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| 1 <!DOCTYPE html> | 1 <!DOCTYPE html> |
| 2 <!-- | 2 <!-- |
| 3 Copyright (c) 2015 The Chromium Authors. All rights reserved. | 3 Copyright (c) 2015 The Chromium Authors. All rights reserved. |
| 4 Use of this source code is governed by a BSD-style license that can be | 4 Use of this source code is governed by a BSD-style license that can be |
| 5 found in the LICENSE file. | 5 found in the LICENSE file. |
| 6 --> | 6 --> |
| 7 <link rel="import" href="/tracing/model/user_model/user_expectation.html"> | 7 <link rel="import" href="/tracing/model/user_model/user_expectation.html"> |
| 8 | 8 |
| 9 <script> | 9 <script> |
| 10 'use strict'; | 10 'use strict'; |
| 11 | 11 |
| 12 tr.exportTo('tr.metrics.sh', function() { | 12 tr.exportTo('tr.metrics.sh', function() { |
| 13 // Returns a weight for this score. | 13 // Returns a weight for this score. |
| 14 // score should be a number between 0 and 1 inclusive. | 14 // score should be a number between 0 and 1 inclusive. |
| 15 // This function is expected to be passed to tr.b.Statistics.weightedMean as | 15 // This function is expected to be passed to tr.b.math.Statistics.weightedMean |
| 16 // its weightCallback. | 16 // as its weightCallback. |
| 17 function perceptualBlend(ir, index, score) { | 17 function perceptualBlend(ir, index, score) { |
| 18 // Lower scores are exponentially more important than higher scores | 18 // Lower scores are exponentially more important than higher scores |
| 19 // due to the Peak-end rule. | 19 // due to the Peak-end rule. |
| 20 // Other than that general rule, there is no specific reasoning behind this | 20 // Other than that general rule, there is no specific reasoning behind this |
| 21 // specific formula -- it is fairly arbitrary. | 21 // specific formula -- it is fairly arbitrary. |
| 22 return Math.exp(1 - score); | 22 return Math.exp(1 - score); |
| 23 } | 23 } |
| 24 | 24 |
| 25 function filterExpectationsByRange(irs, opt_range) { | 25 function filterExpectationsByRange(irs, opt_range) { |
| 26 var filteredExpectations = []; | 26 var filteredExpectations = []; |
| 27 irs.forEach(function(ir) { | 27 irs.forEach(function(ir) { |
| 28 if (!(ir instanceof tr.model.um.UserExpectation)) | 28 if (!(ir instanceof tr.model.um.UserExpectation)) |
| 29 return; | 29 return; |
| 30 | 30 |
| 31 if (!opt_range || | 31 if (!opt_range || |
| 32 opt_range.intersectsExplicitRangeInclusive(ir.start, ir.end)) | 32 opt_range.intersectsExplicitRangeInclusive(ir.start, ir.end)) |
| 33 filteredExpectations.push(ir); | 33 filteredExpectations.push(ir); |
| 34 }); | 34 }); |
| 35 return filteredExpectations; | 35 return filteredExpectations; |
| 36 } | 36 } |
| 37 | 37 |
| 38 return { | 38 return { |
| 39 perceptualBlend, | 39 perceptualBlend, |
| 40 filterExpectationsByRange, | 40 filterExpectationsByRange, |
| 41 }; | 41 }; |
| 42 }); | 42 }); |
| 43 </script> | 43 </script> |
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Chromium Code Reviews
Issue 2771723003:
[tracing] Move math utilities from base into their own subdirectory (attempt 2) (Closed)
