Mercurial > gemma

annotate pkg/common/nashsutcliffe.go @ 3678:8f58851927c0

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client: make layer factory only return new layer config for individual maps instead of each time it is invoked. The purpose of the factory was to support multiple maps with individual layers. But returning a new config each time it is invoked leads to bugs that rely on the layer's state. Now this factory reuses the same objects it created before, per map.
author Markus Kottlaender <markus@intevation.de>
date Mon, 17 Jun 2019 17:31:35 +0200
parents 247e78ba2bf7
children 8c5df0f3562e
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2019 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13
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14 package common
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15
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16 import (
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17 "fmt"
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18 "time"
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19 )
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20
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21 type TimedValue struct {
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22 When time.Time
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23 Value float64
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24 }
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25
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26 type TimedValues []TimedValue
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27
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28 func epsEquals(a, b time.Time) bool {
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29 d := a.Sub(b)
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30 return -10*time.Millisecond < d && d < 10*time.Millisecond
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31 }
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32
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33 func (mvs TimedValues) Find(when time.Time) (float64, bool) {
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34 for i := range mvs {
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35 if epsEquals(when, mvs[i].When) {
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36 return mvs[i].Value, true
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37 }
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38 }
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39 return 0, false
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40 }
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41
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42 func NashSutcliffe(predicted, observed []float64) float64 {
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43
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44 if len(predicted) != len(observed) {
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45 panic(fmt.Sprintf(
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46 "NashSutcliffe: predicted and observed len differ: %d != %d",
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47 len(predicted),
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48 len(observed)))
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49 }
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50
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51 if len(observed) == 0 {
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52 return 0
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53 }
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54
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55 var mo float64
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56 for _, v := range observed {
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57 mo += v
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58 }
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59
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60 mo /= float64(len(observed))
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61
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62 var num, denom float64
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63 for i, o := range observed {
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64 d1 := predicted[i] - o
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65 num += d1 * d1
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66 d2 := o - mo
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67 denom += d2 * d2
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68 }
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69
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70 return 1 - num/denom
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71 }