29 lines
716 B
PHP
29 lines
716 B
PHP
<?php
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declare(strict_types=1);
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namespace Phpml\Tests\Math\Statistic;
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use Phpml\Math\Statistic\Gaussian;
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use PHPUnit\Framework\TestCase;
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class GaussianTest extends TestCase
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{
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public function testPdf(): void
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{
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$std = 1.0;
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$mean = 0.0;
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$g = new Gaussian($mean, $std);
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// Allowable error
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$delta = 0.001;
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$x = [0, 0.1, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0];
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$pdf = [0.3989, 0.3969, 0.3520, 0.2419, 0.1295, 0.0539, 0.0175, 0.0044];
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foreach ($x as $i => $v) {
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self::assertEqualsWithDelta($pdf[$i], $g->pdf($v), $delta);
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self::assertEqualsWithDelta($pdf[$i], Gaussian::distributionPdf($mean, $std, $v), $delta);
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}
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}
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}
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