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59 lines
2.1 KiB
Go
59 lines
2.1 KiB
Go
// Copyright ©2014 The gonum Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package distuv
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import (
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"math"
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"testing"
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)
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func TestLaplaceProb(t *testing.T) {
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pts := []univariateProbPoint{
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{
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loc: 0,
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prob: 0.5,
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cumProb: 0.5,
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logProb: math.Log(0.5),
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},
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{
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loc: -1,
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prob: 1 / (2 * math.E),
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cumProb: 0.1839397205857211607977618850807304337229055655158839172539184008487307478724499016785736371729598219,
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logProb: math.Log(1 / (2 * math.E)),
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},
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{
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loc: 1,
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prob: 1 / (2 * math.E),
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cumProb: 0.8160602794142788392022381149192695662770944344841160827460815991512692521275500983214263628270401781,
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logProb: math.Log(1 / (2 * math.E)),
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},
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{
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loc: -7,
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prob: 1 / (2 * math.Pow(math.E, 7)),
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cumProb: 0.0004559409827772581040015680422046413132368622637180269204080667109447399446551532646631395032324502210,
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logProb: math.Log(1 / (2 * math.Pow(math.E, 7))),
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},
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{
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loc: 7,
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prob: 1 / (2 * math.Pow(math.E, 7)),
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cumProb: 0.9995440590172227418959984319577953586867631377362819730795919332890552600553448467353368604967675498,
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logProb: math.Log(1 / (2 * math.Pow(math.E, 7))),
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},
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{
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loc: -20,
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prob: math.Exp(-20.69314718055994530941723212145817656807550013436025525412068000949339362196969471560586332699641869),
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cumProb: 1.030576811219278913982970190077910488187903637799551846486122330814582011892279676639955463952790684 * 1e-9,
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logProb: -20.69314718055994530941723212145817656807550013436025525412068000949339362196969471560586332699641869,
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},
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{
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loc: 20,
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prob: math.Exp(-20.69314718055994530941723212145817656807550013436025525412068000949339362196969471560586332699641869),
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cumProb: 0.999999998969423188780721086017029809922089511812096362200448153513877669185417988107720323360044536,
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logProb: -20.69314718055994530941723212145817656807550013436025525412068000949339362196969471560586332699641869,
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},
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}
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testDistributionProbs(t, Laplace{Mu: 0, Scale: 1}, "Laplace", pts)
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}
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