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28 lines
792 B
Go
28 lines
792 B
Go
// Copyright ©2016 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 mathext
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import (
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"math"
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"testing"
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)
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func TestDigamma(t *testing.T) {
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for i, test := range []struct {
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x, want float64
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}{
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// Results computed using WolframAlpha.
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{-100.5, 4.615124601338064117341315601525112558522917517910505881343},
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{.5, -1.96351002602142347944097633299875556719315960466043},
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{10, 2.251752589066721107647456163885851537211808918028330369448},
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{math.Pow10(20), 46.05170185988091368035482909368728415202202143924212618733},
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} {
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if got := Digamma(test.x); math.Abs(got-test.want) > 1e-10 {
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t.Errorf("test %d Digamma(%g) failed: got %g want %g", i, test.x, got, test.want)
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}
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}
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}
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