0 r c | ||
49 | let d = min r c - 1 | ||
50 | sequence_ $ zipWith (\i v -> writeMatrix m i (c-1-i) v) [0..d] l | ||
51 | return m | ||
52 | |||
53 | -- using vector or matrix functions on mutable objects requires freezing: | ||
54 | test3 = g1 v | ||
55 | |||
56 | g1 x = runST $ do | ||
57 | a <- thawVector x | ||
58 | writeVector a (dim x -1) 0 | ||
59 | b <- freezeVector a | ||
60 | return (norm b) | ||
61 | |||
62 | -- another possibility: | ||
63 | test4 = g2 v | ||
64 | |||
65 | g2 x = runST $ do | ||
66 | a <- thawVector x | ||
67 | writeVector a (dim x -1) 0 | ||
68 | t <- liftSTVector norm a | ||
69 | return t | ||
70 | |||
71 | -------------------------------------------------------------- | ||
72 | |||
73 | -- haskell arrays | ||
74 | hv = listArray (0,9) [1..10::Double] | ||
75 | hm = listArray ((0,0),(4,9)) [1..50::Double] | ||
76 | |||
77 | |||
78 | |||
79 | -- conversion from standard Haskell arrays | ||
80 | test5 = do | ||
81 | print $ norm (vectorFromArray hv) | ||
82 | print $ norm v | ||
83 | print $ rcond (matrixFromArray hm) | ||
84 | print $ rcond m | ||
85 | |||
86 | |||
87 | -- conversion to mutable ST arrays | ||
88 | test6 = do | ||
89 | let y = clearColumn m 1 | ||
90 | print y | ||
91 | print (matrixFromArray y) | ||
92 | |||
93 | clearColumn x c = runSTUArray $ do | ||
94 | a <- mArrayFromMatrix x | ||
95 | forM_ [0..rows x-1] $ \i-> | ||
96 | writeArray a (i,c) (0::Double) | ||
97 | return a | ||
98 | |||
99 | -- hmatrix functions applied to mutable ST arrays | ||
100 | test7 = unitary (listArray (1,4) [3,5,7,2] :: UArray Int Double) | ||
101 | |||
102 | unitary v = runSTUArray $ do | ||
103 | a <- thaw v | ||
104 | n <- norm `fmap` vectorFromMArray a | ||
105 | b <- mapArray (/n) a | ||
106 | return b | ||
107 | |||
108 | ------------------------------------------------- | ||
109 | |||
110 | -- (just to check that they are not affected) | ||
111 | test0 = do | ||
112 | print v | ||
113 | print m | ||
114 | --print hv | ||
115 | --print hm | ||
116 | |||
117 | ------------------------------------------------- | ||
118 | |||
119 | histogram n ds = runSTVector $ do | ||
120 | h <- newVector (0::Double) n -- number of bins | ||
121 | let inc k = modifyVector h k (+1) | ||
122 | mapM_ inc ds | ||
123 | return h | ||
124 | |||
125 | -- check that newVector is really called with a fresh new array | ||
126 | histoCheck ds = runSTVector $ do | ||
127 | h <- newVector (0::Double) 15 -- > constant for this test | ||
128 | let inc k = modifyVector h k (+1) | ||
129 | mapM_ inc ds | ||
130 | return h | ||
131 | |||
132 | hc = fromList [1 .. 15::Double] | ||
133 | |||
134 | -- check that thawVector creates a new array | ||
135 | histoCheck2 ds = runSTVector $ do | ||
136 | h <- thawVector hc | ||
137 | let inc k = modifyVector h k (+1) | ||
138 | mapM_ inc ds | ||
139 | return h | ||
140 | |||
141 | test8 = do | ||
142 | let ds = [0..14] | ||
143 | print $ histogram 15 ds | ||
144 | print $ histogram 15 ds | ||
145 | print $ histogram 15 ds | ||
146 | print $ histoCheck ds | ||
147 | print $ histoCheck ds | ||
148 | print $ histoCheck ds | ||
149 | print $ histoCheck2 ds | ||
150 | print $ histoCheck2 ds | ||
151 | print $ histoCheck2 ds | ||
152 | putStrLn "----------------------" | ||