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Side by Side Diff: client/html/benchmarks/common/Math2.dart

Issue 9845043: Rename client/{dom,html} to lib/{dom,html} . (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/
Patch Set: Created 8 years, 9 months ago
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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file.
4
5 // Various math-related utility functions.
6
7 class Math2 {
8 /// Computes the geometric mean of a set of numbers.
9 /// [minNumber] is optional (defaults to 0.001) anything smaller than this
10 /// will be changed to this value, eliminating infinite results.
11 static double geometricMean(Array<double> numbers,
12 [double minNumber = 0.001]) {
13 double log = 0.0;
14 int nNumbers = 0;
15 for (int i = 0, n = numbers.length; i < n; i++) {
16 double number = numbers[i];
17 if (number < minNumber) {
18 number = minNumber;
19 }
20 nNumbers++;
21 log += Math.log(number);
22 }
23
24 return nNumbers > 0 ? Math.pow(Math.E, log / nNumbers) : 0.0;
25 }
26
27 static int round(double d) {
28 return d.round().toInt();
29 }
30
31 static int floor(double d) {
32 return d.floor().toInt();
33 }
34
35 // TODO (olonho): use d.toStringAsFixed(precision) when implemented by DartVM
36 static String toStringAsFixed(num d, int precision) {
37 String dStr = d.toString();
38 int pos = dStr.indexOf('.', 0);
39 int end = pos < 0 ? dStr.length : pos + precision;
40 if (precision > 0) {
41 end++;
42 }
43 if (end > dStr.length) {
44 end = dStr.length;
45 }
46
47 return dStr.substring(0, end);
48 }
49 }
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