Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(238)

Side by Side Diff: samples/third_party/dromaeo/common/Math2.dart

Issue 11748016: Make ~/, round, ceil, floor, truncate return ints. Remove toInt. (Closed) Base URL: https://dart.googlecode.com/svn/experimental/lib_v2/dart
Patch Set: Checked mode fixes. Created 7 years, 11 months ago
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View unified diff | Download patch | Annotate | Revision Log
OLDNEW
1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file 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 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. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 part of common; 5 part of common;
6 6
7 // Various math-related utility functions. 7 // Various math-related utility functions.
8 8
9 class Math2 { 9 class Math2 {
10 /// Computes the geometric mean of a set of numbers. 10 /// Computes the geometric mean of a set of numbers.
11 /// [minNumber] is optional (defaults to 0.001) anything smaller than this 11 /// [minNumber] is optional (defaults to 0.001) anything smaller than this
12 /// will be changed to this value, eliminating infinite results. 12 /// will be changed to this value, eliminating infinite results.
13 static double geometricMean(List<double> numbers, 13 static double geometricMean(List<double> numbers,
14 [double minNumber = 0.001]) { 14 [double minNumber = 0.001]) {
15 double log = 0.0; 15 double log = 0.0;
16 int nNumbers = 0; 16 int nNumbers = 0;
17 for (int i = 0, n = numbers.length; i < n; i++) { 17 for (int i = 0, n = numbers.length; i < n; i++) {
18 double number = numbers[i]; 18 double number = numbers[i];
19 if (number < minNumber) { 19 if (number < minNumber) {
20 number = minNumber; 20 number = minNumber;
21 } 21 }
22 nNumbers++; 22 nNumbers++;
23 log += Math.log(number); 23 log += Math.log(number);
24 } 24 }
25 25
26 return nNumbers > 0 ? Math.pow(Math.E, log / nNumbers) : 0.0; 26 return nNumbers > 0 ? Math.pow(Math.E, log / nNumbers) : 0.0;
27 } 27 }
28 28
29 static int round(double d) { 29 static int round(double d) {
30 return d.round().toInt(); 30 return d.round();
31 } 31 }
32 32
33 static int floor(double d) { 33 static int floor(double d) {
34 return d.floor().toInt(); 34 return d.floor();
35 } 35 }
36 36
37 // TODO (olonho): use d.toStringAsFixed(precision) when implemented by DartVM 37 // TODO (olonho): use d.toStringAsFixed(precision) when implemented by DartVM
38 static String toStringAsFixed(num d, int precision) { 38 static String toStringAsFixed(num d, int precision) {
39 String dStr = d.toString(); 39 String dStr = d.toString();
40 int pos = dStr.indexOf('.', 0); 40 int pos = dStr.indexOf('.', 0);
41 int end = pos < 0 ? dStr.length : pos + precision; 41 int end = pos < 0 ? dStr.length : pos + precision;
42 if (precision > 0) { 42 if (precision > 0) {
43 end++; 43 end++;
44 } 44 }
45 if (end > dStr.length) { 45 if (end > dStr.length) {
46 end = dStr.length; 46 end = dStr.length;
47 } 47 }
48 48
49 return dStr.substring(0, end); 49 return dStr.substring(0, end);
50 } 50 }
51 } 51 }
OLDNEW

Powered by Google App Engine
This is Rietveld 408576698