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More Tests for Logarithmic and Power Trends

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This commit is contained in:
oleibman
2025-12-12 09:28:49 -08:00
parent 73138133cf
commit 6cb44f2a63
1 changed files with 8 additions and 0 deletions
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tests/PhpSpreadsheetTests/Shared/Trend/BestFitTest.php
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@@ -45,6 +45,10 @@ class BestFitTest extends TestCase
$maxType = $type;
}
self::assertEqualsWithDelta(-0.0724, $goodness, self::LBF_PRECISION);
self::assertEqualsWithDelta(0.3116, $result->getValueOfXForY(2.1), self::LBF_PRECISION);
$equation = $result->getEquation();
$match = preg_match('/^Y = 0[.]01765\d+ [*] log[(]2.1205\d+ [*] X[)]$/', $equation);
self::assertSame(1, $match, $equation);
$type = Trend::TREND_POWER;
$result = Trend::calculate($type, $yValues, $xValues);
@@ -54,6 +58,10 @@ class BestFitTest extends TestCase
$maxType = $type;
}
self::assertEqualsWithDelta(0.9946, $goodness, self::LBF_PRECISION);
self::assertEqualsWithDelta(28.0886, $result->getValueOfXForY(10.0), self::LBF_PRECISION);
$equation = $result->getEquation();
$match = preg_match('/^Y = 0[.]1705\d+ [*] X\^1[.]2207\d+$/', $equation);
self::assertSame(1, $match, $equation);
$type = Trend::TREND_BEST_FIT_NO_POLY;
$result = Trend::calculate($type, $yValues, $xValues);