Mercurial > hg > truffle
annotate src/share/vm/utilities/numberSeq.hpp @ 4530:6c6cb7be1324
bugfix
author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Wed, 08 Feb 2012 21:13:35 -0800 |
parents | f95d63e2154a |
children | 2c0751569716 |
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342 | 1 /* |
1972 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_UTILITIES_NUMBERSEQ_HPP |
26 #define SHARE_VM_UTILITIES_NUMBERSEQ_HPP | |
27 | |
342 | 28 /** |
29 ** This file contains a few classes that represent number sequence, | |
30 ** x1, x2, x3, ..., xN, and can calculate their avg, max, and sd. | |
31 ** | |
32 ** Here's a quick description of the classes: | |
33 ** | |
34 ** AbsSeq: abstract superclass | |
35 ** NumberSeq: the sequence is assumed to be very long and the | |
36 ** maximum, avg, sd, davg, and dsd are calculated over all its elements | |
37 ** TruncatedSeq: this class keeps track of the last L elements | |
38 ** of the sequence and calculates avg, max, and sd only over them | |
39 **/ | |
40 | |
41 #define DEFAULT_ALPHA_VALUE 0.7 | |
42 | |
43 class AbsSeq { | |
44 private: | |
45 void init(double alpha); | |
46 | |
47 protected: | |
48 int _num; // the number of elements in the sequence | |
49 double _sum; // the sum of the elements in the sequence | |
50 double _sum_of_squares; // the sum of squares of the elements in the sequence | |
51 | |
52 double _davg; // decaying average | |
53 double _dvariance; // decaying variance | |
54 double _alpha; // factor for the decaying average / variance | |
55 | |
56 // This is what we divide with to get the average. In a standard | |
57 // number sequence, this should just be the number of elements in it. | |
58 virtual double total() const { return (double) _num; }; | |
59 | |
60 public: | |
61 AbsSeq(double alpha = DEFAULT_ALPHA_VALUE); | |
62 | |
63 virtual void add(double val); // adds a new element to the sequence | |
64 void add(unsigned val) { add((double) val); } | |
65 virtual double maximum() const = 0; // maximum element in the sequence | |
66 virtual double last() const = 0; // last element added in the sequence | |
67 | |
68 // the number of elements in the sequence | |
69 int num() const { return _num; } | |
70 // the sum of the elements in the sequence | |
71 double sum() const { return _sum; } | |
72 | |
73 double avg() const; // the average of the sequence | |
74 double variance() const; // the variance of the sequence | |
75 double sd() const; // the standard deviation of the sequence | |
76 | |
77 double davg() const; // decaying average | |
78 double dvariance() const; // decaying variance | |
79 double dsd() const; // decaying "standard deviation" | |
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80 |
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81 // Debugging/Printing |
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82 virtual void dump(); |
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83 virtual void dump_on(outputStream* s); |
342 | 84 }; |
85 | |
86 class NumberSeq: public AbsSeq { | |
87 private: | |
88 bool check_nums(NumberSeq* total, int n, NumberSeq** parts); | |
89 | |
90 protected: | |
91 double _last; | |
92 double _maximum; // keep track of maximum value | |
93 | |
94 public: | |
95 NumberSeq(double alpha = DEFAULT_ALPHA_VALUE); | |
96 NumberSeq(NumberSeq* total, int n_parts, NumberSeq** parts); | |
97 | |
98 virtual void add(double val); | |
99 virtual double maximum() const { return _maximum; } | |
100 virtual double last() const { return _last; } | |
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101 |
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102 // Debugging/Printing |
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103 virtual void dump_on(outputStream* s); |
342 | 104 }; |
105 | |
106 class TruncatedSeq: public AbsSeq { | |
107 private: | |
108 enum PrivateConstants { | |
109 DefaultSeqLength = 10 | |
110 }; | |
111 void init(); | |
112 protected: | |
113 double *_sequence; // buffers the last L elements in the sequence | |
114 int _length; // this is L | |
115 int _next; // oldest slot in the array, i.e. next to be overwritten | |
116 | |
117 public: | |
118 // accepts a value for L | |
119 TruncatedSeq(int length = DefaultSeqLength, | |
120 double alpha = DEFAULT_ALPHA_VALUE); | |
121 virtual void add(double val); | |
122 virtual double maximum() const; | |
123 virtual double last() const; // the last value added to the sequence | |
124 | |
125 double oldest() const; // the oldest valid value in the sequence | |
126 double predict_next() const; // prediction based on linear regression | |
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127 |
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128 // Debugging/Printing |
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129 virtual void dump_on(outputStream* s); |
342 | 130 }; |
1972 | 131 |
132 #endif // SHARE_VM_UTILITIES_NUMBERSEQ_HPP |